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Presentations / Lc23Mu / Status_report_12_02_14 / Lc2pll.tex
@mchrzasz mchrzasz on 31 Mar 2014 12 KB update
  1. % This program can be redistributed and/or modified under the terms
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  144. % see the macros.tex file for definitions
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  146.  
  147. % title slide definition
  148. \title{FCNF and L/BNV \\in $\Lambda_c$ decays}
  149. %\subtitle{a bias report}
  150. \author{ \underline{Marcin Chrz\k{a}szcz}$^{1,2}$, Tadeusz Lesiak$^{1}$, Mariusz Witek$^{1}$ }
  151. \institute[UTH]
  152. {
  153. %\begin{tiny}
  154. $ ^1$ Institute of Nuclear Physics, Krakow,\\
  155. $ ^2$ University of Zurich
  156.  
  157.  
  158. %\end{tiny}smallsmall
  159. }
  160.  
  161. \date{ \begin{small} $12^{th}$ Feb 2014 \end{small}}
  162.  
  163. %--------------------------------------------------------------------
  164. % Introduction
  165. %--------------------------------------------------------------------
  166.  
  167. \begin{document}
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  195.  
  196. %--------------------------------------------------------------------
  197. % OUTLINE
  198. %--------------------------------------------------------------------
  199.  
  200.  
  201.  
  202.  
  203. \section[Outline]{}
  204. \begin{frame}
  205. \tableofcontents
  206. \end{frame}
  207.  
  208.  
  209.  
  210.  
  211.  
  212.  
  213.  
  214. %-------------------------------------------------------------------
  215. % Introduction
  216. %-------------------------------------------------------------------
  217. %
  218. % Set the background for the rest of the slides.
  219. % Insert infoline
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  221. {\includegraphics[width=\paperwidth,height=\paperheight]{slide_bg}}
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  223.  
  224. \title{Report on $\tau \to p \Plepton \Plepton$}
  225.  
  226.  
  227. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  228. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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  230. \setbeamertemplate{background}
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  233. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%2>%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  234.  
  235. \section{Motivation}
  236. \begin{frame}\frametitle{Why to search for $\Lambda_c \to \Pproton \mu^{+} \mu^{-}$?}
  237.  
  238.  
  239. \begin{itemize}
  240. \item Decay of $\Lambda_c^+ \to \Pproton \mu^+ \mu^-$ is a FCNC.
  241. \item Extremely suppressed in SM due to GIM mechanism.
  242. \item We will use the experience from $\tau \to \Pproton \mu \mu$.
  243.  
  244. \end{itemize}
  245.  
  246. \begin{columns}
  247. \column{2.5in}
  248. \begin{center}
  249. \includegraphics[scale=0.18]{new/FCNC.png}
  250. \end{center}
  251. ~$\mathcal{B}( \Lambda_c^{+} \to p \mu^{-} \mu^{+} ) < 4.4 \times 10^{-5}$\\
  252. ~ \@ 90\% CL arXiv:1107.4465
  253.  
  254. \column{3.5in}
  255. \includegraphics[scale=0.2]{babar.png}\\
  256. Yield: $11.1 \pm 5.0 \pm 2.5$
  257.  
  258. \end{columns}
  259.  
  260. We should easily beat Babar.
  261.  
  262. \textref {M.Chrz\k{a}szcz 2014}
  263. \end{frame}
  264.  
  265. \section{Strategy}
  266. \begin{frame}
  267.  
  268. \frametitle{Strategy}
  269. {~}
  270. Follow the strategy of $\tau$ analysis:
  271. \begin{itemize}
  272. \item Take prompt $\Lambda_c$, separate approach to SL.
  273. \item Loose cut preselection.
  274. \item Train MVA on MC prompt signal and recalibrate on data.
  275. \item Calibrate on date.
  276. \item Normalize to $\Lambda_c^{+} \to \Pproton K^{-} \pi^{+}$, $\Lambda_c^{+} \to \Pproton \pi^{-} \pi^{+}$ or $\Lambda_c \to \Pproton \phi(\mu \mu)$.
  277. \item Optimise the binning in MVA.
  278. \item CLs method for limit.
  279. \end{itemize}
  280. \textref {M.Chrz\k{a}szcz 2013}
  281. \end{frame}
  282.  
  283. \section{Normalization channel}
  284. \begin{frame}\frametitle{Normalization channel}
  285. \begin{itemize}
  286. \item We have 3 candidates for normalization channel.
  287. \begin{enumerate}
  288. \item $\Lambda_c \to \Pproton \phi(\mu \mu)$, $BR= (2.4 \pm 0.8) \times 10^{-7} $
  289. \item $\Lambda_c^{+} \to \Pproton K^{-} \pi^{+}$, $BR= (5.0 \pm 1.3) \times 10^{-2} $
  290. \item $\Lambda_c^{+} \to \Pproton \pi^{-} \pi^{+}$, $BR= (3.5 \pm 2.0) \times 10^{-3} $
  291. \end{enumerate}
  292. From above list $\Lambda_c \to \Pproton \phi(\mu \mu)$ is a perfect candidate for normalization.
  293. However Br is a bit low.
  294.  
  295.  
  296.  
  297. \end{itemize}
  298.  
  299.  
  300.  
  301. \textref {M.Chrz\k{a}szcz 2014}
  302. \end{frame}
  303.  
  304.  
  305.  
  306. \begin{frame}\frametitle{First look in data I}
  307. \begin{columns}
  308.  
  309. \column{2.6in}
  310. \begin{itemize}
  311. \item With some PID and vertex cuts we can see our $\Lambda_c \to \Pproton \phi(\mu \mu)$
  312. \item Back of the envelope calculations predict we should have 400 of those events in $3fb^{-1}$
  313. \item A bit small for normalization.
