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Presentations / Lc23Mu / Status_report_04_02_15 / Lc2pll.tex
@Marcin Chrzaszcz Marcin Chrzaszcz on 3 Mar 2015 12 KB massive update
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  148.  
  149. % title slide definition
  150. \title{FCNF and L/BNV \\in $\Lambda_c$ decays}
  151. %\subtitle{a bias report}
  152. \author{ \underline{Marcin Chrz\k{a}szcz}$^{1,2}$, Tadeusz Lesiak$^{1}$, Mariusz Witek$^{1}$ }
  153. \institute[UTH]
  154. {
  155. %\begin{tiny}
  156. $ ^1$ Institute of Nuclear Physics, Krakow,\\
  157. $ ^2$ University of Zurich
  158.  
  159.  
  160. %\end{tiny}smallsmall
  161. }
  162.  
  163. \date{ \begin{small} $12^{th}$ Feb 2014 \end{small}}
  164.  
  165. %--------------------------------------------------------------------
  166. % Introduction
  167. %--------------------------------------------------------------------
  168.  
  169. \begin{document}
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  185. \includegraphics[height=1.0cm ]{pic/uzh.jpg}
  186. % \hspace{0.5cm}
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  197.  
  198. %--------------------------------------------------------------------
  199. % OUTLINE
  200. %--------------------------------------------------------------------
  201.  
  202.  
  203.  
  204.  
  205. \section[Outline]{}
  206. \begin{frame}
  207. \tableofcontents
  208. \end{frame}
  209.  
  210.  
  211.  
  212.  
  213.  
  214.  
  215.  
  216. %-------------------------------------------------------------------
  217. % Introduction
  218. %-------------------------------------------------------------------
  219. %
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  221. % Insert infoline
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  225.  
  226. \title{Report on $\tau \to p \Plepton \Plepton$}
  227.  
  228.  
  229. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  230. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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  235. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%2>%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  236.  
  237. \section{Motivation}
  238. \begin{frame}\frametitle{Why to search for $\Lambda_c \to \Pproton \mu^{+} \mu^{-}$?}
  239.  
  240.  
  241. \begin{itemize}
  242. \item Decay of $\Lambda_c^+ \to \Pproton \mu^+ \mu^-$ is a FCNC.
  243. \item Extremely suppressed in SM due to GIM mechanism.
  244. \item We will use the experience from $\tau \to \Pproton \mu \mu$.
  245.  
  246. \end{itemize}
  247.  
  248. \begin{columns}
  249. \column{2.5in}
  250. \begin{center}
  251. \includegraphics[scale=0.18]{new/FCNC.png}
  252. \end{center}
  253. ~$\mathcal{B}( \Lambda_c^{+} \to p \mu^{-} \mu^{+} ) < 4.4 \times 10^{-5}$\\
  254. ~ \@ 90\% CL arXiv:1107.4465
  255.  
  256. \column{3.5in}
  257. \includegraphics[scale=0.2]{babar.png}\\
  258. Yield: $11.1 \pm 5.0 \pm 2.5$
  259.  
  260. \end{columns}
  261.  
  262. We should easily beat Babar.
  263.  
  264. \end{frame}
  265.  
  266. \section{Strategy}
  267. \begin{frame}
  268.  
  269. \frametitle{Strategy}
  270. {~}
  271. Follow the strategy of $\tau$ analysis:
  272. \begin{itemize}
  273. \item Take prompt $\Lambda_c$, separate approach to SL.
  274. \item Loose cut preselection.
  275. \item Train MVA on MC prompt signal and recalibrate on data.
  276. \item Calibrate on date.
  277. \item Normalize to $\Lambda_c^{+} \to \Pproton K^{-} \pi^{+}$, $\Lambda_c^{+} \to \Pproton \pi^{-} \pi^{+}$ or $\Lambda_c \to \Pproton \phi(\mu \mu)$.
  278. \item Optimise the binning in MVA.
  279. \item CLs method for limit.
  280. \end{itemize}
  281.  
  282. \end{frame}
  283.  
  284. \section{Normalization channel}
  285. \begin{frame}\frametitle{Normalization channel}
  286. \begin{itemize}
  287. \item We have 3 candidates for normalization channel.
  288. \begin{enumerate}
  289. \item $\Lambda_c \to \Pproton \phi(\mu \mu)$, $BR= (2.4 \pm 0.8) \times 10^{-7} $
  290. \item $\Lambda_c^{+} \to \Pproton K^{-} \pi^{+}$, $BR= (5.0 \pm 1.3) \times 10^{-2} $
  291. \item $\Lambda_c^{+} \to \Pproton \pi^{-} \pi^{+}$, $BR= (3.5 \pm 2.0) \times 10^{-3} $
  292. \end{enumerate}
  293. From above list $\Lambda_c \to \Pproton \phi(\mu \mu)$ is a perfect candidate for normalization.
  294. However Br is a bit low.
  295.  
  296.  
  297.  
  298. \end{itemize}
  299.  
  300.  
  301.  
