diff --git a/draft.tex b/draft.tex index d464684..a015198 100644 --- a/draft.tex +++ b/draft.tex @@ -290,7 +290,7 @@ $1.1\,\GeV^2 \leq q^2 \leq 8.0\,\GeV^2$ and $10.0\,\GeV^2 \leq q^2 \leq 13.0\,\GeV^2$. This definition of \qsq ranges are broadly consistent with published results, -and assumes improvements in the electron mode resolution for LHCb~\cite{Lionetto:XX}. +and assumes improvements in the electron mode resolution for LHCb~\cite{Lionetto:2624938}. Within the SM setup the Wilson coefficients are set to $\mathcal{C}^{\rm{SM}}_9 = 4.27$, $\mathcal{C}^{\rm{SM}}_{10} = - 4.17$ and $\mathcal{C}^{\rm{SM}}_7 = -0.34$ (see~\cite{Bobeth:2017vxj} and references therein), @@ -407,19 +407,22 @@ Experimental resolution and detector acceptance/efficiency effects are not considered in this work, as these would require further information from current (non-public) or planned \textit{B}-physics experiments. -Nevertheless, preliminary studies on the impact of a finite \qsq resolution are performed -assuming a \qsq-constant asymmetric smearing of the di-lepton invariant mass -in the electron mode; the size and asymmetry of such smearing is naively chosen -to reproduce the mass fits of Ref.~\cite{Aaij:2017vbb}. -Despite the low \qsq asymmetric tail, the determination of $\Delta\WC_9$ and -$\Delta\WC_{10}$ remains unbiased, even if no-correction is -applied. +Nevertheless, the precision on this measurement can remain unbiased +either by parametrising these effects in the amplitude model and/or even +re-computing the angles or the $q^2$ variables constraining the $B$ invariant mass~\cite{Lionetto:2624938}. +%Nevertheless, preliminary studies on the impact of a finite \qsq resolution are performed +%assuming a \qsq-constant asymmetric smearing of the di-lepton invariant mass +%in the electron mode; the size and asymmetry of such smearing is naively chosen +%to reproduce the mass fits of Ref.~\cite{Aaij:2017vbb}. +%Despite the low \qsq asymmetric tail, the determination of $\Delta\WC_9$ and +%$\Delta\WC_{10}$ remains unbiased, even if no-correction is +%applied. Moreover, the differential decay width can receive additional complex amplitudes from signal-like backgrounds, -\textit{e.g.} $K\pi$ S-wave from a non-resonant decay and/or a scalar resonance (see detailed discussion in Ref.~\cite{Hurth:2017hxg}). +\textit{e.g.} $K\pi$ S-wave from a non-resonant decay and/or a scalar resonance~\cite{Becirevic:2012dp}. These contributions are determined to be small~\cite{Aaij:2015oid,Aaij:2016flj}, -and in the proposed formalism they benefit from the same description between the muon and electron mode. -Therefore, in this constrained framework these effects are even further suppressed and can then be neglected -for the scope of this work. +and in the proposed formalism they benefit from the same description between the muon +and electron mode (see detailed discussion in Ref.~\cite{Chrzaszcz:2018yza}). +Therefore, such contribution does not dilute the expected sensitivity of the measurement. Another important test to probe the stability of the model consists in analysing potential issues that can rise if the truncation @@ -481,7 +484,7 @@ \end{figure} -We acknowledge useful contributions from Gino Isidori, Danny van Dyk and Patrick Owen. +We acknowledge useful contributions from Michele Atzeni, Gino Isidori, Danny van Dyk and Patrick Owen. This work is supported by the Swiss National Science Foundation (SNF) under contracts 173104 and 174182. diff --git a/prd/.DS_Store b/prd/.DS_Store new file mode 100644 index 0000000..e02794c --- /dev/null +++ b/prd/.DS_Store Binary files differ diff --git a/prd/SupplementalMaterial.zip b/prd/SupplementalMaterial.zip new file mode 100644 index 0000000..a193d1c --- /dev/null +++ b/prd/SupplementalMaterial.zip Binary files differ diff --git a/prd/SupplementalMaterial/.DS_Store b/prd/SupplementalMaterial/.DS_Store new file mode 100644 index 0000000..5008ddf --- /dev/null +++ b/prd/SupplementalMaterial/.DS_Store Binary files differ diff --git a/prd/SupplementalMaterial/ellipses_CpMu.pdf b/prd/SupplementalMaterial/ellipses_CpMu.pdf new file mode 100644 index 0000000..46ebca3 --- /dev/null +++ b/prd/SupplementalMaterial/ellipses_CpMu.pdf Binary files differ diff --git a/prd/SupplementalMaterial/ellipses_CpMu_Hz.pdf b/prd/SupplementalMaterial/ellipses_CpMu_Hz.pdf new file mode 100644 index 0000000..8a034e5 --- /dev/null +++ b/prd/SupplementalMaterial/ellipses_CpMu_Hz.pdf Binary files differ diff --git a/prd/SupplementalMaterial/suppl.tex b/prd/SupplementalMaterial/suppl.tex new file mode 100644 index 0000000..7d0a4cf --- /dev/null +++ b/prd/SupplementalMaterial/suppl.tex @@ -0,0 +1,181 @@ +% vim: set sts=4 et : +\documentclass[reprint,preprintnumbers,prd,nofootinbib]{revtex4-1} + +\usepackage{amsfonts} +\usepackage{amsmath} +\usepackage{array} +\usepackage{braket} +\usepackage{epstopdf} +\usepackage{graphicx} +\usepackage{hepparticles} +\usepackage{hepnicenames} +\usepackage{hepunits} +\usepackage{hyperref} +\usepackage[% + utf8 +]{inputenc} +\usepackage{slashed} +\usepackage{subfigure} +\usepackage{placeins} +\usepackage[% + normalem +]{ulem} +\usepackage[% + usenames, + svgnames, + dvipsnames +]{xcolor} + + +%% Shortcuts %% +\newcommand{\ie}{\textit{i.e.}} +\newcommand{\nuvec}{\vec{\nu}} +\newcommand{\refapp}[1]{appendix~\ref{app:#1}} +\newcommand{\refeq}[1]{eq.~(\ref{eq:#1})} +\newcommand{\refeqs}[2]{eqs.~(\ref{eq:#1})--(\ref{eq:#2})} +\newcommand{\reffig}[1]{figure~\ref{fig:#1}} +\newcommand{\refsec}[1]{section~\ref{sec:#1}} +\newcommand{\reftab}[1]{table~\ref{tab:#1}} +%\let\oldtheta\theta +%\renewcommand{\theta}{\vartheta} +\newcommand{\eps}{\varepsilon} +\newcommand{\para}{\parallel} +\newcommand{\Gfermi}{G_F} +%\newcommand{\dd}[2][]{{\mathrm{d}^{#1}}#2\,} +\newcommand{\dd}{\ensuremath{\textrm{d}}} +\newcommand{\order}[1]{\ensuremath{\mathcal{O}\left(#1\right)}} +\DeclareMathOperator{\sign}{sgn} +\DeclareMathOperator{\ReNew}{Re} +\DeclareMathOperator{\ImNew}{Im} +\let\Re\ReNew +\let\Im\ImNew +\DeclareMathOperator*{\sumint}{% +\mathchoice% + {\ooalign{$\displaystyle\sum$\cr\hidewidth$\displaystyle\int$\hidewidth\cr}} + {\ooalign{\raisebox{.14\height}{\scalebox{.7}{$\textstyle\sum$}}\cr\hidewidth$\textstyle\int$\hidewidth\cr}} + {\ooalign{\raisebox{.2\height}{\scalebox{.6}{$\scriptstyle\sum$}}\cr$\scriptstyle\int$\cr}} + {\ooalign{\raisebox{.2\height}{\scalebox{.6}{$\scriptstyle\sum$}}\cr$\scriptstyle\int$\cr}} +} +\DeclareMathOperator*{\argmax}{arg\,max} +\newcommand{\wilson}[2][]{\mathcal{C}^\text{#1}_{#2}} +\newcommand{\op}[1]{\mathcal{O}_{#1}} +\newcommand{\la}{\langle} +\newcommand{\ra}{\rangle} +\newcommand{\eqa}[1]{\begin{eqnarray} #1 \end{eqnarray}} + + +\def\deriv {\ensuremath{\mathrm{d}}} +\def\qsq {\ensuremath{q^2}\xspace} + +\def\PB {\ensuremath{\mathrm{B}}\xspace} +\def\B {{\ensuremath{\PB}}\xspace} +\def\PK {\ensuremath{\mathrm{K}}\xspace} +\def\kaon {{\ensuremath{\PK}}\xspace} +\def\Kstarz {{\ensuremath{\kaon^{*0}}}\xspace} +\def\Bd {{\ensuremath{\B^0}}\xspace} +\def\Bz {{\ensuremath{\B^0}}\xspace} + +%% Key decay channels + +\def\BdToKstmm {\decay{\Bd}{\Kstarz\mup\mun}} +\def\BdbToKstmm {\decay{\Bdb}{\Kstarzb\mup\mun}} + +\def\BsToJPsiPhi {\decay{\Bs}{\jpsi\phi}} +\def\BdToJPsiKst {\decay{\Bd}{\jpsi\Kstarz}} +\def\BdbToJPsiKst {\decay{\Bdb}{\jpsi\Kstarzb}} + +%% Rare decays +\def\BdKstee {\decay{\Bd}{\Kstarz\epem}} +\def\BdbKstee {\decay{\Bdb}{\Kstarzb\epem}} +\def\bsll {\decay{\bquark}{\squark \ell^+ \ell^-}} + +\def\lepton {{\ensuremath{\ell}}\xspace} +\def\ellm {{\ensuremath{\ell^-}}\xspace} +\def\ellp {{\ensuremath{\ell^+}}\xspace} +\def\ellell {\ensuremath{\ell^+ \ell^-}\xspace} +\def\mumu {{\ensuremath{\Pmu^+\Pmu^-}}\xspace} + +\def\lhcb {\mbox{LHCb}\xspace} +\def\belle {\mbox{Belle}\xspace} + +\def\WC {\ensuremath{\mathcal{C}}\xspace} + + + +\begin{document} + +\allowdisplaybreaks + +\preprint{ZU-TH-15/18} +\title{Supplemental material for ``Towards establishing Lepton Flavour Universality violation in $\bar{B}\to \bar{K}^*\ell^+\ell^-$ decays''} +\author{Andrea Mauri} +\email{a.mauri@cern.ch} +\author{Nicola Serra} +\email{nicola.serra@cern.ch} +\author{Rafael Silva Coutinho} +\email{rafael.silva.coutinho@cern.ch} +\affiliation{Physik-Institut, Universit\"at Z\"urich, Winterthurer Strasse 190, 8057 Z\"urich, Switzerland} + + +%\appendix + +%\section{Supplemental material} + + +\maketitle + +An extension of the physics case of the proposed method +is to investigate the sensitivity to the chirality-flipped counterparts of the usual Wilson coefficients, +\textit{i.e.