- % This program can be redistributed and/or modified under the terms
- % of the GNU Public License, version 3.
- %
- % Seth Brown, Ph.D.
- % sethbrown@drbunsen.org
- %
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- % Dependencies:
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- \usetheme{bunsen}
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-
- % see the macros.tex file for definitions
- \include{macros}
-
- % title slide definition
- \title{Searches for New Physics with LHCb}
- \author{Marcin Chrz\k{a}szcz}
- \institute[Institute of Nuclear Physics]
- {
- University of Zurich,
- \newline Institute of Nuclear Physics Krakow,
- \newline on behalf of LHCb collaboration
- \\{~}\\
- }
-
-
- \date{$29^{th}$ May 2014}
-
- %--------------------------------------------------------------------
- % Introduction
- %--------------------------------------------------------------------
-
- \begin{document}
-
-
-
- \setbeamertemplate{background}
- {\includegraphics[width=\paperwidth,height=\paperheight]{frontpage_bg_mine}}
- \setbeamertemplate{footline}[default]
-
- \begin{frame}
- \vspace{1.1cm}
- \begin{columns}
- \column{2.75in}
- \titlepage
-
- \begin{center}
- \includegraphics[height=1cm,keepaspectratio ]{uzh.jpg}
- \hspace{0.5cm}
- \includegraphics[height=1cm]{pic/LHCb_logo.jpg}
- \hspace{0.5cm}
- \includegraphics[height=1cm]{pic/ifj.png}
- \end{center}
- \vspace{10cm}
- \column{2.0in}
- \end{columns}
- \end{frame}
-
- %--------------------------------------------------------------------
- % OUTLINE
- %--------------------------------------------------------------------
-
-
-
-
- \section[Outline]{}
- \begin{frame}
- \tableofcontents
- \end{frame}
-
-
-
-
-
-
-
- %-------------------------------------------------------------------
- % Introduction
- %-------------------------------------------------------------------
- %
- % Set the background for the rest of the slides.
- % Insert infoline
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- {\includegraphics[width=\paperwidth,height=\paperheight]{slide_bg}}
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- %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
- %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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- {\includegraphics[width=\paperwidth,height=\paperheight]{slide_bg}}
- \setbeamertemplate{footline}[bunsentheme]
- %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
- \section{LHCb detector}
-
- \begin{frame}\frametitle{LHCb detector}
- \begin{columns}
- \column{3.in}
- \begin{center}
- \includegraphics[width=0.98\textwidth]{det.jpg}
- \end{center}
-
- \column{2.1in}
- \begin{footnotesize}
-
- \begin{block}{}
- \circled{1} LHCb is a forward spectrometer:
- \begin{itemize}
- \item Excellent vertex resolution.
- \item Efficient trigger.
- \item High acceptance for $\Ptau$ and $\PB$.
- \item Great Particle ID.
- \end{itemize}
-
-
- \end{block}
-
- \end{footnotesize}
- \end{columns}
-
- \textref{M.Chrz\k{a}szcz 2014}
- \end{frame}
-
- \section{Lepton Flavour Violation}
- \begin{frame}\frametitle{Lepton Flavour/Number Violation}
- \begin{small}
- Lepton Flavour Violation(LFV):
- \end{small}
-
-
- \begin{footnotesize}
-
- After $\Pmuon$ was discovered it was logical to think of it as an excited $\Pelectron$.
- \begin{columns}
- \column{3in}
- \begin{itemize}
- \item Expected: $B(\mu\to\Pe\gamma) \approx 10^{-4}$
- \item Unless another $\Pnu$, in intermediate vector boson loop cancels.
- \end{itemize}
- \column{2in}
- {~}\includegraphics[width=0.98\textwidth]{rabi.png}
-
- \end{columns}
- \begin{columns}
- \column{1in}
- {~}
- \column{3in}
- \begin{block}{I.I.Rabi:}
- "Who ordered that?"
- \end{block}
- \column{2in}
- {~}\includegraphics[scale=0.08]{II_Rabi.jpg}
-
- \end{columns}
-
-
- \begin{itemize}
- \item Up to this day charged LFV is being searched for in various decay modes.
- \item LFV was already found in neutrino sector.
- \end{itemize}
- \end{footnotesize}
-
-
- \begin{footnotesize}
-
- \begin{columns}
- \column{3.5in}
- \begin{small}
- Lepton Number Violation (LNV)
- \end{small}
-
- \begin{itemize}
- \item Even with LFV, lepton number is a conserved quantity.
