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- \author{ {Marcin Chrzaszcz} (CERN)}
- \institute{UZH}
- \title[Review of $B \to K_s \pi^+ \pi^-$ ]{Review of $B \to K_s \pi^+ \pi^-$ }
-
- \date{25 September 2014}
-
-
- \begin{document}
- \tikzstyle{every picture}+=[remember picture]
-
- {
- \setbeamertemplate{sidebar right}{\llap{\includegraphics[width=\paperwidth,height=\paperheight]{bubble2}}}
- \begin{frame}[c]%{\phantom{title page}}
- \begin{center}
- \begin{center}
- \begin{columns}
- \begin{column}{0.75\textwidth}
- \flushright \bfseries \Large {Anatomy of the decay $\PBzero \to \PKshort \Ppi^+ \Ppi^- $ and first observation of the $CP$ asymmetry in the transition $\APBzero \to \PKstar^- \Ppi^+$}
- \end{column}
- \begin{column}{0.02\textwidth}
- {~}
- \end{column}
- \begin{column}{0.23\textwidth}
- % \hspace*{-1.cm}
- \vspace*{-3mm}
- \includegraphics[width=0.6\textwidth]{lhcb-logo}
- \end{column}
-
- \end{columns}
- \end{center}
- \quad
- \vspace{3em}
- \begin{columns}
- \begin{column}{0.44\textwidth}
- \flushright \vspace{-2.8em} { \fontspec{Zapfino} Marcin Chrzaszcz\\\vspace{-0.1em}\small \href{mailto:mchrzasz@cern.ch}{mchrzasz@cern.ch}}
-
- %\flushright \vspace{-2.8em} { Marcin Chrzaszcz\\\vspace{-0.1em}\small \href{mailto:mchrzasz@cern.ch}{mchrzasz@cern.ch}}
-
-
- \end{column}
- \begin{column}{0.53\textwidth}
- \hspace{2.0cm}
- \includegraphics[height=1.6cm]{cern}
- \end{column}
- \end{columns}
-
- \vspace{1em}
-
-
- \textcolor{normal text.fg!50!Comment}{LBT meeting, CERN\\October 6, 2017}
- \end{center}
- \end{frame}
- }
-
-
- \begin{frame}{Yellow pages}
- \vspace{1.5em}
- \begin{minipage}{\textwidth}
- \ARROW Proponents: M. Baalouch, E. Ben-Haim, E. Cogneras, T. Gershon, M. Grabalosa, L. Henry, T. Latham, J.M. Maratas, J. McCarthy, D. Milanes, S. Monteil, R. Silva Coutinho, N. Watson\\
- \ARROW Reviewers: Stephanie Hansmann-Menzemer (chair), Stefano Gallorini\\
- \ARROW EB: Mitesh Patel\\
- \ARROW EB readers: Patrick Koppenburg, Simon Eidelman\\
- \ARROW Twiki: \href{https://twiki.cern.ch/twiki/bin/viewauth/LHCbPhysics/Dalitz_KSPiPi}{\url{https://twiki.cern.ch/twiki/bin/viewauth/LHCbPhysics/Dalitz_KSPiPi}}\\
- \ARROW Jurnal: PRL.\\
-
-
- \vspace{1cm}
-
- \ARROW Deadline for comments: $13^{\rm th}$ October.\\
- \ARROW Please send me comments before: $12^{\rm th}$ October.\\
-
- \end{minipage}
- \vspace*{2.cm}
- \end{frame}
-
-
-
-
- \begin{frame}{Physics in the paper}
- \vspace{1.5em}
- \begin{minipage}{\textwidth}
-
- \begin{columns}
- \column{0.5\textwidth}
-
- \ARROW Looking for new source of CP violation outside the CKM matrix.\\
- \ARROW Looking at the transition $b \to s q\bar{q}$, where $q=u,d,s$.\\
- \ARROW Rule of thumb: CP violation should be similar to the ones in $b \to s c\bar{c}$.\\
- \ARROW The decay $\PBzero \to \PKshort \Ppi^+ \Ppi^- $ has reach resonant structure!!\\
- \ARROWR Dalitz analysis.
