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-
- % see the macros.tex file for definitions
- \include{macros }
-
- % title slide definition
- \title{FCNF and L/BNV \\in $\Lambda_c$ decays}
- %\subtitle{a bias report}
- \author{ \underline{Marcin Chrz\k{a}szcz}$^{1,2}$, Tadeusz Lesiak$^{1}$, Mariusz Witek$^{1}$ }
- \institute[UTH]
- {
- %\begin{tiny}
- $ ^1$ Institute of Nuclear Physics, Krakow,\\
- $ ^2$ University of Zurich
-
-
- %\end{tiny}smallsmall
- }
-
-
- \date{ \begin{small} $12^{th}$ Feb 2014 \end{small}}
-
- %--------------------------------------------------------------------
- % Introduction
- %--------------------------------------------------------------------
-
- \begin{document}
-
-
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- % \hspace{0.5cm}
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- \column{2.0in}
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-
- %--------------------------------------------------------------------
- % OUTLINE
- %--------------------------------------------------------------------
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-
-
- \section[Outline]{}
- \begin{frame}
- \tableofcontents
- \end{frame}
-
-
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-
-
-
- %-------------------------------------------------------------------
- % Introduction
- %-------------------------------------------------------------------
- %
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- \title{Report on $\tau \to p \Plepton \Plepton$}
-
-
- %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
- %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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- \setbeamertemplate{background}
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- %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%2>%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
- \section{Motivation}
- \begin{frame}\frametitle{Why to search for $\Lambda_c \to \Pproton \mu^{+} \mu^{-}$?}
-
-
- \begin{itemize}
- \item Decay of $\Lambda_c^+ \to \Pproton \mu^+ \mu^-$ is a FCNC.
- \item Extremely suppressed in SM due to GIM mechanism.
- \item We will use the experience from $\tau \to \Pproton \mu \mu$.
-
- \end{itemize}
-
- \begin{columns}
- \column{2.5in}
- \begin{center}
- \includegraphics[scale=0.18]{new/FCNC.png}
- \end{center}
- ~$\mathcal{B}( \Lambda_c^{+} \to p \mu^{-} \mu^{+} ) < 4.4 \times 10^{-5}$\\
- ~ \@ 90\% CL arXiv:1107.4465
-
- \column{3.5in}
- \includegraphics[scale=0.2]{babar.png}\\
- Yield: $11.1 \pm 5.0 \pm 2.5$
-
- \end{columns}
-
- We should easily beat Babar.
-
- \textref {M.Chrz\k{a}szcz 2014}
- \end{frame}
-
- \section{Strategy}
- \begin{frame}
-
- \frametitle{Strategy}
- {~}
- Follow the strategy of $\tau$ analysis:
- \begin{itemize}
- \item Take prompt $\Lambda_c$, separate approach to SL.
- \item Loose cut preselection.
- \item Train MVA on MC prompt signal and recalibrate on data.
- \item Calibrate on date.
- \item Normalize to $\Lambda_c^{+} \to \Pproton K^{-} \pi^{+}$, $\Lambda_c^{+} \to \Pproton \pi^{-} \pi^{+}$ or $\Lambda_c \to \Pproton \phi(\mu \mu)$.
- \item Optimise the binning in MVA.
- \item CLs method for limit.
- \end{itemize}
- \textref {M.Chrz\k{a}szcz 2013}
- \end{frame}
-
- \section{Normalization channel}
- \begin{frame}\frametitle{Normalization channel}
- \begin{itemize}
- \item We have 3 candidates for normalization channel.
- \begin{enumerate}
- \item $\Lambda_c \to \Pproton \phi(\mu \mu)$, $BR= (2.4 \pm 0.8) \times 10^{-7} $
- \item $\Lambda_c^{+} \to \Pproton K^{-} \pi^{+}$, $BR= (5.0 \pm 1.3) \times 10^{-2} $
- \item $\Lambda_c^{+} \to \Pproton \pi^{-} \pi^{+}$, $BR= (3.5 \pm 2.0) \times 10^{-3} $
- \end{enumerate}
- From above list $\Lambda_c \to \Pproton \phi(\mu \mu)$ is a perfect candidate for normalization.
- However Br is a bit low.
-
-
-
- \end{itemize}
-
-
-
- \textref {M.Chrz\k{a}szcz 2014}
- \end{frame}
-
-
-
- \begin{frame}\frametitle{First look in data I}
- \begin{columns}
-
- \column{2.6in}
- \begin{itemize}
- \item With some PID and vertex cuts we can see our $\Lambda_c \to \Pproton \phi(\mu \mu)$
- \item Back of the envelope calculations predict we should have 400 of those events in $3fb^{-1}$
- \item A bit small for normalization.