- \item Many new thesis predict it violation(Majorana neutrinos)
- \item Searched in so called Neutrinoless double $\beta$ decays.
- \end{itemize}
-
- \column{1.5in}
- \includegraphics[width=0.8\textwidth]{Double_beta_decay_feynman.png}
-
- \end{columns}
-
- \end{footnotesize}
- %Double_beta_decay_feynman.png
-
- \textref{M.Chrz\k{a}szcz 2014}
- \end{frame}
-
-
- % \section{Lepton Number Violation}
- \section{$\PB$ decays}
- \subsection{$\PBminus\to h^{+}\Plepton^{-}\Plepton^{-}$}
- \begin{frame}%[t]
- \frametitle{LNV in bottom decays}%$\PBminus\to h^{+}\ell^{-}\ell^{-}$}
-
- \only<1>{
- \begin{columns}\begin{column}{.5\textwidth}
- on-shell neutrino
-
- \includegraphics[width=\textwidth]{pic/B-Majorana2.pdf}
- \end{column}
- {\begin{column}{.45\textwidth}
- virtual neutrino
-
- \includegraphics[width=\textwidth]{pic/B-Majorana1.pdf}
- \end{column}
- }
- \end{columns}
- \begin{columns}
- \begin{column}{.5\textwidth}
- \begin{itemize}
- \item resonant production in accessible mass range
- \item rates depend on Majorana neutrino--lepton coupling $|V_{\mu 4}|$
- \newline {\footnotesize{(e.g.\ \href{http://arxiv.org/abs/0901.3589}{arXiv:0901.3589)}}}
- \item $m_4 = m_{\Plepton^{-},\Ppiplus}$
- \end{itemize}
- \end{column}
- {
- \begin{column}{.5\textwidth}
- \begin{exampleblock}{Special for $\PB$ decays}
- %\begin{itemize}
- Diagram without mass restriction
- Cabbibo favoured for $\PB\to\PD$
- Analogous to double $\beta$ decay.
- %\end{itemize}
- \end{exampleblock}
- \end{column}
- }
- \end{columns}
- }
- \textref{M.Chrz\k{a}szcz 2014}
- \end{frame}
-
- %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
- \setbeamertemplate{background}
- {\includegraphics[width=\paperwidth,height=\paperheight]{slide_bg}}
- \setbeamertemplate{footline}[bunsentheme]
-
-
- %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
- \begin{frame}[t]
- \frametitle{Virtual Majorana neutrinos}
-
-
- \begin{columns}
- \only<1>{
- \begin{column}{.78\textwidth}
- \begin{block}{}
- %\begin{itemize}
- $\PBminus\to\PDplus\Pmuon\Pmuon\quad\quad\quad\quad\quad\quad\PBminus\to\PD^{*+}\Pmuon\Pmuon$
- %\end{itemize}
- \includegraphics[width=\textwidth]{pic/MassFitDp_.pdf}
- \end{block}
- \end{column}
- }
-
-
- \end{columns}
- \only<1>{{
- {~}
-
-
- $\mathcal{B}(\PBminus\to\PDplus\Pmuon\Pmuon)<6.9\times 10^{-7} \quad \quad \mathcal{B}(\PBminus\to\PD^{*+}\Pmuon\Pmuon)<2.4\times 10^{-6}$
- }}
-
-
- {@ 95\,\% CL}\hspace{.35\textwidth}
- {@ 95\,\% CL}
- \\ Based on $0.41fb^{-1}${~}$7TeV$ data.
-
- {~}
-
- \begin{columns}
- \begin{column}{6.5cm}
- \end{column}
- \begin{column}{1.5cm}
- %\includegraphics[width=\textwidth]{pic/LHCb_logo.jpg}
- \end{column}
- \begin{column}{4cm}
- \hspace{.4cm}
-
- {\footnotesize{\href{http://prd.aps.org/abstract/PRD/v85/i11/e112004}{\texttt{Phys. Rev.D85 (2012) 112004 }}}}
-
- \end{column}
- \end{columns}
-
- %LHCb, arXiv:1201.5600
- %\includegraphics[width=.5\textwidth]{UpperAll}
- \textref{M.Chrz\k{a}szcz 2014}
- \end{frame}
-
- %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
- \begin{frame}[t]
- \frametitle{On-shell Majorana neutrinos}
- \begin{itemize}
- \item Based on full data set${~}3fb^{1}$.
