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Presentations / Lc23Mu / Background_studies_VRD / Lc2pll.tex
@Marcin Chrzaszcz Marcin Chrzaszcz on 28 Jul 2013 12 KB update
  1. % This program can be redistributed and/or modified under the terms
  2. % of the GNU Public License, version 3.
  3. %
  4. % Seth Brown, Ph.D.
  5. % sethbrown@drbunsen.org
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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}$^{1,2}$, Johannes Albrecht$^{3}$, Tadeusz Lesiak$^{2}$, Oliver Grunberg$^{4}$ }
  151. \institute[UTH]
  152. {
  153. %\begin{tiny}
  154. $ ^1$ University of Zurich , $ ^2$ Institute of Nuclear Physics, Krakow, $ ^3$ Technische Universitaet Dortmund, $ ^4$ University of Rostock
  155. %\end{tiny}smallsmall
  156. }
  157.  
  158. \date{ \begin{small} $15^{th}$ May 2013 \end{small}}
  159.  
  160. %--------------------------------------------------------------------
  161. % Introduction
  162. %--------------------------------------------------------------------
  163.  
  164. \begin{document}
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  192.  
  193. %--------------------------------------------------------------------
  194. % OUTLINE
  195. %--------------------------------------------------------------------
  196.  
  197.  
  198.  
  199.  
  200. \section[Outline]{}
  201. \begin{frame}
  202. \tableofcontents
  203. \end{frame}
  204.  
  205.  
  206.  
  207.  
  208.  
  209.  
  210.  
  211. %-------------------------------------------------------------------
  212. % Introduction
  213. %-------------------------------------------------------------------
  214. %
  215. % Set the background for the rest of the slides.
  216. % Insert infoline
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  220.  
  221. \title{Report on $\tau \to p \Plepton \Plepton$}
  222.  
  223.  
  224. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  225. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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  230. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%2>%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  231.  
  232. \section{Motivation}
  233. \begin{frame}\frametitle{Motivation}
  234.  
  235. \begin{small}
  236. Following the success of $\tau \to 3 \mu$ and $\tau \to p \mu \mu$ (published 2 weeks ago) we decided to go one step further and analyse analogous channels for $\Lambda_c$.
  237. \begin{itemize}
  238. \item Decays have different physics motivations:
  239. \end{itemize}
  240. \begin{center}
  241. \begin{tabular}{ l | l }
  242. $\tau \to 3 \mu$ LFV & $\Lambda_c \to 3 \mu$ $|B-L|= 0$ \\
  243. $\tau^{+} \to p \mu^{-} \mu^{+} $ $|B-L|= 0$ & $\Lambda_c^{+} \to p \mu^{-} \mu^{+} $ FCNC \\
  244. $\tau^{+} \to \bar{p} \mu^{+} \mu^{+} $ $|B-L|= 0$ & $\Lambda_c^{+} \to \bar{p} \mu^{+} \mu^{+} $ $|B-L|= 0$ \\
  245. \end{tabular}
  246. \end{center}
  247.  
  248. \begin{itemize}
  249. \item The current limits ($@$ 90\% CL):
  250. \end{itemize}
  251. $\mathcal{B}( \Lambda_c^{+} \to p \mu^{-} \mu^{+} ) < 4.4 \times 10^{-5}$, arXiv:1107.4465
  252. \newline
  253. $\mathcal{B}( \Lambda_c^{+} \to \bar{p} \mu^{+} \mu^{+} ) < 9.4 \times 10^{-6}$
  254. \newline
  255. $\mathcal{B}( \Lambda_c^{+} \to 3 \mu )$ No constraints!
  256. \end{small}
  257.  
  258. \textref {M.Chrz\k{a}szcz 2013}
  259. \end{frame}
  260.  
  261. \section{Strategy}
  262. \begin{frame}
  263.  
  264. \frametitle{Strategy}
  265. {~}
  266. Follow the strategy of $\tau$ analysis:
  267. \begin{itemize}
  268. \item Take prompt $\Lambda_c$, separate approach to SL.
  269. \item Loose cut preselection.
  270. \item Train MVA on MC prompt signal and recalibrate on data.
  271. \item Mass resolution we expect similar to $\tau$. $15 MeV$ for $3 \mu$ and $9 MeV$ for $p \mu \mu$. Mean recalibrated from data.
  272. \item Normalize to $\Lambda_c^{+} \to p K^{-} \pi^{+}$, or $\Lambda_c^{+} \to p \pi^{-} \pi^{+}$.
  273. \item Optimise the binning in MVA.
  274. \item CLs method for limit.
  275. \end{itemize}
  276. \textref {M.Chrz\k{a}szcz 2013}
  277. \end{frame}
  278.  
  279. \section{Comparison $\Lambda_c$ vs $\tau$}
  280. \begin{frame}\frametitle{Comparison $\Lambda_c$ vs $\tau$}
  281. \colorbox{green}{Strong sides of $\Lambda_c$:}
  282.  
  283.  
  284. \begin{itemize}
  285. \item {No SM background in $3 \mu$ case ($\PDs \to \eta(\mu\mu\gamma) \mu \nu$)}
  286. \item {Smaller combinatorial background than in $\tau$ decays. \Simley{1} }
  287. %\item {Better prospers of observing something. Rare is better than forbidden \Simley{1} }
  288. \end{itemize}
  289.  