} $\WC^{\prime (\mu)}_9$ and $\WC^{\prime(\mu)}_{10}$. +Following the formalism discussed in this letter, the primed WCs are examined by considering in addition to the +\texttt{BMP}$_{\WC_{9,10}}$ three different modified NP scenarios for the muon only: +$\WC_{9,10}^{\prime(\mu)} = \WC^{\prime \rm{SM}}_{9,10} = 0$; +$\WC^{\prime (\mu)}_9 = \WC^{\prime (\mu)}_{10} = 0.3$; +and $\WC^{\prime (\mu)}_9 = - \WC^{\prime (\mu)}_{10} = 0.3$. +Notice that for the electron mode the $\WC_{9,10}^{\prime(e)}$ is set and fixed to the SM value $\WC^{\prime \rm{SM}}_{9,10} = 0$. + + +Figure~\ref{fig:Cp_Hz} shows the fit results for different order of the analytic expansion for +the non-local hadronic contribution for a NP scenario with $\WC'^{(\mu)}_9 = \WC'^{(\mu)}_{10} = 0.3$ +% +\begin{figure}[h] +\includegraphics[width=.4\textwidth]{ellipses_CpMu_Hz.pdf} +\caption{% + Two-dimensional sensitivity scans for the pair of Wilson coefficients $\WC'^{(\mu)}_9$ and + $\WC'^{(\mu)}_{10}$ for different non-local hadronic parametrisation models for a NP scenario + with $\WC'^{(\mu)}_9 = \WC'^{(\mu)}_{10} = 0.3$. + The contours correspond to 99\% confidence level statistical-only uncertainty bands evaluated with + the expected statistics after \lhcb Run II. + \label{fig:Cp_Hz} +} +\end{figure} +% +and yields corresponding to the \lhcb Run II expected statistics. +The dependency on the determination of $\WC'^{(\mu)}_9$ and $\WC'^{(\mu)}_{10}$ on the +order of the expansion clearly saturates after $\mathcal{H}_\lambda[z^3]$ and allows a measurement +of the primed Wilson coefficients for the muon decay channel $B^{0} \to K^{*0} \mumu$ independent +on the theoretical hadronic uncertainty. +% +Figure~\ref{fig:Cp} shows the prospects for the sensitivity to the $\WC'^{(\mu)}_9$ and +$\WC'^{(\mu)}_{10}$ Wilson coefficients corresponding to the expected statistics at +the LHCb upgrade with $50\,$fb$^{-1}$ and $\,300\,$fb$^{-1}$. +Note that only with the full capability of the LHCb experiment it is possible +to start disentangling the different NP hypotheses. + + +% +\begin{figure}[b] +\includegraphics[width=.4\textwidth]{ellipses_CpMu.pdf} +\caption{% + Two-dimensional sensitivity scans for the pair of Wilson coefficients $\WC'^{(\mu)}_9$ and $\WC'^{(\mu)}_{10}$ + for three NP scenarios: (blue) $\WC'^{(\mu)}_9 = \WC'^{(\mu)}_{10} = 0$, (orange) $\WC'^{(\mu)}_9 = \WC'^{(\mu)}_{10} = 0.3$ + and (magenta) $\WC'^{(\mu)}_9 = - \WC'^{(\mu)}_{10} = 0.3$. + The contours correspond to 99\% confidence level statistical-only uncertainty bands expected for the LHCb Upgrade (dotted) + $50\,$fb$^{-1}$ and (solid) $\,300\,$fb$^{-1}$ statistics. + \label{fig:Cp} +} +\end{figure} + +%\FloatBarrier + +\end{document} diff --git a/prd/draft.pdf b/prd/draft.pdf new file mode 100644 index 0000000..4f00004 --- /dev/null +++ b/prd/draft.pdf Binary files differ diff --git a/prd/main.zip b/prd/main.zip new file mode 100644 index 0000000..d38b342 --- /dev/null +++ b/prd/main.zip Binary files differ diff --git a/prd/main/.DS_Store b/prd/main/.DS_Store new file mode 100644 index 0000000..5008ddf --- /dev/null +++ b/prd/main/.DS_Store Binary files differ diff --git a/prd/main/B2Kstll_summary.pdf b/prd/main/B2Kstll_summary.pdf new file mode 100644 index 0000000..58f805a --- /dev/null +++ b/prd/main/B2Kstll_summary.pdf Binary files differ diff --git a/prd/main/draft.bbl b/prd/main/draft.bbl new file mode 100644 index 0000000..cb6db10 --- /dev/null +++ b/prd/main/draft.bbl @@ -0,0 +1,680 @@ +%merlin.mbs apsrev4-1.bst 2010-07-25 4.21a (PWD, AO, DPC) hacked +%Control: key (0) +%Control: author (8) initials jnrlst +%Control: editor formatted (1) identically to author +%Control: production of article title (-1) disabled +%Control: page (0) single +%Control: year (1) truncated +%Control: production of eprint (0) enabled +\begin{thebibliography}{51}% +\makeatletter +\providecommand \@ifxundefined [1]{% + \@ifx{#1\undefined} +}% +\providecommand \@ifnum [1]{% + \ifnum #1\expandafter \@firstoftwo + \else \expandafter \@secondoftwo + \fi +}% +\providecommand \@ifx [1]{% + \ifx #1\expandafter \@firstoftwo + \else \expandafter \@secondoftwo + \fi +}% +\providecommand \natexlab [1]{#1}% +\providecommand \enquote [1]{``#1''}% +\providecommand \bibnamefont [1]{#1}% +\providecommand \bibfnamefont [1]{#1}% +\providecommand \citenamefont [1]{#1}% +\providecommand \href@noop [0]{\@secondoftwo}% +\providecommand \href [0]{\begingroup \@sanitize@url \@href}% +\providecommand \@href[1]{\@@startlink{#1}\@@href}% +\providecommand \@@href[1]{\endgroup#1\@@endlink}% +\providecommand \@sanitize@url [0]{\catcode `\\12\catcode `\$12\catcode + `\&12\catcode 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{author} {\bibfnamefont {C.~G.}\ \bibnamefont + {Boyd}}, \bibinfo {author} {\bibfnamefont {B.}~\bibnamefont {Grinstein}}, \ + and\ \bibinfo {author} {\bibfnamefont {R.~F.}\ \bibnamefont {Lebed}},\ }\href + {\doibase 10.1016/0370-2693(95)00480-9} {\bibfield {journal} {\bibinfo + {journal} {Phys. Lett.}\ }\textbf {\bibinfo {volume} {B353}},\ \bibinfo + {pages} {306} (\bibinfo {year} {1995})},\ \Eprint + {http://arxiv.org/abs/hep-ph/9504235} {arXiv:hep-ph/9504235 [hep-ph]} + \BibitemShut {NoStop}% +%%CITATION = HEP-PH/9504235;%% +\bibitem [{\citenamefont {Bourrely}\ \emph {et~al.}(2009)\citenamefont + {Bourrely}, \citenamefont {Caprini},\ and\ \citenamefont + {Lellouch}}]{Bourrely:2008za}% + \BibitemOpen + \bibfield {author} {\bibinfo {author} {\bibfnamefont {C.}~\bibnamefont + {Bourrely}}, \bibinfo {author} {\bibfnamefont {I.}~\bibnamefont {Caprini}}, \ + and\ \bibinfo {author} {\bibfnamefont {L.}~\bibnamefont {Lellouch}},\ }\href + {\doibase 10.1103/PhysRevD.82.099902, 10.1103/PhysRevD.79.013008} {\bibfield + {journal} {\bibinfo {journal} {Phys. Rev.}\ }\textbf {\bibinfo {volume} + {D79}},\ \bibinfo {pages} {013008} (\bibinfo {year} {2009})},\ \bibinfo + {note} {[Erratum: Phys. Rev.D82,099902(2010)]},\ \Eprint + {http://arxiv.org/abs/0807.2722} {arXiv:0807.2722 [hep-ph]} \BibitemShut + {NoStop}% +%%CITATION = ARXIV:0807.2722;%% +\bibitem [{\citenamefont {Chrzaszcz}\ \emph {et~al.}(2018)\citenamefont + {Chrzaszcz}, \citenamefont {Mauri}, \citenamefont {Serra}, \citenamefont + {Silva~Coutinho},\ and\ \citenamefont {van Dyk}}]{Chrzaszcz:2018yza}% + \BibitemOpen + \bibfield {author} {\bibinfo {author} {\bibfnamefont {M.}~\bibnamefont + {Chrzaszcz}}, \bibinfo {author} {\bibfnamefont {A.}~\bibnamefont {Mauri}}, + \bibinfo {author} {\bibfnamefont {N.}~\bibnamefont {Serra}}, \bibinfo + {author} {\bibfnamefont {R.}~\bibnamefont {Silva~Coutinho}}, \ and\ \bibinfo + {author} {\bibfnamefont {D.}~\bibnamefont {van Dyk}},\ }\href@noop {} {\ + (\bibinfo {year} {2018})},\ \Eprint {http://arxiv.org/abs/1805.06378} + {arXiv:1805.06378 [hep-ph]} \BibitemShut {NoStop}% +%%CITATION = ARXIV:1805.06378;%% +\bibitem [{\citenamefont {Paul}\ and\ \citenamefont + {Straub}(2017)}]{Paul:2016urs}% + \BibitemOpen + \bibfield {author} {\bibinfo {author} {\bibfnamefont {A.}~\bibnamefont + {Paul}}\ and\ \bibinfo {author} {\bibfnamefont {D.~M.}\ \bibnamefont + {Straub}},\ }\href {\doibase 10.1007/JHEP04(2017)027} {\bibfield {journal} + {\bibinfo {journal} {JHEP}\ }\textbf {\bibinfo {volume} {04}},\ \bibinfo + {pages} {027} (\bibinfo {year} {2017})},\ \Eprint + {http://arxiv.org/abs/1608.02556} {arXiv:1608.02556 [hep-ph]} \BibitemShut + {NoStop}% +%%CITATION = ARXIV:1608.02556;%% +\bibitem [{sup()}]{suppl}% + \BibitemOpen + \href@noop {} {\enquote {\bibinfo {title} {{See Supplemental Material at [URL + will be inserted by publisher] for sensitivity studies on the determination + of the Wilson coefficients $\mathcal{C}_9^{\prime\,(\mu)}$ and + $\mathcal{C}{10}^{\prime\,(\mu)}$}},}\ }\BibitemShut {NoStop}% +\bibitem [{\citenamefont {Aaij}\ \emph + {et~al.}(2017{\natexlab{b}})\citenamefont {Aaij} \emph + {et~al.}}]{Aaij:2244311}% + \BibitemOpen + \bibfield {author} {\bibinfo {author} {\bibfnamefont {R.}~\bibnamefont + {Aaij}} \emph {et~al.} (\bibinfo {collaboration} {LHCb Collaboration}),\ + }\href {http://cds.cern.ch/record/2244311} {\emph {\bibinfo {title} + {{Expression of Interest for a Phase-II LHCb Upgrade: Opportunities in + flavour physics, and beyond, in the HL-LHC era}}}},\ \bibinfo {type} {Tech. + Rep.}\ \bibinfo {number} {CERN-LHCC-2017-003}\ (\bibinfo {institution} + {CERN},\ \bibinfo {address} {Geneva},\ \bibinfo {year} {2017})\BibitemShut + {NoStop}% +\bibitem [{\citenamefont {Lionetto}\ \emph {et~al.}(2018)\citenamefont + {Lionetto}, \citenamefont {Serra}, \citenamefont {Steinkamp},\ and\ + \citenamefont {Mueller}}]{Lionetto:2624938}% + \BibitemOpen + \bibfield {author} {\bibinfo {author} {\bibfnamefont {F.}~\bibnamefont + {Lionetto}}, \bibinfo {author} {\bibfnamefont {N.}~\bibnamefont {Serra}}, + \bibinfo {author} {\bibfnamefont {O.}~\bibnamefont {Steinkamp}}, \ and\ + \bibinfo {author} {\bibfnamefont {K.}~\bibnamefont {Mueller}},\ }\href + {https://cds.cern.ch/record/2624938} {\enquote {\bibinfo {title} + {{Measurements of Angular Observables of $B^0\to K^{*0} \mu^+ \mu^-$ and $B^0 + \to K^{*0} e^+ e^-$ Decays and the Upgrade of LHCb}},}\ }\bibinfo + {howpublished} {\url{https://cds.cern.ch/record/2624938}} (\bibinfo {year} + {2018}),\ \bibinfo {note} {presented 22 Mar 2018}\BibitemShut {NoStop}% +\bibitem [{\citenamefont {Bharucha}\ \emph {et~al.}(2016)\citenamefont + {Bharucha}, \citenamefont {Straub},\ and\ \citenamefont + {Zwicky}}]{Straub:2015ica}% + \BibitemOpen + \bibfield {author} {\bibinfo {author} {\bibfnamefont {A.}~\bibnamefont + {Bharucha}}, \bibinfo {author} {\bibfnamefont {D.~M.}\ \bibnamefont + {Straub}}, \ and\ \bibinfo {author} {\bibfnamefont {R.