- \item Cut based analysis.
- \item Normalization channel $\PBplus \to \PJpsi(\mu\mu)\PKplus$.
- \item Searched performed for two scenarios:
- \begin{itemize}
- \item Short life-time neutrinos: $\tau_4 <1ps$
- \item Long life-time neutrinos: $\tau_4 \in (1,1000) ps$
- \end{itemize}
- \end{itemize}
- \begin{columns}
-
- \only<1>{
- \includegraphics[width=\textwidth]{Figure2.png}
- }
-
- \end{columns}
-
-
- \begin{columns}
- \begin{column}{8.5cm}
-
- \includegraphics[width=\textwidth]{Figure3.png}
-
- \end{column}
- \begin{column}{.5cm}
- %\includegraphics[width=\textwidth]{pic/LHCb_logo.jpg}
- \end{column}
-
- \begin{column}{4cm}
- \hspace{.4cm}
-
-
- {\footnotesize{\href{http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.112.131802}{\texttt{Phys. Rev. Lett. 112, 131802 }}}}
-
- \end{column}
- \end{columns}
-
-
- \textref{M.Chrz\k{a}szcz 2014}
- \end{frame}
-
-
-
- %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
- \begin{frame}[t]
- \frametitle{On-shell Majorana neutrinos}
- {~}\\
- \begin{columns}
- \column{2.in}
- \includegraphics[width=\textwidth]{Figure5.png}\\
- \includegraphics[width=\textwidth]{Figure6.png}\\
-
-
- \column{3.0in}
- \begin{small}
- \begin{itemize}
- \item In absence of signal UL. were set.
- \item $Br(\PBminus \to \Ppiplus \Pmuon \Pmuon)$ in range $10^{-9}$.
- \item Limits also set for the coupling $| V_{\mu 4} |^2$
- \end{itemize}
- {~}{~}$Br(\PBminus \to \Ppiplus \Pmuon \Pmuon) = \dfrac{G_f^4 f_B^2f_{\pi}^2}{128\pi\hbar } \tau_B m_B^5 |V_{ub}V_{ud}|^2|V_{\mu4}|^4(1- \dfrac{m_4^2}{m_B^2})\dfrac{m_4}{\Gamma_{N_4}}$
- \end{small}
- \end{columns}
- \textref{M.Chrz\k{a}szcz 2014}
- \end{frame}
-
-
- %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% johan %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
- \begin{frame}
- \frametitle{Summary on LNV in $\PB$ decays}
- \vspace{0.5cm}
- \begin{columns}
- \begin{column}{.65\textwidth}
- \begin{footnotesize}
- \begin{tabular}{lclr}
- channel & limit & & \\\hline
- $\mathcal{B}(\PBminus\to\Ppi^{+}\Pelectron\Pelectron) $ & $<2.3\times 10^{-8}$ & @$90\,\%$ CL &\includegraphics[height=.25cm]{babar}\footnote{BaBar,\href{http://link.aps.org/doi/10.1103/PhysRevD.85.071103}{Phys.\ Rev.\ D \textbf{85}, 071103} (2012)\label{babarB}}\\
- $\mathcal{B}(\PBminus\to\PK^{+}\Pelectron\Pelectron) $ & $<3.0\times 10^{-8}$ & @$90\,\%$ CL &\includegraphics[height=.25cm]{babar}\footnotesize{$^{\text{\ref{babarB}}}$}\\
- $\mathcal{B}(\PBminus\to\PK^{*+}\Pelectron\Pelectron) $ & $<2.8\times 10^{-6}$ & @$90\,\%$ CL & \includegraphics[height=.25cm]{cleo}\footnote{CLEO, \href{http://link.aps.org/doi/10.1103/PhysRevD.65.111102}{Phys.\ Rev.\ D \textbf{65}, 111102} (2002)\label{cleolnv}}\\