-
-
- \column{0.5\textwidth}
- \includegraphics[width=0.9\textwidth]{images/Fig1.png}
-
- \end{columns}
- \ARROW Because of available statistics, the analysis is untagged and time integrated (isobar model):
- \begin{align*}
- P(s_+, s_- )= \frac{ \vert A(s_+, s_-) \vert^2 \vert \bar{A}(s_+, s_-) \vert^2 }{\int\int_{\Omega} ( \vert A(s_+, s_-) \vert^2 \vert \bar{A}(s_+, s_-) \vert^2 ) d s_+ ds_-}
- \end{align*}
-
-
-
- \end{minipage}
- \vspace*{2.cm}
- \end{frame}
-
- \begin{frame}{Physics in the paper}
- \vspace{1.5em}
- \begin{minipage}{\textwidth}
- \ARROW The amplitudes are defined:
- \begin{align*}
- A = \sum_{j=1}^N c_j F_j(s_+, s_-),~~\bar{A} = \sum_{j=1}^N \bar{c}_j \bar{F}_j(s_+, s_-)
- \end{align*}
- \begin{columns}
- \column{0.65\textwidth}
-
- \includegraphics[width=0.9\textwidth]{images/Tab1.png}
- \column{0.35\textwidth}
- \begin{align*}
- A_{CP}= \frac{ \vert \bar{c}_j \vert^2 - \vert c_j \vert^2 }{ \vert \bar{c}_j \vert^2 + \vert c_j \vert^2}
- \end{align*}
-
- \end{columns}
-
- \end{minipage}
- \vspace*{2.cm}
- \end{frame}
-
-
-
- \begin{frame}{Experimental elements}
- \vspace{1.5em}
- \begin{minipage}{\textwidth}
- \ARROW Run1 data set! ($3~{\rm fb}^{-1}$).\\
- \ARROW Interesting trigger solution:
- \begin{itemize}
- \item $\PKshort \to \pi \pi$ can decay outside the VELO.
- \item Only for the second part of 2012 ($1.4~{\rm fb}^{-1}$) there was an HLT2 line implemented which considered downstream $\PKshort$.
- \end{itemize}
- \ARROW BDT for selection.\\
- \ARROW Correcting efficiency in Dalitz plane.
-
- \end{minipage}
- \vspace*{2.cm}
- \end{frame}
-
-
- \begin{frame}{Results}
- \vspace{1.5em}
- \begin{minipage}{\textwidth}
-
- \ARROW Paper reports:\\
- \only<1>{
- \begin{align*}
- \mathcal{F}_j = \frac{\int \int_{\Omega} \vert c_j F_j(s_+, s_-) \vert^2 d s_+ ds_- }{\int \int_{\Omega} \vert \sum_j c_j F_j (s_+, s_-) \vert^2 d s_+ ds_- }
- \end{align*}
- \begin{align*}
- A_{CP}= \frac{ \vert \bar{c}_j \vert^2 - \vert c_j \vert^2 }{ \vert \bar{c}_j \vert^2 + \vert c_j \vert^2}
- \end{align*}
- }
- \only<2>{
- \begin{center}
- \includegraphics[width=0.8\textwidth]{images/Fig2.png}
- \end{center}
-
- }
- \only<3>{
- \begin{center}
- \includegraphics[width=0.8\textwidth]{images/Fig3.png}
- \end{center}
- \ARROW The result is $6.8(6.0)~\sigma$ away from being zero. (including systematics).\\
- \ARROW Reasonable agreement with world average:
- \begin{align*}
- A_{CP} (\PKstar^{\pm} \pi^{\mp})-0.23 \pm 0.06
- \end{align*}
-
- }
- \only<4>{
- \begin{center}
- \includegraphics[width=0.65\textwidth]{images/Fig4.png}
- \end{center}
-
-
- }
- \end{minipage}
- \vspace*{2.cm}
- \end{frame}
-
-
-
-
- \begin{frame}{Systematics}
- \vspace{1.5em}
- \begin{minipage}{\textwidth}
-
- \ARROW There are two cathegories of systematics:
- \begin{itemize}
- \item Experimental.
- \item Model related.
- \end{itemize}
- \ARROW The experimental one were obtained with pseudo experiments.\\
- \ARROW Dominant systematics is the efficiency determination!\\
- \ARROWR Model related systematics are also evaluated:
- \begin{itemize}
- \item Varying each of the parameters of the mean and the width.
- \item related to marginal $f_2(1270)$ and $f_0(500)$ resonance components.
- \end{itemize}
-
-
- \end{minipage}
- \vspace*{2.cm}
- \end{frame}
-
-
- \begin{frame}{First comments}
- \vspace{1.5em}
- \begin{minipage}{\textwidth}
- \ARROW Overall the analysis seems solid!!\\
- \ARROW Some things might be better described in the paper.\\
- \ARROW Some physics comments:
- \begin{itemize}
- \item Non-resonant modelling.
- \item Over estimation of model systematic.
- \item
- \end{itemize}
- \ARROW Paper is to long: $3803$ words (PRL : $3750$).\\
-
-
-
-
- \end{minipage}
- \vspace*{2.cm}
- \end{frame}
-
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