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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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