- $\mathcal{B}(\PBminus\to\Prho^{+}\Pelectron\Pelectron) $ & $<2.6\times 10^{-6}$ & @$90\,\%$ CL & \includegraphics[height=.25cm]{cleo}\footnotesize{$^{\text{\ref{cleolnv}}}$}\\
- $\mathcal{B}(\PBminus\to\PD^{+}\Pelectron\Pelectron) $ & $<2.6\times 10^{-6}$ & @$90\,\%$ CL & \includegraphics[height=.25cm]{belle2-logo}\footnote{Belle, \href{http://link.aps.org/doi/10.1103/PhysRevD.84.071106}{Phys.\ Rev.\ D \textbf{84}, 071106(R)}, (2011)\label{bellelnv}}\\
- $\mathcal{B}(\PBminus\to\PD^{+}\Pelectron\Pmuon) $ & $<1.8\times 10^{-6}$ & @$90\,\%$ CL & \includegraphics[height=.25cm]{belle2-logo}\footnotesize{$^{\text{\ref{bellelnv}}}$}\\
- $\mathcal{B}(\PBminus\to\Ppi^{+}\Pmuon\Pmuon)$ & $<1.3\times 10^{-8}$ & @$95\,\%$ CL & \includegraphics[height=.25cm]{pic/LHCb_logo.jpg}\footnote{LHCb, CERN-PH-EP-2012-006, \href{http://arxiv.org/abs/1201.5600}{\texttt{arXiv:1201.5600}} (2012)\label{xxxxx}} \\
- $\mathcal{B}(\PBminus\to\PK^{+}\Pmuon\Pmuon) $ & $<5.4\times 10^{-7}$ & @$95\,\%$ CL &\includegraphics[height=.25cm]{pic/LHCb_logo.jpg}\footnote{LHCb, \href{http://link.aps.org/doi/10.1103/PhysRevLett.108.101601}{Phys.\ Rev.\ Lett.\ 108 101601} (2012)} \\
- %$\mathcal{B}(\PBminus\to\PK^{*+}\Pmuon\Pmuon) $ & $<4.4\times 10^{-6}$ & @$90\,\%$ CL & \includegraphics[height=.25cm]{cleo}\footnotesize{$^{\text{\ref{cleolnv}}}$}\\
- %$\mathcal{B}(\PBminus\to\Prho^{+}\Pmuon\Pmuon) $ & $<5.0\times 10^{-6}$ & @$90\,\%$ CL & \footnotesize{$^{\text{\ref{cleolnv}}}$}\\
- $\mathcal{B}(\PBminus\to\PD^{+}\Pmuon\Pmuon) $ & $<6.9\times 10^{-7}$ & @$95\,\%$ CL & \includegraphics[height=.25cm]{pic/LHCb_logo.jpg}\footnotesize{$^{\text{\ref{xxxxx}}}$}\\
- $\mathcal{B}(\PBminus\to\PD^{*+}\Pmuon\Pmuon)$ & $<2.4\times 10^{-6}$ & @$95\,\%$ CL & \includegraphics[height=.25cm]{pic/LHCb_logo.jpg}\footnotesize{$^{\text{\ref{xxxxx}}}$}\\
- $\mathcal{B}(\PBminus\to\PDs^{+}\Pmuon\Pmuon)$ & $<5.8\times 10^{-7}$ & @$95\,\%$ CL & \includegraphics[height=.25cm]{pic/LHCb_logo.jpg}\footnotesize{$^{\text{\ref{xxxxx}}}$}\\
- $\mathcal{B}(\PBminus\to\PDzero\Ppiminus\Pmuon\Pmuon)$ & $<1.5\times 10^{-6}$ & @$95\,\%$ CL & \includegraphics[height=.25cm]{pic/LHCb_logo.jpg}\footnotesize{$^{\text{\ref{xxxxx}}}$}\\
- \hline
- \end{tabular} %pic/LHCb_logo.jpg
- \end{footnotesize}
- \end{column}
- \end{columns}
- \textref{M.Chrz\k{a}szcz 2014}
- \end{frame}
-
-
- %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
- \subsection{$\PB\to \Plepton^{+}\Plepton^{-}$}
- \begin{frame}%[t]
- \frametitle{$\PB\to \Plepton^{+}\Plepton^{-}$ 1}%$\PBminus\to h^{+}\ell^{-}\ell^{-}$}
- \begin{footnotesize}
- \begin{columns}
-
- \column{3in}
-
- \begin{itemize}
- \item A separate physics interest are LFV $\PB$ decays.
- \item Predicted by various NP models: lepto-quarks, SUSY, GUT.
- \item Analysis based on $1fb^{-1}$ 2011 data.