  314. \end{itemize}
  315. \column{2.5in}
  316. \includegraphics[scale=0.17]{new/Lc_mass_b.png}\\
  317. \includegraphics[scale=0.17]{new/Lc_mass.png}
  318.  
  319. \end{columns}
  320.  
  321.  
  322.  
  323. \textref {M.Chrz\k{a}szcz 2014}
  324. \end{frame}
  325.  
  326.  
  327. \begin{frame}\frametitle{Possible background}
  328.  
  329. \begin{center}
  330.  
  331. \begin{tabular}{| c | c | c |}
  332. \hline
  333. \textbf{ Resonance} & $\mathcal{B} (\Lambda_c \to p X)$& $\mathcal{B} (X \to \mu \mu)$\\ \hline
  334. $\eta$ & UNKNOWN & $(5.8 \pm 0.6) \times 10^{-6}$ \\ \hline
  335. $\rho^0$ & UNKNOWN & $(4.55 \pm 0.28) \times 10^{-5}$ \\ \hline
  336. $\omega$ & UNKNOWN & $(9.1 \pm 3.0) \times 10^{-5}$ \\ \hline
  337. $f(980)$ & $(2.8 \pm 1.9) \times 10^{-3}$ & UNKNOWN \\ \hline
  338. $\phi$ & $(8.2 \pm 2.7) \times 10^{-4} $ & $(2.89 \pm 0.19) \times 10^{-4}$ \\ \hline \hline
  339. \textbf{ Resonance} & $\mathcal{B} (\Lambda_c \to p X)$ & $\mathcal{B} (X \to \mu \mu \gamma)$\\ \hline
  340. $\eta$ & UNKNOWN & $(3.1 \pm 0.4) \times 10^{-4}$ \\ \hline
  341. \end{tabular}
  342. \end{center}
  343.  
  344.  
  345.  
  346.  
  347. \textref {M.Chrz\k{a}szcz 2014}
  348. \end{frame}
  349.  
  350.  
  351.  
  352. \begin{frame}\frametitle{First look in data II }
  353. \begin{columns}
  354.  
  355. \column{2.6in}
  356. \begin{itemize}
  357. \item We also have looked at dimuon spectrum.
  358. \item Clearly $\phi$, $\eta$, $\omega$ visible.
  359. \item We also see in data $\Lambda_c \to \omega(\mu \mu) \Pproton$.
  360. \end{itemize}
  361. \column{2.5in}
  362. \includegraphics[scale=0.12]{new/bck.png}\\
  363.  
  364.  
  365. \end{columns}
  366.  
  367.  
  368.  
  369. \textref {M.Chrz\k{a}szcz 2014}
  370. \end{frame}
  371.  
  372. \section{MVA}
  373. \begin{frame}\frametitle{Preliminary selection }
  374.  
  375. \begin{columns}
  376. \column{2.5in}
  377. ~Stripping:
  378. \begin{itemize}
  379. \item PID($\mu$)>-5, PID($\Pproton$) >10
  380. \item IPCHi2>9, PID($\mu -K$)>0, GHOST<0.3, PID($\Pproton$)>10, Pt>300
  381. \item $\Delta m<150MeV$
  382. \item $c\tau >100\mu m$
  383. \item $IPChi2 < 225$
  384. \end{itemize}
  385. ~Additional:
  386. \begin{itemize}
  387. \item Blind region $\vert m(p\mu\mu) - 2286.46 \vert <20 MeV$.
  388. \item $\phi$, $\omega$ veto.
  389. \end{itemize}
  390. \column{3.5in}
  391.  
  392. \includegraphics[scale=0.18]{new/Lc_mass.png}\\
  393.  
  394.  
  395.  
  396.  
  397.  
  398. \includegraphics[scale=0.2]{new/blind.png}\\
  399.  
  400. \end{columns}
  401.  
  402.  
  403.  
  404. \textref {M.Chrz\k{a}szcz 2014}
  405. \end{frame}
  406.  
  407. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%55
  408.  
  409.  
  410.  
  411. \begin{frame}\frametitle{Preliminary TMVA}
  412. \begin{columns}
  413.  
  414. \column{2.8in}
  415. \begin{itemize}
  416. \item Variables adopted form $\tau \to 3\mu$(see Marta's talk).
  417. \item In the future we will use Blending for the classifiers.
  418. \item Already thanks to this BDTG we can pick up $\Lambda_c\ \to \omega(\mu\mu) \Pproton$.
  419.  
  420. \end{itemize}
  421. \includegraphics[scale=0.2]{new/omega.png}
  422. \column{2.5in}
  423. \includegraphics[scale=0.2]{new/overtrain_BDTG.jpg}\\
  424. \includegraphics[scale=0.2]{new/rejBvsS.jpg}
  425.  
  426. \end{columns}
  427.  
  428.  
  429.  
  430. \textref {M.Chrz\k{a}szcz 2014}
  431. \end{frame}
  432.  
  433.  
  434. \section{Summary}
  435. \begin{frame}\frametitle{Summary}
  436.  
  437. \begin{itemize}
  438. \item Looks like we will have limits $\mathcal{O}(10^{-7})$ - $\mathcal{O}(10^{-8})$
  439. \item We already see a new $\Lambda_c \to \omega \Pproton$ decay!
  440. \item Normalization channel is still open, but we are converging towards $\Lambda_c^{+} \to \Pproton \pi^{-} \pi^{+}$
  441. \item We have one tight cut on the stripping (flight distance), we are considering several solutions.
  442.  
  443. \end{itemize}
  444.  
  445.  
  446. \textref {M.Chrz\k{a}szcz 2014}
  447. \end{frame}
  448. \end{document}