}~\bibnamefont + {Zwicky}},\ }\href {\doibase 10.1007/JHEP08(2016)098} {\bibfield {journal} + {\bibinfo {journal} {JHEP}\ }\textbf {\bibinfo {volume} {08}},\ \bibinfo + {pages} {098} (\bibinfo {year} {2016})},\ \Eprint + {http://arxiv.org/abs/1503.05534} {arXiv:1503.05534 [hep-ph]} \BibitemShut + {NoStop}% +%%CITATION = ARXIV:1503.05534;%% +\bibitem [{\citenamefont {Ball}\ and\ \citenamefont + {Braun}(1998)}]{Ball:1998kk}% + \BibitemOpen + \bibfield {author} {\bibinfo {author} {\bibfnamefont {P.}~\bibnamefont + {Ball}}\ and\ \bibinfo {author} {\bibfnamefont {V.~M.}\ \bibnamefont + {Braun}},\ }\href {\doibase 10.1103/PhysRevD.58.094016} {\bibfield {journal} + {\bibinfo {journal} {Phys. Rev.}\ }\textbf {\bibinfo {volume} {D58}},\ + \bibinfo {pages} {094016} (\bibinfo {year} {1998})},\ \Eprint + {http://arxiv.org/abs/hep-ph/9805422} {arXiv:hep-ph/9805422 [hep-ph]} + \BibitemShut {NoStop}% +%%CITATION = HEP-PH/9805422;%% +\bibitem [{\citenamefont {Khodjamirian}\ \emph {et~al.}(2007)\citenamefont + {Khodjamirian}, \citenamefont {Mannel},\ and\ \citenamefont + {Offen}}]{Khodjamirian:2006st}% + \BibitemOpen + \bibfield {author} {\bibinfo {author} {\bibfnamefont {A.}~\bibnamefont + {Khodjamirian}}, \bibinfo {author} {\bibfnamefont {T.}~\bibnamefont + {Mannel}}, \ and\ \bibinfo {author} {\bibfnamefont {N.}~\bibnamefont + {Offen}},\ }\href {\doibase 10.1103/PhysRevD.75.054013} {\bibfield {journal} + {\bibinfo {journal} {Phys. Rev.}\ }\textbf {\bibinfo {volume} {D75}},\ + \bibinfo {pages} {054013} (\bibinfo {year} {2007})},\ \Eprint + {http://arxiv.org/abs/hep-ph/0611193} {arXiv:hep-ph/0611193 [hep-ph]} + \BibitemShut {NoStop}% +%%CITATION = HEP-PH/0611193;%% +\bibitem [{\citenamefont {Becirevic}\ \emph {et~al.}(2007)\citenamefont + {Becirevic}, \citenamefont {Lubicz},\ and\ \citenamefont + {Mescia}}]{Becirevic:2006nm}% + \BibitemOpen + \bibfield {author} {\bibinfo {author} {\bibfnamefont {D.}~\bibnamefont + {Becirevic}}, \bibinfo {author} {\bibfnamefont {V.}~\bibnamefont {Lubicz}}, \ + and\ \bibinfo {author} {\bibfnamefont {F.}~\bibnamefont {Mescia}},\ }\href + {\doibase 10.1016/j.nuclphysb.2007.01.032} {\bibfield {journal} {\bibinfo + {journal} {Nucl. Phys.}\ }\textbf {\bibinfo {volume} {B769}},\ \bibinfo + {pages} {31} (\bibinfo {year} {2007})},\ \Eprint + {http://arxiv.org/abs/hep-ph/0611295} {arXiv:hep-ph/0611295 [hep-ph]} + \BibitemShut {NoStop}% +%%CITATION = HEP-PH/0611295;%% +\bibitem [{\citenamefont {Horgan}\ \emph {et~al.}(2014)\citenamefont {Horgan}, + \citenamefont {Liu}, \citenamefont {Meinel},\ and\ \citenamefont + {Wingate}}]{Horgan:2013hoa}% + \BibitemOpen + \bibfield {author} {\bibinfo {author} {\bibfnamefont {R.~R.}\ \bibnamefont + {Horgan}}, \bibinfo {author} {\bibfnamefont {Z.}~\bibnamefont {Liu}}, + \bibinfo {author} {\bibfnamefont {S.}~\bibnamefont {Meinel}}, \ and\ \bibinfo + {author} {\bibfnamefont {M.}~\bibnamefont {Wingate}},\ }\href {\doibase + 10.1103/PhysRevD.89.094501} {\bibfield {journal} {\bibinfo {journal} {Phys. + Rev.}\ }\textbf {\bibinfo {volume} {D89}},\ \bibinfo {pages} {094501} + (\bibinfo {year} {2014})},\ \Eprint {http://arxiv.org/abs/1310.3722} + {arXiv:1310.3722 [hep-lat]} \BibitemShut {NoStop}% +%%CITATION = ARXIV:1310.3722;%% +\bibitem [{\citenamefont {Capdevila}\ \emph {et~al.}(2017)\citenamefont + {Capdevila}, \citenamefont {Descotes-Genon}, \citenamefont {Hofer},\ and\ + \citenamefont {Matias}}]{Capdevila:2017ert}% + \BibitemOpen + \bibfield {author} {\bibinfo {author} {\bibfnamefont {B.}~\bibnamefont + {Capdevila}}, \bibinfo {author} {\bibfnamefont {S.}~\bibnamefont + {Descotes-Genon}}, \bibinfo {author} {\bibfnamefont {L.}~\bibnamefont + {Hofer}}, \ and\ \bibinfo {author} {\bibfnamefont {J.}~\bibnamefont + {Matias}},\ }\href {\doibase 10.1007/JHEP04(2017)016} {\bibfield {journal} + {\bibinfo {journal} {JHEP}\ }\textbf {\bibinfo {volume} {04}},\ \bibinfo + {pages} {016} (\bibinfo {year} {2017})},\ \Eprint + {http://arxiv.org/abs/1701.08672} {arXiv:1701.08672 [hep-ph]} \BibitemShut + {NoStop}% +%%CITATION = ARXIV:1701.08672;%% +\bibitem [{\citenamefont {Albrecht}\ \emph {et~al.}(2017)\citenamefont + {Albrecht}, \citenamefont {Bernlochner}, \citenamefont {Kenzie}, + \citenamefont {Reichert}, \citenamefont {Straub},\ and\ \citenamefont + {Tully}}]{Albrecht:2017odf}% + \BibitemOpen + \bibfield {author} {\bibinfo {author} {\bibfnamefont {J.}~\bibnamefont + {Albrecht}}, \bibinfo {author} {\bibfnamefont {F.}~\bibnamefont + {Bernlochner}}, \bibinfo {author} {\bibfnamefont {M.}~\bibnamefont {Kenzie}}, + \bibinfo {author} {\bibfnamefont {S.}~\bibnamefont {Reichert}}, \bibinfo + {author} {\bibfnamefont {D.}~\bibnamefont {Straub}}, \ and\ \bibinfo {author} + {\bibfnamefont {A.}~\bibnamefont {Tully}},\ }\href@noop {} {\ (\bibinfo + {year} {2017})},\ \Eprint {http://arxiv.org/abs/1709.10308} {arXiv:1709.10308 + [hep-ph]} \BibitemShut {NoStop}% +%%CITATION = ARXIV:1709.10308;%% +\bibitem [{\citenamefont {Becirevic}\ and\ \citenamefont + {Tayduganov}(2013)}]{Becirevic:2012dp}% + \BibitemOpen + \bibfield {author} {\bibinfo {author} {\bibfnamefont {D.}~\bibnamefont + {Becirevic}}\ and\ \bibinfo {author} {\bibfnamefont {A.}~\bibnamefont + {Tayduganov}},\ }\href {\doibase 10.1016/j.nuclphysb.2012.11.016} {\bibfield + {journal} {\bibinfo {journal} {Nucl. Phys.}\ }\textbf {\bibinfo {volume} + {B868}},\ \bibinfo {pages} {368} (\bibinfo {year} {2013})},\ \Eprint + {http://arxiv.org/abs/1207.4004} {arXiv:1207.4004 [hep-ph]} \BibitemShut + {NoStop}% +%%CITATION = ARXIV:1207.4004;%% +\bibitem [{\citenamefont {Aaij}\ \emph + {et~al.}(2016{\natexlab{b}})\citenamefont {Aaij} \emph + {et~al.}}]{Aaij:2016flj}% + \BibitemOpen + \bibfield {author} {\bibinfo {author} {\bibfnamefont {R.}~\bibnamefont + {Aaij}} \emph {et~al.} (\bibinfo {collaboration} {LHCb}),\ }\href {\doibase + 10.1007/JHEP11(2016)047, 10.1007/JHEP04(2017)142} {\bibfield {journal} + {\bibinfo {journal} {JHEP}\ }\textbf {\bibinfo {volume} {11}},\ \bibinfo + {pages} {047} (\bibinfo {year} {2016}{\natexlab{b}})},\ \bibinfo {note} + {[Erratum: JHEP04,142(2017)]},\ \Eprint {http://arxiv.org/abs/1606.04731} + {arXiv:1606.04731 [hep-ex]} \BibitemShut {NoStop}% +%%CITATION = ARXIV:1606.04731;%% +\end{thebibliography}% diff --git a/prd/main/draft.tex b/prd/main/draft.tex new file mode 100644 index 0000000..c0e48fb --- /dev/null +++ b/prd/main/draft.tex @@ -0,0 +1,495 @@ +% vim: set sts=4 et : +\documentclass[reprint,preprintnumbers,prd,nofootinbib]{revtex4-1} + +\usepackage{amsfonts} +\usepackage{amsmath} +\usepackage{array} +\usepackage{braket} +\usepackage{epstopdf} +\usepackage{graphicx} +\usepackage{hepparticles} +\usepackage{hepnicenames} +\usepackage{hepunits} +\usepackage{hyperref} +\usepackage[% + utf8 +]{inputenc} +\usepackage{slashed} +\usepackage{subfigure} +\usepackage{placeins} +\usepackage[% + normalem +]{ulem} +\usepackage[% + usenames, + svgnames, + dvipsnames +]{xcolor} + + +%% Shortcuts %% +\newcommand{\ie}{\textit{i.e.}} +\newcommand{\nuvec}{\vec{\nu}} +\newcommand{\refapp}[1]{appendix~\ref{app:#1}} +\newcommand{\refeq}[1]{eq.~(\ref{eq:#1})} +\newcommand{\refeqs}[2]{eqs.~(\ref{eq:#1})--(\ref{eq:#2})} +\newcommand{\reffig}[1]{figure~\ref{fig:#1}} +\newcommand{\refsec}[1]{section~\ref{sec:#1}} +\newcommand{\reftab}[1]{table~\ref{tab:#1}} +%\let\oldtheta\theta +%\renewcommand{\theta}{\vartheta} +\newcommand{\eps}{\varepsilon} +\newcommand{\para}{\parallel} +\newcommand{\Gfermi}{G_F} +%\newcommand{\dd}[2][]{{\mathrm{d}^{#1}}#2\,} +\newcommand{\dd}{\ensuremath{\textrm{d}}} +\newcommand{\order}[1]{\ensuremath{\mathcal{O}\left(#1\right)}} +\DeclareMathOperator{\sign}{sgn} +\DeclareMathOperator{\ReNew}{Re} +\DeclareMathOperator{\ImNew}{Im} +\let\Re\ReNew +\let\Im\ImNew +\DeclareMathOperator*{\sumint}{% +\mathchoice% + {\ooalign{$\displaystyle\sum$\cr\hidewidth$\displaystyle\int$\hidewidth\cr}} + {\ooalign{\raisebox{.14\height}{\scalebox{.7}{$\textstyle\sum$}}\cr\hidewidth$\textstyle\int$\hidewidth\cr}} + {\ooalign{\raisebox{.2\height}{\scalebox{.6}{$\scriptstyle\sum$}}\cr$\scriptstyle\int$\cr}} + {\ooalign{\raisebox{.2\height}{\scalebox{.6}{$\scriptstyle\sum$}}\cr$\scriptstyle\int$\cr}} +} +\DeclareMathOperator*{\argmax}{arg\,max} +\newcommand{\wilson}[2][]{\mathcal{C}^\text{#1}_{#2}} +\newcommand{\op}[1]{\mathcal{O}_{#1}} +\newcommand{\la}{\langle} +\newcommand{\ra}{\rangle} +\newcommand{\eqa}[1]{\begin{eqnarray} #1 \end{eqnarray}} + + +\def\deriv {\ensuremath{\mathrm{d}}} +\def\qsq {\ensuremath{q^2}\xspace} + +\def\PB {\ensuremath{\mathrm{B}}\xspace} +\def\B {{\ensuremath{\PB}}\xspace} +\def\PK {\ensuremath{\mathrm{K}}\xspace} +\def\kaon {{\ensuremath{\PK}}\xspace} +\def\Kstarz {{\ensuremath{\kaon^{*0}}}\xspace} +\def\Bd {{\ensuremath{\B^0}}\xspace} +\def\Bz {{\ensuremath{\B^0}}\xspace} + +%% Key decay channels + +\def\BdToKstmm {\decay{\Bd}{\Kstarz\mup\mun}} +\def\BdbToKstmm {\decay{\Bdb}{\Kstarzb\mup\mun}} + +\def\BsToJPsiPhi {\decay{\Bs}{\jpsi\phi}} +\def\BdToJPsiKst {\decay{\Bd}{\jpsi\Kstarz}} +\def\BdbToJPsiKst {\decay{\Bdb}{\jpsi\Kstarzb}} + +%% Rare decays +\def\BdKstee {\decay{\Bd}{\Kstarz\epem}} +\def\BdbKstee {\decay{\Bdb}{\Kstarzb\epem}} +\def\bsll {\decay{\bquark}{\squark \ell^+ \ell^-}} + +\def\lepton {{\ensuremath{\ell}}\xspace} +\def\ellm {{\ensuremath{\ell^-}}\xspace} +\def\ellp {{\ensuremath{\ell^+}}\xspace} +\def\ellell {\ensuremath{\ell^+ \ell^-}\xspace} +\def\mumu {{\ensuremath{\Pmu^+\Pmu^-}}\xspace} + +\def\lhcb {\mbox{LHCb}\xspace} +\def\belle {\mbox{Belle}\xspace} + +\def\WC {\ensuremath{\mathcal{C}}\xspace} + + + +\begin{document} + +\allowdisplaybreaks + +\preprint{ZU-TH-15/18} +\title{Towards establishing Lepton Flavour Universality violation in $\bar{B}\to \bar{K}^*\ell^+\ell^-$ decays} +\author{Andrea Mauri} +\email{a.mauri@cern.ch} +\author{Nicola Serra} +\email{nicola.serra@cern.ch} +\author{Rafael Silva Coutinho} +\email{rafael.silva.coutinho@cern.ch} +\affiliation{Physik-Institut, Universit\"at Z\"urich, Winterthurer Strasse 190, 8057 Z\"urich, Switzerland} + +\begin{abstract} + Rare semileptonic $b \to s \ell^+ \ell^-$ transitions provide some of the most promising framework to search for new physics effects. +Recent analyses of these decays have indicated an anomalous behaviour in measurements + of angular distributions of the decay $B^0\to + K^*\mu^+\mu^-$ and lepton-flavour-universality observables. +Unambiguously establishing if these deviations have a common nature + is of paramount importance in order to understand the observed pattern. + We propose a novel approach to independently and complementary + probe this hypothesis + by performing a simultaneous amplitude analysis of $\bar{B}^0 \to \bar{K}^{*0} \mu^+\mu^-$ and $\bar{B}^0 \to \bar{K}^{*0} e^+e^-$ decays. + This method enables the direct determination of + observables that encode potential non-equal couplings of muons and electrons, + and are found to be insensitive to non-perturbative QCD effects. +If current hints of new physics are confirmed, our approach could +allow an early discovery of physics beyond the Standard +Model with LHCb Run-II datasets. +\end{abstract} + +\maketitle + +Flavour changing neutral current processes of {\textit{B}} meson decays +are crucial probes for the Standard Model (SM), +since as-yet undiscovered particles may contribute to these transitions and cause observables to deviate +from their SM predictions~\cite{Grossman:1996ke,Fleischer:1996bv,London:1997zk,Ciuchini:1997zp}. +The decay mode $\bar{B}\to \bar{K}^*\ell^+\ell^-$ is a prime example (\textit{i.e.} $\ell = \mu, e$), +which offers a rich framework to study from differential decay widths to angular observables. +An anomalous behaviour in angular and branching fraction analyses of the decay channel +$\bar{B}^{0} \to \bar{K}^{*0} \mu^{+}\mu^{-}$ has been recently reported~\cite{Aaij:2015oid,Wehle:2016yoi,Aaij:2013aln,Aaij:2014pli}, +notably in one of the observables with reduced theoretical uncertainties, +$P^{\prime}_{5}$~\cite{Aaij:2013qta,Descotes-Genon:2015uva}. +Several models have been suggested in order to interpret these results as new physics (NP) +signatures~\cite{Gauld:2013qja,Buras:2013qja,Altmannshofer:2013foa,Crivellin:2015era,Hiller:2014yaa,Biswas:2014gga,Gripaios:2014tna}. +Nonetheless, the vector-like nature of this pattern could be also explained by +non-perturbative QCD contributions from $b\to s c{\bar{c}}$ operators ({\textit{i.e.}} charm loops) +that are able to either mimic or camouflage NP effects~\cite{Jager:2012uw,Jager:2014rwa,Ciuchini:2015qxb}. +Non-standard measurement in ratios of $b \to s \ell^+ \ell^-$ processes +- such as of $R_{K}$~\cite{Aaij:2014ora} and $R_{K^{*}}$~\cite{Aaij:2017vbb} - +indicate a suppression of the muon channel which is also compatible with the $P^{\prime}_{5}$ anomaly. +In this case an immediate interpretation of lepton flavour universality (LFU) breaking is +suggested due to the small theoretical uncertainties in their predictions~\cite{Hiller:2003js,Bordone:2016gaq}. +Whilst the individual level of significance of the present anomalies is still inconclusive, +there is an appealing non-trivial consistent pattern shown in +global analysis fits~\cite{Capdevila:2017bsm,Altmannshofer:2017yso,Hurth:2017hxg,Ciuchini:2017mik,Alok:2017sui}. + +The formalism of {\textit{b}} decays is commonly described within +an effective field theory~\cite{Altmannshofer:2008dz}, +which probes distinct energy scales; +with regimes classified into short-distance (high energies) perturbative +and non-calculable long-distance effects. +These can be parametrised in the weak Lagrangian in terms of +effective operators with different Lorentz structures, $\mathcal{O}_i$, +with corresponding couplings $\mathcal{C}_i$ - referred to as Wilson coefficients (WC). +Only a subset of the operators that are most sensitive to NP is examined in this work~\cite{Bobeth:2017vxj}, +\textit{i.e.} $\mathcal{O}_7$ (virtual photon exchanges), $\mathcal{O}_{9,10}$ (vector and axial currents) +and corresponding right-handed couplings with flipped helicities. +In this framework NP effects are incorporated +by introducing deviations in the WCs~\cite{Ali:1994bf} from their SM predictions, +{\textit{i.e.}} $\mathcal{C}_i = \mathcal{C}^{\mathrm{SM}}_i + \mathcal{C}^{\mathrm{NP}}_i$. +For instance, the anomalous pattern seen in semileptonic decays can be +explained by a shift in the coefficient $\mathcal{C}_9$ only, +or $\mathcal{C}_9$ and $\mathcal{C}_{10}$ simultaneously~\cite{Capdevila:2017bsm,Altmannshofer:2017yso,Hurth:2017hxg}. +A direct experimental determination of the WCs is currently +bounded by sizeable uncertainties that arise from +non-factorisable hadronic matrix elements that are difficult to assess reliably from first principles. +Some promising approaches suggest to extract this contribution +from data-driven analyses~\cite{Blake:2017fyh,Hurth:2017sqw} +and by exploiting analytical properties of its structure~\cite{Bobeth:2017vxj}. +However, these models still have intrinsic limitations, in particular +in the assumptions that enter in parametrisation of the di-lepton invariant mass distribution. + +In this Letter we propose a new \textit{model-independent} approach that +from a simultaneous unbinned amplitude analysis of both +$\bar{B}^0 \to \bar{K}^{*0} \mu^+\mu^-$ and $\bar{B}^0 \to \bar{K}^{*0} e^+e^-$ decays +can, for the first time, unambiguously determine LFU-breaking from direct measurements of WCs. +This work builds on the generalisation of Ref.~\cite{Bobeth:2017vxj}, +but it is insensitive to the model assumptions of the parametrisation. +This effect relies on the strong correlation between the muon and electron modes +imposed by the lepton-flavour universality of the hadronic matrix elements. +Furthermore, in this method the full set of observables +(\textit{e.g} $R_{K^{*}}$, $P^{\prime}_{5}$ and branching fraction measurements) available in $\bar{B}\to \bar{K}^*\ell^+\ell^-$ +decays is exploited, providing unprecedented precision on LFU in a single analysis. + +Consider the differential decay rate for $\bar{B}\to \bar{K}^*\ell^+\ell^-$ +decays (dominated by the on-shell $\bar{K}^{*0}$ contribution) +fully described by four kinematic variables; +the di-lepton squared invariant mass, $q^2$, and the three angles +$\vec{\Omega} = (\cos \theta_\ell, \cos \theta_K, \phi)$~\cite{Altmannshofer:2008dz}. +The probability density function ($p.d.f.$) for this decay can be written as +% +\begin{equation} +p.d.f. = \frac{1}{\Gamma} \frac{\dd^4 \Gamma}{\dd q^2 \dd^3 \Omega}, \ + \quad + \text{with}\quad + \Gamma = \int_{q^2} \dd q^2 \frac{\dd\Gamma}{\dd q^2}\,, +\end{equation} +% +with different \qsq intervals depending on the lepton flavour under study. +For a complete definition of $\dd ^4\Gamma/(\dd q^2 \dd ^3\Omega)$ we refer +to~\cite{Bobeth:2008ij,Altmannshofer:2008dz} and references therein. +It is convenient to explicitly write the WC dependence on the decay width by +the transversity amplitudes ($\lambda=\perp, \para,0$) as~\cite{Bobeth:2017vxj} +% +\eqa{ + \label{eq:amp_dep} + {\cal{A}}_{\lambda}^{(\ell)\,L,R} &=& {\cal{N}}_{\lambda}^{(\ell)}\ \bigg\{ +(C^{(\ell)}_9 \mp C^{(\ell)}_{10}) {\cal{F}}_{\lambda}(q^2) \\ +% +&&+\frac{2m_b M_B}{q^2} \bigg[ C^{(\ell)}_7 {\cal{F}}_{\lambda}^{T}(q^2) - 16\pi^2 \frac{M_B}{m_b} {\cal{H}}_{\lambda}(q^2) \bigg] +\bigg\}\,,\nonumber +} +where ${\cal{N}}_{\lambda}^{(\ell)}$ is a normalisation factor, and +${\cal{F}}^{(T)}_{\lambda}(q^{2})$ and $\mathcal{H}_\lambda(q^{2})$ +are referred to ``local'' and ``non-local'' hadronic matrix elements, respectively. +The ${\cal{F}}^{(T)}_{\lambda}(q^{2})$ are form factors, +while $\mathcal{H}_\lambda(q^{2})$ encode the aforementioned non-factorisable +hadronic contributions and +are described using two complementary parametrisations~\cite{Bobeth:2017vxj,Hurth:2017sqw} - +for brevity only a subset of results is shown for the latter approach. +In the following +this function is expressed in terms of a ``conformal'' +variable $z(q^{2})$~\cite{Bobeth:2017vxj,Boyd:1995cf,Bourrely:2008za}, +with an analytical expansion truncated at a given order +$z^n$ (herein referred to as $\mathcal{H}_\lambda[z^n]$), +after removing singularities related to the $J/\psi(1S)$ and $\psi(2S)$. +Some of the drawbacks of this expansion is that \textit{a-priori} there is +no physics argument to justify the order of the polynomial to be curtailed at - +%or even if this series will ever converge - +which in turn currently limits any claim on NP sensitivity. + +In order to overcome these points, we investigate the LFU-breaking +hypothesis using direct determinations of the difference of Wilson coefficients +between muons and electrons, \textit{i.e.