- \item Analogues to our $\PBs \to \mu \mu$ analysis(Phys. Rev. Lett. 110, 021801 (2013))
- \end{itemize}
-
-
-
- \column{2in}
- \includegraphics[width=\textwidth]{blind.png}\\
- \end{columns}
-
- \begin{enumerate}
- \item Loose reselection based on topology and PID.
- \item Classifier trained on MC signal and $b\bar{b} \to \Plepton \Plepton X$
- \item Calibration channel: $\PBzero_{(s)} \to h^+ h^{'-}$
- \item Normalization Channel: $\PBzero \to \PKplus \Ppiminus$
- \item CLs method for limit extraction.
- \end{enumerate}
- \end{footnotesize}
-
-
-
- \begin{columns}
- \begin{column}{6.5cm}
- \end{column}
- \begin{column}{1.5cm}
- %\includegraphics[width=\textwidth]{pic/LHCb_logo.jpg}
- \end{column}
- \begin{column}{4cm}
- \hspace{.4cm}
- {\footnotesize{\href{http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.111.141801}{\texttt{Phys. Rev. Lett. 111, 141801 (2013) }}}}
-
- \end{column}
- \end{columns}
- \textref{M.Chrz\k{a}szcz 2014}
- \end{frame}
-
- %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
-
-
- \begin{frame}%[t]
- \frametitle{$\PB_{(s)} \to \Plepton^{+}\Plepton^{-}$ 2}
- \begin{footnotesize}
- \begin{columns}
-
- \column{3.1in}
-
- \begin{itemize}
- \item Correction to MC and DATA discrepancies.
- \item Excellent proxy: $\PBzero_{(s)} \to h h'$.
- \item Fit each BDT bin for $\PBzero_{(s)} \to h h'$ and extract number of events.
- \item Correct MC efficiency for each bin.
- \item Electron Bremsstrahlung corrected on $\PJpsi \to \Pe \Pe$.
- \end{itemize}
-
- \column{1.9in}
- \includegraphics[width=\textwidth]{Fig4a-supp.pdf}\\
- \end{columns}
- \begin{columns}
-
- \column{2.3in}
- %\includegraphics[width=\textwidth]{ClsB.png}\\
- \includegraphics[width=\textwidth]{CLS2.png}\\
- \column{3.1in}
- %\includegraphics[width=\textwidth]{Fig1a-supp.pdf}\\
- \begin{tabular}{ c | c | c }
- {~} & $Br(\PB \to \Pe \Pmu)$ & $Br(\PB_s \to \Pe \Pmu)$ \\
- {~} & \at~$ 90(95)\% CL$ & at~$90(95)\% CL$ \\ \hline
- \textcolor{blue}{Expected} & \textcolor{blue}{$4.0(5.0)\times 10^{-9}$}& \textcolor{blue}{$1.5(2.0)\times 10^{-8}$} \\
- \textcolor{red}{Observed} & \textcolor{red}{$2.8(3.7)\times 10^{-9}$}& \textcolor{red}{$1.1(1.4)\times 10^{-8}$} \\
-
- \end{tabular}
-
-
- \end{columns}
-
-
- \end{footnotesize}
- \textref{M.Chrz\k{a}szcz 2014}
- \end{frame}
-
- %%%%%%%%%%
- \begin{frame}%[t]
- \frametitle{$\PB_{(s)} \to \Plepton^{+}\Plepton^{-}$ Implications}
- \begin{footnotesize}
- \begin{itemize}
- \item LHCb limits exceeds previous CDF by $20$ times.
- \item CDF implications to lepto-quarks mass\footnote{Theoretical formula Phys. Rev. D 50 (1994) 6843}.
- \begin{itemize}
- \item $m_{LQ}(\PBs \to \Pe \Pmu) >47.8(44.9) TeV$ \@ $90(95\%)$ \at CL.
- \item $m_{LQ}(\PBzero \to \Pe \Pmu) >59.3(56.3) TeV$ \@ $90(95\%)$ \at CL.
-
- \end{itemize}
- \end{itemize}
-
- \begin{center}
- \begin{columns}
- \column{0.4in}
- {~}
- \column{1.85in}
- \includegraphics[width=\textwidth]{Fig2a-supp.pdf}\\
- \column{0.2in}
- {~}
- \column{1.85in}
- \includegraphics[width=\textwidth]{Fig2b-supp.pdf}\\
- \column{0.4in}
- {~}
- \end{columns}
-
- \end{center}
- LHCb limits:
- \begin{itemize}
- \item $m_{LQ}(\PBs \to \Pe \Pmu) >107(101) TeV$ \@ $90(95\%)$ \at CL.
