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\author{ {Marcin Chrzaszcz} (CERN)}
\institute{UZH}
\title[$\tau \to \mu \mu\mu$ Run 2 plans]{$\tau \to \mu \mu\mu$ Run 2 plans}
\date{4 October 2017}
\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 \bfseries \Large {$\tau \to \mu \mu\mu$ Run 2 plans}
\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}
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\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}}
\end{column}
\begin{column}{0.53\textwidth}
\hspace{2.6cm}
\includegraphics[height=1.6cm]{cern}
\end{column}
\end{columns}
\vspace{1em}
\footnotesize{\large With M. Palutan (INFN Frascati), F. Teubert (CERN),
R. Vazquez Gomez (CERN)}
\vspace{0.5em}
\textcolor{normal text.fg!50!Comment}{VRD meeting, CERN\\October 4, 2017}
\end{center}
\end{frame}
}
\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
\end{frame}
\begin{frame}
\frametitle{"The Rule of Three"}
\ARROW Since 4 years thee experiments are chasing the $\tau \to \mu \mu \mu$ decay:
\begin{columns}
% \column{2.5in}
\begin{column}{2.1in}
\begin{alertblock}{ $\Ptau \to \Pmu \Pmu \Pmu$ limits ($ \color{white} 90\,\%$ CL)}
\begin{description}
\item[BaBar(FC)] $3.3\times 10^{-8}$
\item[Belle(FC)] $2.1\times 10^{-8}$
\item[LHCb(CLs)] $4.6\times 10^{-8}~(3 {\rm fb}^{-1})$
\item[HFAG(CLs)] $1.2 \times 10^{-8}$
\end{description}
\end{alertblock}
\end{column}
\begin{column}{2.5in}
\includegraphics[width=1\textwidth]{zom.png}\\
\end{column}
\end{columns}
{~}\\
\begin{itemize}
\item Thanks to 3 experiments we have a world limit: $\mathcal{B}(\Ptau \to \Pmu \Pmu \Pmu)< 1.2 \times 10^{-8}$ at 90\% CL.
\item Would be nice to put LHCb ahead of the game!
\item We are getting close to B-factories with the Run2 data but still would be nice to have some boost!
\end{itemize}
\end{frame}
\begin{frame}[c]{Extra Gain ? }
\begin{minipage}{\textwidth}
\ARROW The stripping that we are using takes 3 \texttt{StdLooseMuons} and construct a $\tau$ candidate. \\
\ARROW Now the stripping is loose in other variables.
\begin{center}
\begin{tabular}{| c || c | c |}
\hline
& \multicolumn{2}{c|}{Gain wrt. 3 isM $[\%]$ }\\
Category & 2 isM & 2isM + 3AccM \\ \hline
$ B \to \tau$ & $44.53$ & $12.67$ \\
$ B \to D_s \to \tau$ & $44.37$ & $12.44$ \\
$ D_s \to \tau $ & $43.78$ & $12.34$ \\
$ B \to D \to \tau $ & $46.31$ & $13.97$\\
$ D \to \tau$ & $43.70$ & $11.87$ \\ \hline
\end{tabular}
\end{center}
Legend:
\begin{itemize}
\item isM -IsMuon.
\item AccM - Muon in Acceptance.
\end{itemize}
\ARROW There is extra gain $\mathcal{O}(40~\%)$ that could be included!\\
\ARROW We have already modified the Stripping line and will be run in the S28 restripping.
\end{minipage}\end{frame}
\begin{frame}[c]{Can we trigger?}
\begin{center}
\begin{Huge}
Initial trigger study
\end{Huge}
\end{center}
\end{frame}
\begin{frame}[c]{IsMuon == 3 WITH TOS BUG FIXED!!}
\begin{minipage}{\textwidth}
\begin{center}
\begin{tabular}{|c || c | c|}
\hline
Name & Eff & Gain wrt. to previous \\ \hline
Hlt2TriMuonTau23Mu & 0.76343 & 0.763439 \\
Hlt2SingleMuonLowPT & 0.764768 & 0.001328\\
Hlt2CharmHadDpToPimPipPipTurbo & 0.76515 & 0.00038\\
Hlt2RareCharmD02KPi & 0.76528 & 0.00012\\
Hlt2SingleMuon & 0.765369 & 0.00008\\
Hlt2LowMultDiMuon & 0.765454 & 0.00006\\
Hlt2XcMuXForTauB2XcMu & 0.765454 & 0.0\\ \hline
\end{tabular}
\end{center}
\begin{alertblock}{How to read table}
Example: Hlt2CharmHadDpToPimPipPipTurbo, 0.76444, 0.00071\\
{\color{green}Eff. of }Hlt2CharmHadDpToPimPipPipTurbo || Hlt2SingleMuonLowPT || Hlt2TriMuonTau23Mu is $0.76444$.\\
{\color{green}Gain of adding } Hlt2CharmHadDpToPimPipPipTurbo to previous Hlt2SingleMuonLowPT || Hlt2TriMuonTau23Mu is $0.00071$.