- \end{itemize}
- \column{2.5in}
- \includegraphics[scale=0.17]{new/Lc_mass_b.png}\\
- \includegraphics[scale=0.17]{new/Lc_mass.png}
-
- \end{columns}
-
-
-
- \textref {M.Chrz\k{a}szcz 2014}
- \end{frame}
-
-
- \begin{frame}\frametitle{Possible background}
-
- \begin{center}
-
- \begin{tabular}{| c | c | c |}
- \hline
- \textbf{ Resonance} & $\mathcal{B} (\Lambda_c \to p X)$& $\mathcal{B} (X \to \mu \mu)$\\ \hline
-
- $\eta$ & UNKNOWN & $(5.8 \pm 0.6) \times 10^{-6}$ \\ \hline
- $\rho^0$ & UNKNOWN & $(4.55 \pm 0.28) \times 10^{-5}$ \\ \hline
- $\omega$ & UNKNOWN & $(9.1 \pm 3.0) \times 10^{-5}$ \\ \hline
- $f(980)$ & $(2.8 \pm 1.9) \times 10^{-3}$ & UNKNOWN \\ \hline
- $\phi$ & $(8.2 \pm 2.7) \times 10^{-4} $ & $(2.89 \pm 0.19) \times 10^{-4}$ \\ \hline \hline
-
- \textbf{ Resonance} & $\mathcal{B} (\Lambda_c \to p X)$ & $\mathcal{B} (X \to \mu \mu \gamma)$\\ \hline
- $\eta$ & UNKNOWN & $(3.1 \pm 0.4) \times 10^{-4}$ \\ \hline
- \end{tabular}
- \end{center}
-
-
-
-
- \textref {M.Chrz\k{a}szcz 2014}
- \end{frame}
-
-
-
- \begin{frame}\frametitle{First look in data II }
- \begin{columns}
-
- \column{2.6in}
- \begin{itemize}
- \item We also have looked at dimuon spectrum.
- \item Clearly $\phi$, $\eta$, $\omega$ visible.
- \item We also see in data $\Lambda_c \to \omega(\mu \mu) \Pproton$.
- \end{itemize}
- \column{2.5in}
- \includegraphics[scale=0.12]{new/bck.png}\\
-
-
- \end{columns}
-
-
-
- \textref {M.Chrz\k{a}szcz 2014}
- \end{frame}
-
- \section{MVA}
- \begin{frame}\frametitle{Preliminary selection }
-
- \begin{columns}
- \column{2.5in}
- ~Stripping:
- \begin{itemize}
- \item PID($\mu$)>-5, PID($\Pproton$) >10
- \item IPCHi2>9, PID($\mu -K$)>0, GHOST<0.3, PID($\Pproton$)>10, Pt>300
- \item $\Delta m<150MeV$
- \item $c\tau >100\mu m$
- \item $IPChi2 < 225$
- \end{itemize}
- ~Additional:
- \begin{itemize}
- \item Blind region $\vert m(p\mu\mu) - 2286.46 \vert <20 MeV$.
- \item $\phi$, $\omega$ veto.
- \end{itemize}
- \column{3.5in}
-
- \includegraphics[scale=0.18]{new/Lc_mass.png}\\
-
-
-
-
-
- \includegraphics[scale=0.2]{new/blind.png}\\
-
- \end{columns}
-
-
-
- \textref {M.Chrz\k{a}szcz 2014}
- \end{frame}
-
- %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%55
-
-
-
- \begin{frame}\frametitle{Preliminary TMVA}
- \begin{columns}
-
- \column{2.8in}
- \begin{itemize}
- \item Variables adopted form $\tau \to 3\mu$(see Marta's talk).
- \item In the future we will use Blending for the classifiers.
- \item Already thanks to this BDTG we can pick up $\Lambda_c\ \to \omega(\mu\mu) \Pproton$.
-
- \end{itemize}
- \includegraphics[scale=0.2]{new/omega.png}
- \column{2.5in}
- \includegraphics[scale=0.2]{new/overtrain_BDTG.jpg}\\
- \includegraphics[scale=0.2]{new/rejBvsS.jpg}
-
- \end{columns}
-
-
-
- \textref {M.Chrz\k{a}szcz 2014}
- \end{frame}
-
-
- \section{Summary}
- \begin{frame}\frametitle{Summary}
-
- \begin{itemize}
- \item Looks like we will have limits $\mathcal{O}(10^{-7})$ - $\mathcal{O}(10^{-8})$
- \item We already see a new $\Lambda_c \to \omega \Pproton$ decay!
- \item Normalization channel is still open, but we are converging towards $\Lambda_c^{+} \to \Pproton \pi^{-} \pi^{+}$
- \item We have one tight cut on the stripping (flight distance), we are considering several solutions.
-
- \end{itemize}
-
-
- \textref {M.Chrz\k{a}szcz 2014}
- \end{frame}
- \end{document}