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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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- {
- \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\fontspec{Trebuchet MS}\bfseries \Huge {$\PBzero \to \PKstar \Pmuon \APmuon$\\ EvtGen Model}
- \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{-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} }
-
- \end{column}
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- \includegraphics[height=1.3cm]{uzh-transp}
- \end{column}
- \end{columns}
-
- \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}
- \end{frame}
- }
-
-
- \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}
- \end{frame}
-
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