\end{alertblock}
\end{minipage}
\end{frame}
\begin{frame}[c]{IsMuon == 2 WITH TOS BUG FIXED!!}
\begin{minipage}{\textwidth}
\begin{center}
\begin{tabular}{|c || c | c|}
\hline
Name & Eff & Gain wrt. to previous \\ \hline
Hlt2CharmHadDpToPimPipPipTurbo & $0.22792$ & $0.22792$ \\
Hlt2SingleMuon & $0.28015$ & $0.052231$ \\
Hlt2SingleMuonLowPT & $0.28975$ & $0.00960$ \\
Hlt2RareCharmD02KPi & $0.293869$ & $0.004115$ \\
Hlt2CharmHadDspToKpPimPipTurbo& $0.297034$ & $0.003165$\\
Hlt2CharmHadInclSigc2PiLc2HHX & $0.29946$ & $0.00242$ \\
Hlt2RareCharmD02MuMu & $0.30115$ & $0.00168$\\
Hlt2LowMultDiMuon & $0.302732$ & $0.001582$\\
Hlt2TopoMu3Body & $0.303999$ & $0.001266$ \\
Hlt2CharmHadDspToKmPipPipTurbo & $0.30452$ & $0.00052$ \\ \hline
\hline
\end{tabular}
\end{center}
\end{minipage}
\end{frame}
\begin{frame}[c]{Trigger conclusion}
\begin{minipage}{\textwidth}
\begin{itemize}
\item For the 3 \texttt{ISMuon} case we are safe.
\item The 2 \texttt{ISMuon} :
\begin{itemize}
\item Problem will be fixed in 2017 data after bug fix of the Hlt2DiMuonDetached line.
\item For 2015, 2016 we will define our strategy later.
\end{itemize}
\end{itemize}
\end{minipage}
\end{frame}
\begin{frame}[c]{MC filtering}
\begin{minipage}{\textwidth}
\ARROW Producing MC becomes more and more a problem.\\
\ARROW Need a smart way to reduce the data set at the production level:
\begin{alertblock}{MC Filtering:}
Select only the events that are needed for the analysis \ARROW Saving disk space.\\
Caveat: once lost events cannot be recovered.
\end{alertblock}
\begin{exampleblock}{What to filter on?}
\ARROWR Stripping?\\
\ARROWR Trigger?\\
\ARROWR Reconstruction!
\end{exampleblock}
\ARROW Filtering on MCTRUTHMACHED is the safest thing to do!
\end{minipage}\end{frame}
\begin{frame}[c]{How does this work?}
\begin{minipage}{\textwidth}
\ARROW You check that the Particle lists (ex. \texttt{Phys/StdAllNoPIDsMuons/Particles}) contain all particles from the decay (ex. $\tau \to 3 \mu$).\\
\ARROW Very robust! Sensitive only to bugs in reconstruction and TruthMaching.\\
\ARROW Already tested this in $\PB \to \PKstar \mu \mu$ with success.\\
\ARROW Now implemented for $\tau \to \mu\mu\mu$ analysis.
\end{minipage}\end{frame}
\begin{frame}[c]{Filter efficiency}
\begin{minipage}{\textwidth}
\begin{center}
\begin{tabular}{|c|c|}
\hline
Channel & Fraction of save events\\ \hline
$\tau \to 3 \mu$ & $0.553$ \\
$D_s \to \phi \pi$ & $0.481$ \\\hline
\end{tabular}
\end{center}
\ARROW FILTER IS IMMUNE TO ANY \texttt{isMuon} REQUIREMENT.\\
\ARROW We save around $50~\%$ of disk space!