- \item $m_{LQ}(\PBzero \to \Pe \Pmu) >135(126) TeV$ \@ $90(95\%)$ \at CL.
-
- \end{itemize}
-
- \end{footnotesize}
- \textref{M.Chrz\k{a}szcz 2014}
- \end{frame}
-
-
-
-
-
-
-
-
- %%%%%%%%%%%%%%%%%%%%%%%%%
- %%%%%%%%%%%%%%%%%%%%%%%%%%
- %%%%%%%%%%%%%%%%%%%%%%%%
-
-
-
-
-
-
- %\section{Lepton Flavour Violation}
- \section{$\tau$ decays}
-
-
- \subsection{$\Ptauon\to\Pmuon\Pmuon\APmuon$}
- \begin{frame}\frametitle{Curent status}
-
-
-
-
- \frametitle{$\Ptau \to \mu \mu \mu$}
-
- \only<1>{
-
-
-
- \begin{center}
- \begin{columns}
- \column{3in}
- \begin{block}{}
- \circled{1} In SM small $\mathcal{B}( \Ptauon\to\Pmuon\Pmuon\APmuon ) \sim 10^{-50} $ \\
- \circled{2} NP can enhance $\mathcal{B}$. \\
- \circled{3} Nature still hides $\Ptauon\to\Pmuon\Pmuon\APmuon$ from us.\\
- \circled{4} Current limits:
- \end{block}
- \column{2in}
- \includegraphics[width=\textwidth]{tau23mu.png}\\
-
-
- \end{columns}
-
-
- \begin{center}
- \begin{tabular}{| l | l |}
- \hline Experiment & $90\%$ CL limit \\
- \hline
- \hline BaBar & $3.3 \times 10^{-8}$ \\
- \hline Belle & $2.1 \times 10^{-8}$ \\
- \hline
- \end{tabular}
- \end{center}
- \begin{block}{}
- \circled{5} Can a hadron collider change the picture? \\
- \end{block}
-
-
-
-
-
-
- \end{center}
- }
- \textref{M.Chrz\k{a}szcz 2012}
- \end{frame}
-
- %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
- \begin{frame}\frametitle{Analysis approach}
- \begin{columns}
- \column{2.5in}
- $\mathcal{B}$ factories
-
-
- \column{2.5in}
- LHCb, ($7 TeV$, 2011 data)
-
-
-
- \end{columns}
- \begin{columns}
- \column{2.5in}
-
-
- \begin{block}{}
- \circled{1} Clean signal: $\APelectron\Pelectron\to\APtauon\Ptauon$ \\
- \circled{2} Calculate the thrust axis \\
- \circled{3} "Partial tag" the other $\tau$ \\
- \circled{4} Small cross section $0.919nb$ \\
- \end{block}
- \column{2.5in}
-
- \begin{block}{}
- \circled{1} Inclusive $\tau$ cross section: \newline $79.5\pm\unit{8.3}{\micro\barn}$. \\
- \circled{2} $8 \times 10^{10} \tau$ produced. \\
- \circled{3} Dominant contribution: \newline $\PDs\to\Ptau\Pnut$ ($78\%$) \\
- \circled{4} No tag possible. \\
- \end{block}
-
-
-
- \end{columns}
-
-
- \textref{M.Chrz\k{a}szcz 2012}
- \end{frame}
-
- \begin{frame}
- \frametitle{Strategy}
- \begin{columns}
- \begin{column}{.5\textwidth}
- \begin{itemize}
- \item Loose cut based selection
- \item Classification in 3D space:
- \begin{itemize}
- \item invariant mass
- \item decay topology\newline (multivariate)
- \item particle identification\newline (multivariate)
- \end{itemize}
- \item Classifier trained on simulation
- \item Calibration with control channel
- \item Normalization with $\PDs \to \phi(\mu \mu) \pi$
- \item CLs method to extract the result
- \end{itemize}
- \end{column}
- \begin{column}{.5\textwidth}
-
- \begin{block}{Signal \& Calibration \& Background channel}
- \includegraphics[width=.7\textwidth]{topos}
- \newline
- \includegraphics[width=.7\textwidth]{topob2.png}
- \end{block}
- \end{column}
- \end{columns}
- \textref{M.Chrz\k{a}szcz 2012}
- \end{frame}
-
- %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%5
-
-
- \begin{frame}
- \frametitle{Signal likelihoods}
- \begin{columns}\begin{column}{.48\textwidth}