  290. \colorbox{red}{Weaker sides of $\Lambda_c$:}
  291. \begin{itemize}
  292. \item {Smaller no. of $\Lambda_c$ than $\tau$ to begin with.}
  293. \item {Need to study very carefully $\Lambda_c$ production and backgrounds. }
  294. \Simley{-1}
  295.  
  296. \end{itemize}
  297.  
  298.  
  299.  
  300. \textref {M.Chrz\k{a}szcz 2013}
  301. \end{frame}
  302.  
  303. \section{Work done so far}
  304. \begin{frame}\frametitle{Work done so far}
  305. \begin{itemize}
  306. \item $\Lambda_c \to p \mu \mu$ is already stripped(line was with $\tau$ line all along).
  307. \item $\Lambda_c \to 3\mu$ is being stripped in incremental stripping.
  308. \item Requested 1M signal samples. Production will today most likely.
  309. \item Background studies.
  310.  
  311. \end{itemize}
  312.  
  313. \textref {M.Chrz\k{a}szcz 2013}
  314. \end{frame}
  315.  
  316.  
  317. \begin{frame}\frametitle{Possible background}
  318.  
  319. \begin{center}
  320.  
  321. \begin{tabular}{| c | c | c |}
  322. \hline
  323. \textbf{ Resonance} & $\mathcal{B} (\lambda_c \to p X)$& $\mathcal{B} (X \to \mu \mu)$\\ \hline
  324. $\eta$ & UNKNOWN & $(5.8 \pm 0.6) \times 10^{-6}$ \\ \hline
  325. $\rho^0$ & UNKNOWN & $(4.55 \pm 0.28) \times 10^{-5}$ \\ \hline
  326. $\omega$ & UNKNOWN & $(9.1 \pm 3.0) \times 10^{-5}$ \\ \hline
  327. $f(980)$ & $(2.8 \pm 1.9) \times 10^{-3}$ & UNKNOWN \\ \hline
  328. $\phi$ & $(8.2 \pm 2.7) \times 10^{-4} $ & $(2.89 \pm 0.19) \times 10^{-4}$ \\ \hline \hline
  329. \textbf{ Resonance} & $\mathcal{B} (\lambda_c \to p X)$ & $\mathcal{B} (X \to \mu \mu \gamma)$\\ \hline
  330. $\eta$ & UNKNOWN & $(3.1 \pm 0.4) \times 10^{-4}$ \\ \hline
  331. \end{tabular}
  332. \end{center}
  333.  
  334.  
  335. \textref {M.Chrz\k{a}szcz 2013}
  336. \end{frame}
  337.  
  338.  
  339.  
  340.  
  341.  
  342. \begin{frame}\frametitle{$\Lambda_c$ production mechanism}
  343.  
  344. \begin{center}
  345.  
  346. \begin{tabular}{| c | c |}
  347. \hline
  348. \textbf{ Process} & $\mathcal{B} (X \to \lambda_c Y)$ \\ \hline
  349. $\Lambda_B \to \Lambda_c^+ \pi^{-}$ & $0.0088 \pm 0.0032$ \\ \hline
  350. $\Lambda_B \to \Lambda_c^+ \Pl \nu$ & $0.05 \pm 0.014$ \\ \hline
  351. $\Lambda_B \to \Lambda_c^+ \Pl \nu \pi \pi $ & $0.056 \pm 0.031$ \\ \hline
  352. $B \to \Lambda_c^+ \Pp \pi \pi^0 $ & $(1.8 \pm 0.6) \times 10^{-3}$ \\ \hline
  353. $B \to \Lambda_c^+ \Pp \pi \pi \pi $ & $(2.3 \pm 0.7) \times 10^{-3}$ \\ \hline
  354. $B \to \Lambda_c^+ \Lambda_c^- K^+ $ & $(8.7 \pm 3.5) \times 10^{-4}$ \\ \hline
  355. $B \to \Sigma(2455) \Pproton \pi^0 $ & $(4.4 \pm 1.8) \times 10^{-4}$ \\ \hline
  356. $B \to \Sigma(2455) \Pproton \pi \pi $ & $(4.4 \pm 1.7) \times 10^{-4}$ \\ \hline
  357. $B \to \Sigma(2455)^{--} \Pproton \pi \pi $ & $(2.8 \pm 1.2) \times 10^{-4}$ \\ \hline
  358. \hline
  359. \end{tabular}
  360. \end{center}
  361.  
  362.  
  363. \textref {M.Chrz\k{a}szcz 2013}
  364. \end{frame}
  365.  
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  376.  
  377. \begin{frame}
  378. \begin{LARGE}
  379. Backup Slides
  380. \textref {M.Chrz\k{a}szcz 2013}
  381. \end{LARGE}
  382.  
  383.  
  384.  
  385.  
  386.  
  387.  
  388. \end{frame}
  389.  
  390.  
  391.  
  392. \subsection{}
  393. \begin{frame}\frametitle{}
  394.  
  395. \includegraphics[scale=0.6]{pic/lambdaC_mass.png}
  396. \textref {M.Chrz\k{a}szcz 2013}
  397. \end{frame}
  398.  
  399.  
  400.  
  401. \begin{frame}\frametitle{}
  402.  
  403. \includegraphics[scale=0.6]{pic/comb.png}
  404. \textref {M.Chrz\k{a}szcz 2013}
  405. \end{frame}
  406.  
  407. \begin{frame}\frametitle{}
  408.  
  409. \includegraphics[scale=0.45]{pic/peaking.png}
  410. \textref {M.Chrz\k{a}szcz 2013}
  411. \end{frame}
  412.  
  413.  
  414. \end{document}