\end{minipage}\end{frame}
\begin{frame}[c]{Cross check}
\begin{minipage}{\textwidth}
\ARROW As a cross-check is performed:
\begin{itemize}
\item Strip the filtered dst.
\item Strip the non filtered dst.
\end{itemize}
\ARROW After truthmaching they both should be identical.\\
\ARROW And they are:\\
\includegraphics[angle=-90,width=0.49\textwidth]{Ds.pdf}
\includegraphics[angle=-90,width=0.49\textwidth]{tau23mu.pdf}
(Yes there are two IDENTICAL histograms on each plot :) )
\end{minipage}\end{frame}
\begin{frame}[c]{Conclusions}
\begin{minipage}{\textwidth}
\ARROW There is a potential $40~\%$ gain of the signal!\\
\ARROW Stripping implemented.\\
\ARROW Filter for MC production developed and tested!\\
\ARROW We gain $50~\%$ on disk space!\\
\ARROW Trigger strategy on the way.\\
\ARROW We would like to ask for 2015,2016,2017 Filtered signal MC.
\end{minipage}
\end{frame}
\backupbegin
\begin{frame}[c]{IsMuon == 3 WITH TOS BUG!!}
\begin{minipage}{\textwidth}
\begin{center}
\begin{tabular}{|c || c | c|}
\hline
Name & Eff & Gain wrt. to previous \\ \hline
Hlt2TriMuonTau23MuDecision & 0.76343 & 0.76343 \\
Hlt2SingleMuonLowPTDecision& 0.76372 & 0.00136\\
Hlt2CharmHadDpToPimPipPipTurbo & 0.76444 & 0.00071\\
Hlt2SingleMuonDecision & 0.76459 & 0.00015\\
Hlt2RareCharmD02KPiDecision &0.76474 & 0.00015\\
Hlt2LowMultDiMuon & 0.76482 & 0.00008\\
Hlt2XcMuXForTauB2XcMuDecision & 0.76482 & 0.0\\
%Hlt2XcMuXForTauB2XcFakeMuDecision & 0.76482 & 0.0\\
%Hlt2TriMuonDetachedDecision & 0.76482 & 0.0\\
%Hlt2TransparentDecision & 0.76482 & 0.0\\
\hline
\end{tabular}
\end{center}
\begin{alertblock}{How to read table}
Example: Hlt2CharmHadDpToPimPipPipTurbo, 0.76444, 0.00071\\
{\color{green}Eff. of }Hlt2CharmHadDpToPimPipPipTurbo || Hlt2SingleMuonLowPT || Hlt2TriMuonTau23Mu is $0.76444$.\\
{\color{green}Gain of adding } Hlt2CharmHadDpToPimPipPipTurbo to previous Hlt2SingleMuonLowPT || Hlt2TriMuonTau23Mu is $0.00071$.
\end{alertblock}
\end{minipage}
\end{frame}
\begin{frame}[c]{IsMuon == 2 WITH TOS BUG!!}
\begin{minipage}{\textwidth}
\begin{center}
\begin{tabular}{|c || c | c|}
\hline
Name & Eff & Gain wrt. to previous \\ \hline
Hlt2CharmHadDpToPimPipPip & $0.18769$ & $0.18769$\\
Hlt2SingleMuonD & $0.25864$ & $0.07095$ \\
Hlt2SingleMuonLowPT & $0.27076$ & $0.01212$\\
Hlt2RareCharmD02KPi & $0.27431$ & $0.003543$\\
Hlt2CharmHadDspToKpPimPip & $0.27738$ & $0.00307$\\
Hlt2CharmHadInclSigc2Pi & $0.279347$ & $0.00195$ \\
Hlt2RareCharmD02MuMu & $0.28121$ & $0.00186$ \\
Hlt2LowMultDiMuon\_PS & $0.28279$ & $0.00158$ \\
Hlt2TopoMu3Body & $0.28400$ & $0.001212$\\
Hlt2PIDKs2PiPiLLTurboCalib & $0.284568$ & $0.00055$\\
\hline
\end{tabular}
\end{center}
\end{minipage}
\end{frame}
\backupend
\end{document}
Marcin CHrzaszcz