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Presentations / HQL_2014 / Rare_decays / Lc2pll.tex
@mchrzasz mchrzasz on 25 Aug 2014 10 KB adde talks
  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
  6. %
  7. % Compiled with XeLaTeX
  8. % Dependencies:
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  140.  
  141. % see the macros.tex file for definitions
  142. \include{macros }
  143.  
  144. % title slide definition
  145. \title{$\Lambda_c \to p \mu \mu$ , $\Lambda_c \to \mu \mu \mu$}
  146. %\subtitle{a bias report}
  147. \author{Johannes Albrecht$^{1}$, \underline{Marcin Chrz\k{a}szcz}$^{2,3}$, Tadeusz Lesiak$^{3}$, Oliver Grunberg$^{4}$}
  148. \institute[UTH]
  149. {
  150. $ ^1$ Technische Universitaet Dortmund \\
  151. $ ^2$ University of Zurich \\
  152. $ ^3$ Institute of Nuclear Physics, Krakow \\
  153. $ ^4$ University of Rostock \\
  154. }
  155.  
  156.  
  157.  
  158. \date{$8^{th}$ May 2013}
  159.  
  160. %--------------------------------------------------------------------
  161. % Introduction
  162. %--------------------------------------------------------------------
  163.  
  164. \begin{document}
  165.  
  166.  
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  177. \titlepage
  178.  
  179. \begin{center}
  180. % \includegraphics[height=1.0cm ]{pic/uzh.jpg}
  181. % \hspace{0.5cm}
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  184. \includegraphics[height=1.0cm]{pic/ifj.png}
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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
  217. \setbeamertemplate{background}
  218. {\includegraphics[width=\paperwidth,height=\paperheight]{slide_bg}}
  219. \setbeamertemplate{footline}[bunsentheme]
  220.  
  221. \title{Report on $\tau \to p \Plepton \Plepton$}
  222.  
  223.  
  224. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  225. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  226.  
  227. \setbeamertemplate{background}
  228. {\includegraphics[width=\paperwidth,height=\paperheight]{slide_bg}}
  229. \setbeamertemplate{footline}[bunsentheme]
  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 2012}
  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 on $\Lambda_c^{+} \to p K^{-} \pi^{+}$.
  272. \item Normalize to $\Lambda_c^{+} \to p K^{-} \pi^{+}$.
  273. \item Optimise the binning in MVA.
  274. \item CLs method for limit.
  275. \end{itemize}
  276.  
  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.  
  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 start next weak.
  309. \item Background studies. (see backup slides).
  310.  
  311. \end{itemize}
  312.  
  313.  
  314.  
  315.  
  316. \end{frame}
  317.  
  318. \begin{frame}
  319. \begin{LARGE}
  320. Backup Slides
  321. \end{LARGE}
  322.  
  323.  
  324.  
  325.  
  326.  
  327.  
  328. \end{frame}
  329.  
  330.  
  331.  
  332. \subsection{}
  333. \begin{frame}\frametitle{Work done so far}
  334. \begin{itemize}
  335. \item $\Lambda_c \to p \mu \mu$ is already stripped(line was with $\tau$ line all along).
  336. \item $\Lambda_c \to 3\mu$ is being stripped in incremental stripping.
  337. \item Requested 1M signal samples. Production will start next weak.
  338. \item Background studies. (see backup slides).
  339.  
  340. \end{itemize}
  341.  
  342.  
  343.  
  344. \end{frame}
  345.  
  346.  
  347.  
  348.  
  349.  
  350.  
  351.  
  352.  
  353.  
  354.  
  355.  
  356.  
  357. \end{document}