} +\begin{equation} +\Delta \WC_i = \widetilde{\mathcal{C}}_i^{(\mu)} - \widetilde{\mathcal{C}}_i^{(e)}\,, +\end{equation} +where the usual WCs $\mathcal{C}_i^{(\mu,e)}$ are renamed as $\widetilde{\mathcal{C}}_i^{(\mu,e)}$, +since an accurate disentanglement between the physical +meaning of $\WC_i^{(\mu,e)}$ and the above-mentioned hadronic pollution +cannot be achieved at the current stage of the theory~\cite{Chrzaszcz:2018yza}. +The key feature of this strategy is to realise that all hadronic matrix elements +are known to be lepton-flavour universal, and thus are shared among both semileptonic decays. +This benefits from the large statistics available for $\bar{B}^0 \to \bar{K}^{*0} \mu^+\mu^-$ decays +that is sufficient to enable the determination of these multi-space parameters. +Note that an amplitude analysis of the electron mode only has been previously disregarded, +given the limited dataset in either LHCb or Belle experiments. +In a common framework the hadronic contributions are treated as +nuisance parameters, while only the Wilson coefficients $\widetilde{\WC}_9^{(\mu,e)}$ +and $\widetilde{\WC}_{10}^{(\mu,e)}$ are kept separately for the two channels. +For consistency the WC $\widetilde{C}_{7}$ is also shared in the fit +and fixed to its SM value, given its universal coupling to photons +and the strong constraint from radiative $B$ decays~\cite{Paul:2016urs}. +In the following, all the right-handed WCs are fixed to their SM values, \textit{i.e.} $\WC_i^{\prime\,(\mu,e)} = 0$, +while sensitivity studies on the determination of the WCs $\WC_9^{\prime\,(\mu)}$ and $\WC_{10}^{\prime\,(\mu)}$ +are detailed in the supplemental material to this Letter~\cite{suppl}. + +Signal-only ensembles of pseudo-experiments are generated with +sample size corresponding roughly to the yields foreseen in LHCb Run-II [$8\,$fb$^{-1}$] and future upgrades +[$50\,$-$\,300\,$fb$^{-1}$]~\cite{Aaij:2244311}, and Belle II [$50\,$ab$^{-1}$]. +These are extrapolated from Refs.~\cite{Aaij:2015oid,Aaij:2017vbb,Wehle:2016yoi} +by scaling respectively with luminosity and $\sigma_{b\bar{b}} \propto \sqrt{s}$ +for LHCb, where $s$ denotes the designed centre-of-mass energy of the $b$-quark pair, +and exclusively with luminosity for Belle II. +%by scaling respectively with $\sigma_{b\bar{b}} \propto \sqrt{s}$ and $\sigma_{b\bar{b}} \propto s$ +%for LHCb and Belle II, where $s$ denotes the designed centre-of-mass +%energy of the $b$-quark pair. +Note that for brevity most of the results are shown for the representative +scenario of LHCb Run-II. +The studied \qsq range corresponds to +$1.1\,\GeV^2 \leq q^2 \leq 8.0\,\GeV^2$ and $11.0\,\GeV^2 \leq q^2 \leq 12.5\,\GeV^2$ for +the muon mode and $1.1\,\GeV^2 \leq q^2 \leq 7.0\,\GeV^2$ for the electron mode in LHCb; +while in Belle II the same kinematic regions are considered for both semileptonic channels, namely +$1.1\,\GeV^2 \leq q^2 \leq 8.0\,\GeV^2$ and $10.0\,\GeV^2 +\leq q^2 \leq 13.0\,\GeV^2$. +This definition of \qsq ranges are broadly consistent with published results, +and assumes improvements in the electron mode resolution for LHCb~\cite{Lionetto:2624938}. + +Within the SM setup the Wilson coefficients are set to +$\mathcal{C}^{\rm{SM}}_9 = 4.27$, $\mathcal{C}^{\rm{SM}}_{10} = - 4.17$ and $\mathcal{C}^{\rm{SM}}_7 = -0.34$ (see~\cite{Bobeth:2017vxj} and references therein), +corresponding to a fixed renormalisation scale of $\mu = 4.2\,$GeV. +This baseline model is modified for two NP benchmark points (BMP), +$\Delta\WC_9 = - 1$ and $\Delta\WC_9 = - \Delta\WC_{10} = - 0.7$, +referred respectively to as \texttt{BMP}$_{\WC_9}$ and \texttt{BMP}$_{\WC_{9,10}}$, +where NP is inserted only in the case of muons, \textit{i.e.} $\WC_i^{(e)} = \WC_i^{\rm{SM}}$. +These points are favoured by several global fit +analyses with similar significance~\cite{Capdevila:2017bsm,Altmannshofer:2017yso,Hurth:2017hxg}. + +An extended unbinned maximum likelihood fit is performed to these simulated samples, +in which multivariate Gaussian terms are added to the log-likelihood to incorporate prior knowledge +on the nuisance parameters. +In order to probe the model-independence of the framework, the non-local hadronic +parametrisation is modified in several ways, \textit{i.e.} +% +\begin{enumerate} + % + \item[i.] baseline $\mathcal{H}_\lambda[z^2]$ SM prediction~\cite{Bobeth:2017vxj} + included as a multivariate Gaussian constraint; + % + \item[ii.] no theoretical assumption on $\mathcal{H}_\lambda[z^2]$ + and with free-floating parameters; + % + \item[iii.] higher orders of the analytical expansion of $\mathcal{H}_\lambda[z^{n}]$ + up to $z^3$ and $z^4$ - free floating; + % + \item[iv.] and re-parametrisation of its description as + proposed in Ref.~\cite{Hurth:2017sqw}, \textit{i.e.} + using instead an expansion in terms of $1 + a_{\lambda} + b_{\lambda}(q^{2}/6\,$GeV$^{2})$. + + % +\end{enumerate} +On the other hand, form factors parameters are taken from~\cite{Straub:2015ica} and, in order +to guarantee a good agreement between Light-Cone Sum Rules~\cite{Ball:1998kk,Khodjamirian:2006st} +and Lattice results~\cite{Becirevic:2006nm,Horgan:2013hoa}, +their uncertainties are doubled with respect to Ref.~\cite{Straub:2015ica}. + + +Figure~\ref{fig:C9ellipse} shows the fit results for several alternative parametrisations +of the non-local hadronic contribution for the \texttt{BMP}$_{\WC_9}$ hypothesis, +with yields corresponding to LHCb Run-II scenario. +We observe that the sensitivity to $\widetilde{\WC}_9^{(\mu,e)}$ is strongly dependent on +the model assumption used for the non-local matrix elements. +Nonetheless, it is noticeable that the high correlation of the +$\widetilde{\mathcal{C}}_9^{(\mu)}$ and $\widetilde{\mathcal{C}}_9^{(e)}$ coefficients +is sufficient to preserve the true underlying physics at any order of the series expansion $\mathcal{H}_\lambda[z^n]$ +and without any parametric theoretical input, +\textit{i.e.} the two-dimensional pull estimator with respect to the LFU hypothesis is unbiased. +% +\begin{figure}[t] +\includegraphics[width=.4\textwidth]{ellipses_C9.pdf} +\caption{% + Two-dimensional sensitivity scans for the pair of Wilson coefficients + $\widetilde{\mathcal{C}}_9^{(\mu)}$ and $\widetilde{\mathcal{C}}_9^{(e)}$ + for different non-local hadronic parametrisation models evaluated at \texttt{BMP}$_{\WC_9}$, + and with the expected statistics after \lhcb Run II. + The contours correspond to 99\% confidence level statistical-only uncertainty bands and + the dotted black line indicates the LFU hypothesis. +} +\label{fig:C9ellipse} +\end{figure} +% +We note that, as commonly stated in the literature (see \textit{e.g.} recent review in Ref.~\cite{Capdevila:2017ert}), +the determination of $\WC_{10}^{(\mu,e)}$ is insensitive to the lack of knowledge on the +non-local hadronic effects. Nevertheless, its precision is still bounded to the uncertainties on the form factors, +that are found to be the limiting factor by the end of Run-II. +% +\begin{figure}[bth!] +%\begin{center} +\includegraphics[width=.4\textwidth]{ellipses_DeltaC9C10_a.pdf}\\%\quad\quad\quad\quad +\includegraphics[width=.4\textwidth]{ellipses_DeltaC9C10_b.pdf} +\caption{% + Two-dimensional sensitivity scans for the proposed observables $\Delta\WC_9$ and $\Delta\WC_{10}$ + for different non-local hadronic parametrisation models + evaluated at (top) \texttt{BMP}$_{\WC_9}$ and (bottom) \texttt{BMP}$_{\WC_{9,10}}$, + and with the expected statistics after \lhcb Run II. + The contours correspond to 99\% confidence level statistical-only uncertainty bands. + \label{fig:DeltaC9C10} +} +%\end{center} +\end{figure} + +The sensitivity to the two benchmark-like NP scenarios using the proposed pseudo observables $\Delta \WC_i$ +is shown in Fig.~\ref{fig:DeltaC9C10}. +We quantify the maximal expected significance with respect to the SM to be $4.6$ and $5.3\,\sigma$ for +\texttt{BMP}$_{\WC_9}$ and \texttt{BMP}$_{\WC_{9,10}}$, respectively. +Realistic experimental effects are necessary to determine the exact sensitivity achievable. +Nevertheless, these results suggest that a first observation (with a single measurement) of LFU breaking +appears to be feasible with the expected recorded statistics by the end of LHCb Run II. +Furthermore, it is interesting to examine the prospects for confirming this evidence in the upcoming LHCb/Belle +upgrades~\cite{Albrecht:2017odf}. +Figure~\ref{fig:DeltaC9C10_Upgrade} summarises the two-dimensional statistical-only significances +for the designed luminosities. +Both LHCb Upgrade and Belle II experiments have comparable sensitivities (within $8.0-10\,\sigma$), +while LHCb High-Lumi has an overwhelming significance. +These unprecedented datasets will not only yield insights on this phenomena but also +enable a deeper understanding of the nature of NP - +insensitive to both local and non-local hadronic uncertainties. + + +\begin{figure}[t!] +\includegraphics[width=.4\textwidth]{ellipses_DeltaC9C10_Nev.pdf} +\caption{% + Two-dimensional sensitivity scans for the proposed observables $\Delta\WC_9$ and $\Delta\WC_{10}$ + for the two considered NP scenarios: (green) \texttt{BMP}$_{\WC_9}$ and (red) \texttt{BMP}$_{\WC_{9,10}}$. + The contours correspond to 99\% confidence level statistical-only uncertainty bands expected for the (dashed) \belle II 50~ab$^{-1}$ + and \lhcb Upgrade (dotted) $50\,$fb$^{-1}$ and (solid) $\,300\,$fb$^{-1}$ statistics. + \label{fig:DeltaC9C10_Upgrade} +} +\end{figure} + +Experimental resolution and detector acceptance/efficiency effects +are not considered in this work, as these would require further information +from current (non-public) or planned \textit{B}-physics experiments. +Nevertheless, the precision on this measurement can remain unbiased +either by parametrising these effects in the amplitude model and/or even +re-computing the angles or the $q^2$ variables constraining the $B$ invariant mass~\cite{Lionetto:2624938}. +%Nevertheless, preliminary studies on the impact of a finite \qsq resolution are performed +%assuming a \qsq-constant asymmetric smearing of the di-lepton invariant mass +%in the electron mode; the size and asymmetry of such smearing is naively chosen +%to reproduce the mass fits of Ref.