- \begin{block}{particle identification}
- \begin{itemize}
- \item hits in muon chambers
- \item energy in calorimeters
- \begin{itemize}
- \item compatible with MIP
- \end{itemize}
- \item RICH response
- \end{itemize}
- \end{block}
- \begin{exampleblock}{Calibration}
- $\PJpsi\to\APmuon\Pmuon$
- \end{exampleblock}
- \includegraphics[width=\textwidth]{Fig4b.png}
- \end{column}
-
- \begin{column}{.48\textwidth}
-
- \begin{block}{3 body decay likelihood}
- \begin{itemize}
- \item vertex properties
- \begin{itemize}
- \item vertex fit, pointing
- \end{itemize}
- \item track quality
- \item isolation
- \end{itemize}
- \end{block}
- \begin{exampleblock}{Calibration}
- $\PDs\to\Pphi\Ppi$
- \end{exampleblock}
- \includegraphics[width=\textwidth]{Fig4a.png}
- \end{column}
-
- \end{columns}
-
-
-
-
-
- \textref{M.Chrz\k{a}szcz 2014}
- \end{frame}
- %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
- % \underbrace{•}
-
-
- %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
-
- \begin{frame}
- \frametitle{Signal likelihoods}
- \begin{columns}
- \begin{column}{.8\textwidth}
- \begin{block}{combined signal distribution}
- \begin{itemize}
- \item events distributed over 25 likelihood bins
- \item background estimate from mass side-bands
-
- \end{itemize}
- \end{block}
- Signal efficiency in 3-BODY BDT vs PID BDT plane.
- \end{column}
- \begin{column}{.2\textwidth}
-
-
-
- \end{column}
-
- \end{columns}
- \begin{columns}
- \begin{column}{.48\textwidth}
- %\only<1>{\includegraphics[width=\textwidth]{./2d-data2.pdf}}
- \only{\includegraphics[width=\textwidth]{FIG6.png}}
- \end{column}
- \begin{column}{.48\textwidth}
- %\only<1>{\includegraphics[width=\textwidth]{./2d-data2.pdf}}
- \only{\includegraphics[width=\textwidth]{Fig2a.png}}
- \end{column}
-
- \end{columns}
- \textref{M.Chrz\k{a}szcz 2014}
-
- \end{frame}
-
-
-
-
- \begin{frame}
- \frametitle{Extracted upper limit}
- \begin{columns}\begin{column}{.8\textwidth}
-
- \vspace{1.0cm}
-
- \begin{tabular}{|l|l|l|l|}
- \hline
- & \text{observed} & \text{expected} & \text{CL} \\
- \hline
- $\mathcal{B}(\Ptau\to\Pmu\Pmu\Pmu)$ & $8.0\times 10 ^{-8}$ & $8.3\times 10^{-8}$ & $90\%$\\
- & $ 9.8\times 10 ^{-8}$ & $10.2\times 10^{-8}$ & $95\%$ \\
- \hline
- \end{tabular}
-
-
-
- \end{column}
- \begin{column}{.2\textwidth}
- \includegraphics[width=.46\textwidth]{pic/LHCb_logo.jpg}
- \hspace{.5em}$\unit{1}{\reciprocal\femtobarn}$
-
- {\footnotesize{\href{http://www.sciencedirect.com/science/article/pii/S0370269313004450}{\texttt{PLB 724 (2013) 36-45 }}}}
- \end{column}
- \end{columns}
- \begin{columns}
- \begin{column}{.65\textwidth}
- \includegraphics[width=0.8\textwidth]{Fig3a.png}
- \end{column}
- \begin{column}{.04\textwidth}
-
- \end{column}
- \begin{column}{.35\textwidth}
-
-
- \end{column}
- \end{columns}
- \textref{M.Chrz\k{a}szcz 2014}
- \end{frame}
- %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
- \begin{frame}
- \frametitle{Summary}
- \begin{itemize}
- \item LFV and LNV processes are doing very well in LHCb.
- \item Lots of best limits already in our hands.
- \item Keep tune, lots of new results are coming very soon.
- \end{itemize}
-
-
- \textref{M.Chrz\k{a}szcz 2014}
-
- \end{frame}
-
-
-
-
-
-
- \end{document}