  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. \end{frame}
  324.  
  325.  
  326. \begin{frame}\frametitle{Possible background}
  327.  
  328. \begin{center}
  329.  
  330. \begin{tabular}{| c | c | c |}
  331. \hline
  332. \textbf{ Resonance} & $\mathcal{B} (\Lambda_c \to p X)$& $\mathcal{B} (X \to \mu \mu)$\\ \hline
  333. $\eta$ & UNKNOWN & $(5.8 \pm 0.6) \times 10^{-6}$ \\ \hline
  334. $\rho^0$ & UNKNOWN & $(4.55 \pm 0.28) \times 10^{-5}$ \\ \hline
  335. $\omega$ & UNKNOWN & $(9.1 \pm 3.0) \times 10^{-5}$ \\ \hline
  336. $f(980)$ & $(2.8 \pm 1.9) \times 10^{-3}$ & UNKNOWN \\ \hline
  337. $\phi$ & $(8.2 \pm 2.7) \times 10^{-4} $ & $(2.89 \pm 0.19) \times 10^{-4}$ \\ \hline \hline
  338. \textbf{ Resonance} & $\mathcal{B} (\Lambda_c \to p X)$ & $\mathcal{B} (X \to \mu \mu \gamma)$\\ \hline
  339. $\eta$ & UNKNOWN & $(3.1 \pm 0.4) \times 10^{-4}$ \\ \hline
  340. \end{tabular}
  341. \end{center}
  342.  
  343.  
  344.  
  345.  
  346. \end{frame}
  347.  
  348.  
  349.  
  350. \begin{frame}\frametitle{First look in data II }
  351. \begin{columns}
  352.  
  353. \column{2.6in}
  354. \begin{itemize}
  355. \item We also have looked at dimuon spectrum.
  356. \item Clearly $\phi$, $\eta$, $\omega$ visible.
  357. \item We also see in data $\Lambda_c \to \omega(\mu \mu) \Pproton$.
  358. \end{itemize}
  359. \column{2.5in}
  360. \includegraphics[scale=0.12]{new/bck.png}\\
  361.  
  362.  
  363. \end{columns}
  364.  
  365.  
  366.  
  367. \end{frame}
  368.  
  369. \section{MVA}
  370. \begin{frame}\frametitle{Preliminary selection }
  371.  
  372. \begin{columns}
  373. \column{2.5in}
  374. ~Stripping:
  375. \begin{itemize}
  376. \item PID($\mu$)>-5, PID($\Pproton$) >10
  377. \item IPCHi2>9, PID($\mu -K$)>0, GHOST<0.3, PID($\Pproton$)>10, Pt>300
  378. \item $\Delta m<150MeV$
  379. \item $c\tau >100\mu m$
  380. \item $IPChi2 < 225$
  381. \end{itemize}
  382. ~Additional:
  383. \begin{itemize}
  384. \item Blind region $\vert m(p\mu\mu) - 2286.46 \vert <20 MeV$.
  385. \item $\phi$, $\omega$ veto.
  386. \end{itemize}
  387. \column{3.5in}
  388.  
  389. \includegraphics[scale=0.18]{new/Lc_mass.png}\\
  390.  
  391.  
  392.  
  393.  
  394.  
  395. \includegraphics[scale=0.2]{new/blind.png}\\
  396.  
  397. \end{columns}
  398.  
  399.  
  400.  
  401. \end{frame}
  402.  
  403. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%55
  404.  
  405.  
  406.  
  407. \begin{frame}\frametitle{Preliminary TMVA}
  408. \begin{columns}
  409.  
  410. \column{2.8in}
  411. \begin{itemize}
  412. \item Variables adopted form $\tau \to 3\mu$(see Marta's talk).
  413. \item In the future we will use Blending for the classifiers.
  414. \item Already thanks to this BDTG we can pick up $\Lambda_c\ \to \omega(\mu\mu) \Pproton$.
  415.  
  416. \end{itemize}
  417. \includegraphics[scale=0.2]{new/omega.png}
  418. \column{2.5in}
  419. \includegraphics[scale=0.2]{new/overtrain_BDTG.jpg}\\
  420. \includegraphics[scale=0.2]{new/rejBvsS.jpg}
  421.  
  422. \end{columns}
  423.  
  424.  
  425.  
  426. \end{frame}
  427.  
  428.  
  429. \section{Summary}
  430. \begin{frame}\frametitle{Summary}
  431.  
  432. \begin{itemize}
  433. \item Looks like we will have limits $\mathcal{O}(10^{-7})$ - $\mathcal{O}(10^{-8})$
  434. \item We already see a new $\Lambda_c \to \omega \Pproton$ decay!
  435. \item Normalization channel is still open, but we are converging towards $\Lambda_c^{+} \to \Pproton \pi^{-} \pi^{+}$
  436. \item We have one tight cut on the stripping (flight distance), we are considering several solutions.
  437.  
  438. \end{itemize}
  439.  
  440.  
  441. \end{frame}
  442. \end{document}