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\author{ {\fontspec{Trebuchet MS}Marcin Chrz\k{a}szcz} (Universit\"{a}t Z\"{u}rich)}
\institute{UZH}
\title[$\PBzero \to \PKstar \Pmuon \APmuon$ EvtGen Model]{$\PBzero \to \PKstar \Pmuon \APmuon$ EvtGen Model}
\date{25 September 2014}
\begin{document}
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\begin{center}
\begin{center}
\begin{columns}
\begin{column}{0.75\textwidth}
\flushright\fontspec{Trebuchet MS}\bfseries \Huge {$\PBzero \to \PKstar \Pmuon \APmuon$\\ EvtGen Model}
\end{column}
\begin{column}{0.02\textwidth}
{~}
\end{column}
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\quad
\vspace{3em}
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\flushright \vspace{-1.8em} {\fontspec{Trebuchet MS} \Large Marcin Chrząszcz\\\vspace{-0.1em}\small \href{mailto:mchrzasz@cern.ch}{mchrzasz@cern.ch}\\ \Large Thomas Blake \\\vspace{-0.1em}\small \href{mailto:thomas.blake@cern.ch}{thomas.blake@cern.ch} }
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\vspace{1em}
% \footnotesize\textcolor{gray}{With N. Serra, B. Storaci\\Thanks to the theory support from M. Shaposhnikov, D. Gorbunov}\normalsize\\
\vspace{0.5em}
\textcolor{normal text.fg!50!Comment}{MC meeting, CERN\\November 8, 2016}
\end{center}
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}
\begin{frame}[c]{Acceptance correction}
\begin{minipage}{\textwidth}
\begin{columns}
\column{0.6\textwidth}
\ARROW The decay of $\PBzero \to \PKstar \Pmuon \APmuon$ is described by 3 helicity angles and the invariant mass squared of two leptons $(q^2)$.\\
\ARROW In order to model the detector acceptance we have used a large MC sample of PHSP simulated events.\\
\ARROW There is a caveat: the $q^2$ distribution.\\
\ARROW We had to reweight it to make it flat.
\column{0.4\textwidth}
\includegraphics[width=0.99\textwidth]{images/q2PHSP.png}\\
\includegraphics[width=0.99\textwidth]{images/q2PHSPw.png}
\end{columns}
\end{minipage}
\vspace*{2.cm}
\end{frame}
\begin{frame}[c]{Can we optimize it?}
\begin{minipage}{\textwidth}
\ARROW It would be nice if we could generate not only the flat angle distributions but also a flat $q^2$.\\
\ARROW There exists already a model for it: \texttt{FLATQ2}.\\
\ARROW It basically reweighs the distribution by $1/p^{\rm had}_T$.\\
\ARROW The problem is that it was design to generate the flat distribution of decays $\PB \to X \ell \nu$ :
\begin{center}
\includegraphics[width=0.7\textwidth]{images/flatq2.png}
\end{center}
\ARROW Will not work in current version for $\PB \to \PKstar \mu \mu$.
\end{minipage}
\vspace*{2.cm}
\end{frame}
\begin{frame}[c]{Modifying the \texttt{FLATQ2} 1 }
\begin{minipage}{\textwidth}
\ARROW I wrote a mirror model that requires that the two leptons are \texttt{DIRAC}, and called it \texttt{FLATQ2EWP}. \\
\ARROW And improves the situation a lot:
\begin{center}
\includegraphics[angle=-90,width=0.8\textwidth]{{images/ForTom_Q2_FLATQ2}.pdf}
\end{center}
\ARROW So much flatter but the and and the begging still not flat.\\
\ARROW End of the spectrum is due to $\PKstar$ width? $\twoheadrightarrow$ Lets test it with $\PB \to \PK \mu \mu$.
\end{minipage}
\vspace*{2.cm}
\end{frame}
\begin{frame}[c]{Modifying the \texttt{FLATQ2} 1 }
\begin{minipage}{\textwidth}
{~}\\
\ARROW \texttt{FLATQ2EWP} use to simulate the $\PB \to \PK \mu \mu$:
\begin{center}
\includegraphics[angle=-90,width=0.75\textwidth]{{images/ForTom_Q2_FLATQ2_Kmumu}.pdf}
\end{center}
\ARROW Oki so end of the spectrum is understood and not much can be done there.\\
\ARROW Now the low $q^2$: Can this be just Phase space suppression: $\sqrt{1-4m_{\ell}^2/q^2}$
\end{minipage}
\vspace*{2.cm}
\end{frame}
\begin{frame}[c]{Modifying the \texttt{FLATQ2} 2 }
\begin{minipage}{\textwidth}
{~}\\
\ARROW \texttt{FLATQ2EWP} with phase space suppression factor.
\begin{center}
\includegraphics[angle=-90,width=0.75\textwidth]{{images/ForTom_Q2_FLATQ2_Kmumu_lambda}.pdf}
\end{center}
\ARROW Now it's perfect.
\end{minipage}
\vspace*{2.cm}
\end{frame}
\begin{frame}[c]{Update since last week }
\begin{minipage}{\textwidth}
{~}\\
\ARROW Discussion was made via: \href{https://its.cern.ch/jira/browse/LHCBGAUSS-911}{JIRA}\\
\ARROW It was suggested my Michal to incorporate the new model into the current one to save the code.\\
\ARROW Thanks to John for merging the two codes:
\begin{center}
\only<1>{
\includegraphics[width=0.7\textwidth]{images/evt1.png}
}
\only<2>{
\includegraphics[width=0.7\textwidth]{images/evt2.png}
}
\end{center}
\end{minipage}
\vspace*{2.cm}
\end{frame}
\begin{frame}[c]{\texttt{FLATQ2} Conclusion }
\begin{minipage}{\textwidth}
{~}\\
\ARROW The new model was tested by me and John.\\
\ARROW Changes won't have any influence on the existing \texttt{DEFILES} as the flag is by default switched off.\\
\ARROW The commit was mearge to master by Gloria today.\\
\ARROW We thank all people involved action\\
\end{minipage}
\vspace*{2.cm}
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\end{document}
mchrzasz