~\cite{Aaij:2017vbb}. +%Despite the low \qsq asymmetric tail, the determination of $\Delta\WC_9$ and +%$\Delta\WC_{10}$ remains unbiased, even if no-correction is +%applied. +Moreover, the differential decay width can receive additional complex amplitudes from signal-like backgrounds, +\textit{e.g.} $K\pi$ S-wave from a non-resonant decay and/or a scalar resonance~\cite{Becirevic:2012dp}. +These contributions are determined to be small~\cite{Aaij:2015oid,Aaij:2016flj}, +and in the proposed formalism they benefit from the same description between the muon +and electron mode (see detailed discussion in Ref.~\cite{Chrzaszcz:2018yza}). +Therefore, such contribution does not dilute the expected sensitivity of the measurement. + +Another important test to probe the stability of the model consists in +analysing potential issues that can rise if the truncation +$\mathcal{H}_\lambda[z^n]$ is not a good description of nature. +We proceed as follows: we generate ensembles with non-zero coefficients for +$\mathcal{H}_\lambda[z^3]$ and $\mathcal{H}_\lambda[z^4]$, and we perform the fit +with $\mathcal{H}_\lambda[z^2]$. +Despite the mis-modelling of the non-local hadronic effects in the fit, we observe +that the determination of $\Delta\WC_9$ and $\Delta\WC_{10}$ is always unbiased, +thanks to the relative cancellation of all the shared parameters between the two channels. +It is worth mentioning that a hypothetical determination of the individual +$\widetilde{\WC}_9^{(\mu,e)}$ and $\widetilde{\WC}_{10}^{(\mu,e)}$ WCs +can also produce a shift in their central values +that mimics the behaviour of NP~\cite{Chrzaszcz:2018yza}.% and makes impossible any claim in this direction. + + + +In conclusion, we propose a clean and model-independent method to combine +all the available information from $\bar{B}\to \bar{K}^*\ell^+\ell^-$ decays for a precise +determination of LFU-breaking differences of WCs, \textit{i.e.} $\Delta\WC_9$ +and $\Delta\WC_{10}$. +This relies on a shared parametrisation of the local (form-factors) and non-local ($\mathcal{H}_\lambda[z^n]$) +hadronic matrix elements between the muonic and electronic channels, +that in turn enables the determination of the observables of interest +free from any theoretical uncertainty. +In addition, this simultaneous analysis is more robust against +experimental effects such +as mismodeling of the detector resolution, since most parameters are +effectively determined from the muon mode. This would be an important +benefit for LHCb where the electron resolution is significantly worse +than that of muons. +% +\begin{figure}[t!] +\includegraphics[width=.4\textwidth]{B2Kstll_summary.pdf} +\caption{% + Sensitivity to \texttt{BMP}$_{\WC_{9,10}}$ scenario for the expected statistics after the \lhcb Run II. + The relative contribution (68, 95, 99\% confidence level contours) of each step of the analysis is shown in different colours, + together with the result of full amplitude method proposed in this letter. + \label{fig:allComponents} +} +\end{figure} +% +Figure~\ref{fig:allComponents} illustrates the usefulness of the newly-proposed observables by combining +the different information from angular analysis to branching ratio measurements. +Due to the inclusiveness of the approach, the expected sensitivity surpasses any +of the projections for the foreseen measurements of \textit{e.g.} $R_{K^{*}}$ or $P^{\prime}_{5}$ alone - given the benchmark points. +Therefore, this novel formalism can be the most immediate method to observe unambiguously +NP in $\bar{B}\to \bar{K}^*\ell^+\ell^-$ decays. + +A promising feature of this framework is the possibility to extend the analysis to +include other decay channels involving flavour changing neutral currents. +For instance, the charged decay $\bar{B}^+ \to \bar{K}^{*+} \ellell$ undergoes the same physics +and is easily accessible at the $B$-factories, while other rare +semi-leptonic decays such as $B^+ \to K^+ \ellell$ and $\Lambda_{b} \to \Lambda^{(*)} \ell^+\ell^-$ +have a different phenomenology but access the same NP information in terms of WC description. +Thus, an unbinned global simultaneous fit to all data involving $b \to s \ell^+ \ell^-$ transitions +is a natural and appealing extension of this work. +Moreover, the parameter space of the investigated WCs can also be broadened to +incorporate direct measurement of the right-handed $\WC_i^{\prime}$ - +currently weakly constrained by global fits~\cite{Capdevila:2017bsm,Altmannshofer:2017yso,Hurth:2017hxg}. + + +We acknowledge useful contributions from Michele Atzeni, Gino Isidori, Danny van Dyk and Patrick Owen. +This work is supported by the Swiss National Science Foundation (SNF) under contracts 173104 and 174182. + + +%\FloatBarrier +\bibliography{references} + +\end{document} diff --git a/prd/main/ellipses_C9.pdf b/prd/main/ellipses_C9.pdf new file mode 100644 index 0000000..13293f7 --- /dev/null +++ b/prd/main/ellipses_C9.pdf Binary files differ diff --git a/prd/main/ellipses_DeltaC9C10_Nev.pdf b/prd/main/ellipses_DeltaC9C10_Nev.pdf new file mode 100644 index 0000000..1ed7ece --- /dev/null +++ b/prd/main/ellipses_DeltaC9C10_Nev.pdf Binary files differ diff --git a/prd/main/ellipses_DeltaC9C10_a.pdf b/prd/main/ellipses_DeltaC9C10_a.pdf new file mode 100644 index 0000000..80501e8 --- /dev/null +++ b/prd/main/ellipses_DeltaC9C10_a.pdf Binary files differ diff --git a/prd/main/ellipses_DeltaC9C10_b.pdf b/prd/main/ellipses_DeltaC9C10_b.pdf new file mode 100644 index 0000000..b20ff0d --- /dev/null +++ b/prd/main/ellipses_DeltaC9C10_b.pdf Binary files differ diff --git a/prd/main/references.bib b/prd/main/references.bib new file mode 100644 index 0000000..09be6a3 --- /dev/null +++ b/prd/main/references.bib @@ -0,0 +1,820 @@ +@misc{suppl, + title = "{See Supplemental Material at [URL will be inserted by publisher] + for sensitivity studies on the determination of the Wilson coefficients + $\mathcal{C}_9^{\prime\,(\mu)}$ and $\mathcal{C}{10}^{\prime\,(\mu)}$}" +} +@article{Becirevic:2012dp, + author = "Becirevic, Damir and Tayduganov, Andrey", + title = "{Impact of $B\to K^\ast_0 \ell^+\ell^-$ on the New + Physics search in $B\to K^\ast \ell^+\ell^-$ decay}", + journal = "Nucl. 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Phys. J.", + volume = "C73", + year = "2013", + pages = "2646", + doi = "10.1140/epjc/s10052-013-2646-9", + eprint = "1308.1501", + archivePrefix = "arXiv", + primaryClass = "hep-ph", + reportNumber = "FERMILAB-PUB-13-310-T, MITP-13-047", + SLACcitation = "%%CITATION = ARXIV:1308.1501;%%" +} +@article{Crivellin:2015era, + author = "Crivellin, Andreas and Hofer, Lars and Matias, Joaquim + and Nierste, Ulrich and Pokorski, Stefan and Rosiek, + Janusz", + title = "{Lepton-flavour violating $B$ decays in generic $Z'$ + models}", + journal = "Phys. Rev.", + volume = "D92", + year = "2015", + number = "5", + pages = "054013", + doi = "10.1103/PhysRevD.92.054013", + eprint = "1504.07928", + archivePrefix = "arXiv", + primaryClass = "hep-ph", + reportNumber = "CERN-PH-TH-2015-091, TTP15-018", + SLACcitation = "%%CITATION = ARXIV:1504.07928;%%" +} +# Leptoquarks +@article{Hiller:2014yaa, + author = "Hiller, Gudrun and Schmaltz, Martin", + title = "{$R_K$ and future $b \to s \ell \ell$ physics beyond the + standard model opportunities}", + journal = "Phys. Rev.", + volume = "D90", + year = "2014", + pages = "054014", + doi = "10.1103/PhysRevD.90.054014", + eprint = "1408.1627", + archivePrefix = "arXiv", + primaryClass = "hep-ph", + reportNumber = "DO-TH-14-17", + SLACcitation = "%%CITATION = ARXIV:1408.1627;%%" +} +@article{Biswas:2014gga, + author = "Biswas, Sanjoy and Chowdhury, Debtosh and Han, Sangeun + and Lee, Seung J.", + title = "{Explaining the lepton non-universality at the LHCb and + CMS within a unified framework}", + journal = "JHEP", + volume = "02", + year = "2015", + pages = "142", + doi = "10.1007/JHEP02(2015)142", + eprint = "1409.0882", + archivePrefix = "arXiv", + primaryClass = "hep-ph", + SLACcitation = "%%CITATION = ARXIV:1409.0882;%%" +} +@article{Gripaios:2014tna, + author = "Gripaios, Ben and Nardecchia, Marco and Renner, S. A.", + title = "{Composite leptoquarks and anomalies in $B$-meson + decays}", + journal = "JHEP", + volume = "05", + year = "2015", + pages = "006", + doi = "10.1007/JHEP05(2015)006", + eprint = "1412.1791", + archivePrefix = "arXiv", + primaryClass = "hep-ph", + SLACcitation = "%%CITATION = ARXIV:1412.1791;%%" +} +# QCD issues +@article{Jager:2012uw, + author = "Jäger, S. and Martin Camalich, J.", + title = "{On $B \to V \ell \ell$ at small dilepton invariant + mass, power corrections, and new physics}", + journal = "JHEP", + volume = "05", + year = "2013", + pages = "043", + doi = "10.1007/JHEP05(2013)043", + eprint = "1212.2263", + archivePrefix = "arXiv", + primaryClass = "hep-ph", + SLACcitation = "%%CITATION = ARXIV:1212.2263;%%" +} +@article{Jager:2014rwa, + author = "Jäger, Sebastian and Martin Camalich, Jorge", + title = "{Reassessing the discovery potential of the $B \to K^{*} + \ell^+\ell^-$ decays in the large-recoil region: SM + challenges and BSM opportunities}", + journal = "Phys. Rev.", + volume = "D93", + year = "2016", + number = "1", + pages = "014028", + doi = "10.1103/PhysRevD.93.014028", + eprint = "1412.3183", + archivePrefix = "arXiv", + primaryClass = "hep-ph", + SLACcitation = "%%CITATION = ARXIV:1412.3183;%%" +} +@article{Aaij:2014ora, + author = "Aaij, Roel and others", + title = "{Test of lepton universality using $B^{+}\rightarrow + K^{+}\ell^{+}\ell^{-}$ decays}", + collaboration = "LHCb", + journal = "Phys. Rev. Lett.", + volume = "113", + year = "2014", + pages = "151601", + doi = "10.1103/PhysRevLett.113.151601", + eprint = "1406.6482", + archivePrefix = "arXiv", + primaryClass = "hep-ex", + reportNumber = "CERN-PH-EP-2014-140, LHCB-PAPER-2014-024", + SLACcitation = "%%CITATION = ARXIV:1406.6482;%%" +} +@article{Aaij:2017vbb, + author = "Aaij, R. and others", + title = "{Test of lepton universality with $B^{0} \rightarrow + K^{*0}\ell^{+}\ell^{-}$ decays}", + collaboration = "LHCb", + journal = "JHEP", + volume = "08", + year = "2017", + pages = "055", + doi = "10.1007/JHEP08(2017)055", + eprint = "1705.05802", + archivePrefix = "arXiv", + primaryClass = "hep-ex", + reportNumber = "LHCB-PAPER-2017-013, CERN-EP-2017-100", + SLACcitation = "%%CITATION = ARXIV:1705.05802;%%" +} +% BR measurements +@article{Aaij:2013aln, + author = "Aaij, R and others", + title = "{Differential branching fraction and angular analysis of + the decay $B_s^0\to\phi\mu^{+}\mu^{-}$}", + collaboration = "LHCb", + journal = "JHEP", + volume = "07", + year = "2013", + pages = "084", + doi = "10.1007/JHEP07(2013)084", + eprint = "1305.2168", + archivePrefix = "arXiv", + primaryClass = "hep-ex", + reportNumber = "CERN-PH-EP-2013-078, LHCB-PAPER-2013-017", + SLACcitation = "%%CITATION = ARXIV:1305.2168;%%" +} +@article{Aaij:2014pli, + author = "Aaij, R. and others", + title = "{Differential branching fractions and isospin asymmetries + of $B \to K^{(*)} \mu^+ \mu^-$ decays}", + collaboration = "LHCb", + journal = "JHEP", + volume = "06", + year = "2014", + pages = "133", + doi = "10.1007/JHEP06(2014)133", + eprint = "1403.8044", + archivePrefix = "arXiv", + primaryClass = "hep-ex", + reportNumber = "LHCB-PAPER-2014-006, CERN-PH-EP-2014-055", + SLACcitation = "%%CITATION = ARXIV:1403.8044;%%" +} +@article{Hiller:2003js, + author = "Hiller, Gudrun and Kruger, Frank", + title = "{More model-independent analysis of $b \to s$ processes}", + journal = "Phys. Rev.", + volume = "D69", + year = "2004", + pages = "074020", + doi = "10.1103/PhysRevD.69.074020", + eprint = "hep-ph/0310219", + archivePrefix = "arXiv", + primaryClass = "hep-ph", + reportNumber = "LMU-18-03, TUM-HEP-519-03", + SLACcitation = "%%CITATION = HEP-PH/0310219;%%" +} +@article{Bordone:2016gaq, + author = "Bordone, Marzia and Isidori, Gino and Pattori, Andrea", + title = "{On the Standard Model predictions for $R_K$ and + $R_{K^*}$}", + journal = "Eur. Phys. J.", + volume = "C76", + year = "2016", + number = "8", + pages = "440", + doi = "10.1140/epjc/s10052-016-4274-7", + eprint = "1605.07633", + archivePrefix = "arXiv", + primaryClass = "hep-ph", + SLACcitation = "%%CITATION = ARXIV:1605.07633;%%" +} +@article{Capdevila:2017bsm, + author = "Capdevila, Bernat and Crivellin, Andreas and + Descotes-Genon, Sébastien and Matias, Joaquim and Virto, + Javier", + title = "{Patterns of New Physics in $b\to s\ell^+\ell^-$ + transitions in the light of recent data}", + journal = "JHEP", + volume = "01", + year = "2018", + pages = "093", + doi = "10.1007/JHEP01(2018)093", + eprint = "1704.05340", + archivePrefix = "arXiv", + primaryClass = "hep-ph", + reportNumber = "PSI-PR-17-05, LPT-ORSAY-17-19", + SLACcitation = "%%CITATION = ARXIV:1704.05340;%%" +} +@article{Altmannshofer:2017yso, + author = "Altmannshofer, Wolfgang and Stangl, Peter and Straub, + David M.", + title = "{Interpreting Hints for Lepton Flavor Universality + Violation}", + journal = "Phys. Rev.", + volume = "D96", + year = "2017", + number = "5", + pages = "055008", + doi = "10.1103/PhysRevD.96.055008", + eprint = "1704.05435", + archivePrefix = "arXiv", + primaryClass = "hep-ph", + SLACcitation = "%%CITATION = ARXIV:1704.05435;%%" +} +@article{Hurth:2017hxg, + author = "Hurth, T. and Mahmoudi, F. and Martinez Santos, D. and + Neshatpour, S.", + title = "{Lepton nonuniversality in exclusive + $b{\rightarrow}s{\ell}{\ell}$ decays}", + journal = "Phys. Rev.", + volume = "D96", + year = "2017", + number = "9", + pages = "095034", + doi = "10.1103/PhysRevD.96.095034", + eprint = "1705.06274", + archivePrefix = "arXiv", + primaryClass = "hep-ph", + reportNumber = "CERN-TH-2017-110, IPM-P.A-466, MITP-17-035", + SLACcitation = "%%CITATION = ARXIV:1705.06274;%%" +} +@article{Bobeth:2017vxj, + author = "Bobeth, Christoph and Chrzaszcz, Marcin and van Dyk, + Danny and Virto, Javier", + title = "{Long-distance effects in $B\to K^*\ell\ell$ from + Analyticity}", + year = "2017", + eprint = "1707.07305", + archivePrefix = "arXiv", + primaryClass = "hep-ph", + reportNumber = "EOS-2017-01, MIT-CTP-4918, TUM-HEP-1087-17, ZU-TH-17-17", + SLACcitation = "%%CITATION = ARXIV:1707.07305;%%" +} +@article{Blake:2017fyh, + author = "Blake, Thomas and Egede, Ulrik and Owen, Patrick and + Pomery, Gabriela and Petridis, Konstantinos Alexandros", + title = "{An empirical model of the long-distance contributions to + $\bar{B}^{0} \rightarrow \bar{K}^{*0}\mu^{+}\mu^{-}$ + transitions}", + year = "2017", + eprint = "1709.03921", + archivePrefix = "arXiv", + primaryClass = "hep-ph", + SLACcitation = "%%CITATION = ARXIV:1709.03921;%%" +} +@article{Hurth:2017sqw, + author = "Hurth, T. and Langenbruch, C. and Mahmoudi, F.", + title = "{Direct determination of Wilson coefficients using + $B^0\to K^{*0}\mu^+\mu^-$ decays}", + journal = "JHEP", + volume = "11", + year = "2017", + pages = "176", + doi = "10.1007/JHEP11(2017)176", + eprint = "1708.04474", + archivePrefix = "arXiv", + primaryClass = "hep-ph", + reportNumber = "CERN-TH-2017-178, MITP-17-053", + SLACcitation = "%%CITATION = ARXIV:1708.04474;%%" +} +@article{Bobeth:2008ij, + author = "Bobeth, Christoph and Hiller, Gudrun and Piranishvili, + Giorgi", + title = "{CP Asymmetries in bar $B \to \bar{K}^* (\to \bar{K} \pi) + \bar{\ell} \ell$ and Untagged $\bar{B}_s$, $B_s \to \phi + (\to K^{+} K^-) \bar{\ell} \ell$ Decays at NLO}", + journal = "JHEP", + volume = "07", + year = "2008", + pages = "106", + doi = "10.1088/1126-6708/2008/07/106", + eprint = "0805.2525", + archivePrefix = "arXiv", + primaryClass = "hep-ph", + reportNumber = "DO-TH-08-03", + SLACcitation = "%%CITATION = ARXIV:0805.2525;%%" +} +@article{Boyd:1995cf, + author = "Boyd, C. Glenn and Grinstein, Benjamin and Lebed, Richard + F.", + title = "{Model independent extraction of |V(cb)| using dispersion + relations}", + journal = "Phys. Lett.", + volume = "B353", + year = "1995", + pages = "306-312", + doi = "10.1016/0370-2693(95)00480-9", + eprint = "hep-ph/9504235", + archivePrefix = "arXiv", + primaryClass = "hep-ph", + reportNumber = "UCSD-PTH-95-03", + SLACcitation = "%%CITATION = HEP-PH/9504235;%%" +} +@article{Bourrely:2008za, + author = "Bourrely, Claude and Caprini, Irinel and Lellouch, + Laurent", + title = "{Model-independent description of B ---> pi l nu decays + and a determination of |V(ub)|}", + journal = "Phys. Rev.", + volume = "D79", + year = "2009", + pages = "013008", + doi = "10.1103/PhysRevD.82.099902, 10.1103/PhysRevD.79.013008", + note = "[Erratum: Phys. Rev.D82,099902(2010)]", + eprint = "0807.2722", + archivePrefix = "arXiv", + primaryClass = "hep-ph", + reportNumber = "CPT-P36-2007", + SLACcitation = "%%CITATION = ARXIV:0807.2722;%%" +} +@article{Straub:2015ica, + author = "Bharucha, Aoife and Straub, David M. and Zwicky, Roman", + title = "{$B\to V\ell^+\ell^-$ in the Standard Model from + light-cone sum rules}", + journal = "JHEP", + volume = "08", + year = "2016", + pages = "098", + doi = "10.1007/JHEP08(2016)098", + eprint = "1503.05534", + archivePrefix = "arXiv", + primaryClass = "hep-ph", + reportNumber = "TUM-HEP-957-14, CP3-Origins-2015-010-DNRF90, + DIAS-2015-10", + SLACcitation = "%%CITATION = ARXIV:1503.05534;%%" +} +@article{Paul:2016urs, + author = "Paul, Ayan and Straub, David M.", + title = "{Constraints on new physics from radiative $B$ decays}", + journal = "JHEP", + volume = "04", + year = "2017", + pages = "027", + doi = "10.1007/JHEP04(2017)027", + eprint = "1608.02556", + archivePrefix = "arXiv", + primaryClass = "hep-ph", + SLACcitation = "%%CITATION = ARXIV:1608.02556;%%" +} +@techreport{Aaij:2244311, + author = "Aaij, Roel and others", + title = "{Expression of Interest for a Phase-II LHCb Upgrade: + Opportunities in flavour physics, and beyond, in the HL-LHC + era}", + institution = "CERN", + collaboration = "LHCb Collaboration", + address = "Geneva", + number = "CERN-LHCC-2017-003", + month = "Feb", + year = "2017", + reportNumber = "CERN-LHCC-2017-003", + url = "http://cds.cern.ch/record/2244311", +} +@thesis{Lionetto:2624938, + author = "Lionetto, Federica and Serra, Nicola and Steinkamp, Olaf + and Mueller, Katharina", + title = "{Measurements of Angular Observables of $B^0\to K^{*0} + \mu^+ \mu^-$ and $B^0 \to K^{*0} e^+ e^-$ Decays and the + Upgrade of LHCb}", + month = "Feb", + year = "2018", + reportNumber = "CERN-THESIS-2018-074", + url = "https://cds.cern.ch/record/2624938", + note = "Presented 22 Mar 2018", + howpublished = "\url{https://cds.cern.ch/record/2624938}" +} +@article{Capdevila:2017ert, + author = "Capdevila, Bernat and Descotes-Genon, Sebastien and + Hofer, Lars and Matias, Joaquim", + title = "{Hadronic uncertainties in $B \to K^* \mu^+ \mu^-$: a + state-of-the-art analysis}", + journal = "JHEP", + volume = "04", + year = "2017", + pages = "016", + doi = "10.1007/JHEP04(2017)016", + eprint = "1701.08672", + archivePrefix = "arXiv", + primaryClass = "hep-ph", + reportNumber = "ICCUB-17-003, UAB-FT-990, LPT-ORSAY-16-89", + SLACcitation = "%%CITATION = ARXIV:1701.08672;%%" +} +@article{Aaij:2016flj, + author = "Aaij, Roel and others", + title = "{Measurements of the S-wave fraction in $B^{0}\rightarrow + K^{+}\pi^{-}\mu^{+}\mu^{-}$ decays and the + $B^{0}\rightarrow K^{\ast}(892)^{0}\mu^{+}\mu^{-}$ + differential branching fraction}", + collaboration = "LHCb", + journal = "JHEP", + volume = "11", + year = "2016", + pages = "047", + doi = "10.1007/JHEP11(2016)047, 10.1007/JHEP04(2017)142", + note = "[Erratum: JHEP04,142(2017)]", + eprint = "1606.04731", + archivePrefix = "arXiv", + primaryClass = "hep-ex", + reportNumber = "CERN-EP-2016-141, LHCB-PAPER-2016-012", + SLACcitation = "%%CITATION = ARXIV:1606.04731;%%" +} +@article{Albrecht:2017odf, + author = "Albrecht, Johannes and Bernlochner, Florian and Kenzie, + Matthew and Reichert, Stefanie and Straub, David and + Tully, Alison", + title = "{Future prospects for exploring present day anomalies in + flavour physics measurements with Belle II and LHCb}", + year = "2017", + eprint = "1709.10308", + archivePrefix = "arXiv", + primaryClass = "hep-ph", + SLACcitation = "%%CITATION = ARXIV:1709.10308;%%" +} +@article{PhysRevD.8.3633, + title = {Asymptotically free gauge theories. I}, + author = {Gross, David J. and Wilczek, Frank}, + journal = {Phys. Rev. D}, + volume = {8}, + issue = {10}, + pages = {3633--3652}, + numpages = {0}, + year = {1973}, + month = {Nov}, + publisher = {American Physical Society}, + doi = {10.1103/PhysRevD.8.3633}, + url = {http://link.aps.org/doi/10.1103/PhysRevD.8.3633} +} +@article{Politzer:1974fr, + author = "Politzer, H. David", + title = "{Asymptotic freedom: an approach to strong interactions}", + journal = "Phys.Rept.", + volume = "14", + pages = "129-180", + doi = "10.1016/0370-1573(74)90014-3", + year = "1974", + reportNumber = "PRINT-74-1223 (HARVARD)", + SLACcitation = "%%CITATION = PRPLC,14,129;%%", +} +@article{Gross:1998jx, + author = "Gross, David J.", + title = "{Twenty five years of asymptotic freedom}", + journal = "Nucl.Phys.Proc.Suppl.", + volume = "74", + pages = "426-446", + doi = "10.1016/S0920-5632(99)00208-X", + year = "1999", + eprint = "hep-th/9809060", + archivePrefix = "arXiv", + primaryClass = "hep-th", + SLACcitation = "%%CITATION = HEP-TH/9809060;%%", +} +@article{Ball:1998kk, + author = "Ball, Patricia and Braun, Vladimir M.", + title = "{Exclusive semileptonic and rare B meson decays in QCD}", + journal = "Phys. Rev.", + volume = "D58", + year = "1998", + pages = "094016", + doi = "10.1103/PhysRevD.58.094016", + eprint = "hep-ph/9805422", + archivePrefix = "arXiv", + primaryClass = "hep-ph", + reportNumber = "CERN-TH-98-162, NORDITA-98-41-HE", + SLACcitation = "%%CITATION = HEP-PH/9805422;%%" +} +@article{Khodjamirian:2006st, + author = "Khodjamirian, Alexander and Mannel, Thomas and Offen, + Nils", + title = "{Form-factors from light-cone sum rules with B-meson + distribution amplitudes}", + journal = "Phys. Rev.", + volume = "D75", + year = "2007", + pages = "054013", + doi = "10.1103/PhysRevD.75.054013", + eprint = "hep-ph/0611193", + archivePrefix = "arXiv", + primaryClass = "hep-ph", + reportNumber = "SI-HEP-2006-03", + SLACcitation = "%%CITATION = HEP-PH/0611193;%%" +} +@article{Becirevic:2006nm, + author = "Becirevic, Damir and Lubicz, Vittorio and Mescia, + Federico", + title = "{An Estimate of the B ---> K* gamma form factor}", + journal = "Nucl. Phys.", + volume = "B769", + year = "2007", + pages = "31-43", + doi = "10.1016/j.nuclphysb.2007.01.032", + eprint = "hep-ph/0611295", + archivePrefix = "arXiv", + primaryClass = "hep-ph", + reportNumber = "LPT-ORSAY-06-73, RM3-TH-06-22", + SLACcitation = "%%CITATION = HEP-PH/0611295;%%" +} +@article{Horgan:2013hoa, + author = "Horgan, Ronald R. and Liu, Zhaofeng and Meinel, Stefan + and Wingate, Matthew", + title = "{Lattice QCD calculation of form factors describing the + rare decays $B \to K^* \ell^+ \ell^-$ and $B_s \to \phi + \ell^+ \ell^-$}", + journal = "Phys. Rev.", + volume = "D89", + year = "2014", + number = "9", + pages = "094501", + doi = "10.1103/PhysRevD.89.094501", + eprint = "1310.3722", + archivePrefix = "arXiv", + primaryClass = "hep-lat", + reportNumber = "DAMTP-2013-45, MIT-CTP-4507", + SLACcitation = "%%CITATION = ARXIV:1310.3722;%%" +} +@inproceedings{Mauri:2018, + author = "Chrzaszcz, Marcin and Mauri, Andrea and Serra, Nicola and Silva Coutinho, Rafael and van Dyk, Danny", + title = "{Prospects for data-driven analyses of the decays $B \to K^* \ell^+ \ell^-$}", + booktitle = "{$b \to s \ell \ell$ 2018: 6th Workshop on Rare Semileptonic B Decays, February 20-22}", + url = "https://indico.ph.tum.de/event/3782/sessions/558/attachments/2681/3011/NonLocalMEs2.pdf", + year = "2018", + eprint = "[In preparation]", +} +@article{Aaij:2013qta, + author = "Aaij, R and others", + title = "{Measurement of Form-Factor-Independent Observables in + the Decay $B^{0} \to K^{*0} \mu^+ \mu^-$}", + collaboration = "LHCb", + journal = "Phys. Rev. Lett.", + volume = "111", + year = "2013", + pages = "191801", + doi = "10.1103/PhysRevLett.111.191801", + eprint = "1308.1707", + archivePrefix = "arXiv", + primaryClass = "hep-ex", + reportNumber = "LHCB-PAPER-2013-037, CERN-PH-EP-2013-146", + SLACcitation = "%%CITATION = ARXIV:1308.1707;%%" +} + diff --git a/prd/suppl.pdf b/prd/suppl.pdf new file mode 100644 index 0000000..78fbf6b --- /dev/null +++ b/prd/suppl.pdf Binary files differ diff --git a/references.bib b/references.bib index 3963f7f..c36ca1d 100644 --- a/references.bib +++ b/references.bib @@ -1,3 +1,18 @@ +@article{Becirevic:2012dp, + author = "Becirevic, Damir and Tayduganov, Andrey", + title = "{Impact of $B\to K^\ast_0 \ell^+\ell^-$ on the New + Physics search in $B\to K^\ast \ell^+\ell^-$ decay}", + journal = "Nucl. Phys.", + volume = "B868", + year = "2013", + pages = "368-382", + doi = "10.1016/j.nuclphysb.2012.11.016", + eprint = "1207.4004", + archivePrefix = "arXiv", + primaryClass = "hep-ph", + reportNumber = "LPT-12-79, LAL-12-274", + SLACcitation = "%%CITATION = ARXIV:1207.4004;%%" +} @article{Chrzaszcz:2018yza, author = "Chrzaszcz, Marcin and Mauri, Andrea and Serra, Nicola and Silva Coutinho, Rafael and van Dyk, Danny", @@ -612,14 +627,18 @@ reportNumber = "CERN-LHCC-2017-003", url = "http://cds.cern.ch/record/2244311", } -@thesis{Lionetto:XX, - author = "Lionetto, Federica", - title = "{Measurement of angular observables of $B^0 \rightarrow K^{*0}e^+e^-$ and $B^0 \rightarrow K^{*0}\mu^+\mu^-$ decays and the upgrade of LHCb}", - month = "Mar", +@thesis{Lionetto:2624938, + author = "Lionetto, Federica and Serra, Nicola and Steinkamp, Olaf + and Mueller, Katharina", + title = "{Measurements of Angular Observables of $B^0\to K^{*0} + \mu^+ \mu^-$ and $B^0 \to K^{*0} e^+ e^-$ Decays and the + Upgrade of LHCb}", + month = "Feb", year = "2018", - reportNumber = "CERN-THESIS-2018-XX", - url = "http://cds.cern.ch/record/2045786", - note = "Presented 22 March 2018", + reportNumber = "CERN-THESIS-2018-074", + url = "https://cds.cern.ch/record/2624938", + note = "Presented 22 Mar 2018", + howpublished = "\url{https://cds.cern.ch/record/2624938}" } @article{Capdevila:2017ert, author = "Capdevila, Bernat and Descotes-Genon, Sebastien and