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\author{ {\fontspec{Trebuchet MS}Marcin Chrz\k{a}szcz} (Universit\"{a}t Z\"{u}rich)}
\institute{UZH}
\title[$R(\PLambdac^{\ast})$ measurements]{$R(\PLambdac^{\ast}$ measurements}
\date{25 September 2014}


\begin{document}
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{
\setbeamertemplate{sidebar right}{\llap{\includegraphics[width=\paperwidth,height=\paperheight]{bubble2}}}
\begin{frame}[c]%{\phantom{title page}} 
\begin{center}
\begin{center}
	\begin{columns}
		\begin{column}{0.75\textwidth}
			\flushright\fontspec{Trebuchet MS}\bfseries \Huge {$R(\PLambdac^{\ast})$ measurements}
		\end{column}
                \begin{column}{0.02\textwidth}
                  {~}
                  \end{column}
                \begin{column}{0.23\textwidth}
                 % \hspace*{-1.cm}
                  \vspace*{-3mm}
                  \includegraphics[width=0.6\textwidth]{lhcb-logo}
                  \end{column}
	        
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\end{center}
	\quad
	\vspace{3em}
\begin{columns}
\begin{column}{0.44\textwidth}
\flushright \vspace{-1.8em} {\fontspec{Trebuchet MS} \Large Marcin Chrząszcz\\\vspace{-0.1em}\small \href{mailto:mchrzasz@cern.ch}{mchrzasz@cern.ch}}

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\vspace{1em}
%		\footnotesize\textcolor{gray}{With N. Serra, B. Storaci\\Thanks to the theory support from M. Shaposhnikov, D. Gorbunov}\normalsize\\
\vspace{0.5em}

	\textcolor{normal text.fg!50!Comment}{Zurich meeting, CERN\\September 24, 2014}
\end{center}
\end{frame}
}


\begin{frame}[c]{A word on recent anomalies}
	\begin{minipage}{\textwidth}
\begin{itemize}                                                                                                                                               
\item $R(\PDstar)=\dfrac{\mathcal{B}(\PB \to \PDstar \Ptau \Pnu)}{\mathcal{B}(\PB \to \PDstar \Pmu \Pnu)}$                                                    
\item Clean SM prediction: $R(\PDstar)=0.252(3)$, PRD 85 094025 (2012)                                                                                        
\item LHCb result: $R(\PDstar)= 0.336 \pm 0.027 \pm 0.030$, HFAG average: $R(\PDstar)=0.322 \pm 0.022$                                                        
\item $3.9~\sigma$ discrepancy wrt. SM.                                                                                                                       
\end{itemize}                                                                                                                                                 
                                                                                                                                                              
\begin{center}                                                                                                                                                
                                                                                                                                                              
\includegraphics[width=0.52\textwidth]{images/RDstar.png}                                                                                                     
                                                                                                                                                              
\end{center}                                                


	\end{minipage}
		\vspace*{2.cm}
\end{frame}

\begin{frame}[c]{The idea}% is to measure the same quantity but for baryons}
	\begin{minipage}{\textwidth}
\begin{itemize}
\item The idea is to measure the same quantity but for baryons.
\item With Danny we are working on SM prediction of $R(\PLambdac^{\ast})$.
\item btw. There are 2 interesting $\PLambdac^{\ast}$: $\PLambdac^{\ast}(2595)$ and  $\PLambdac^{\ast}(2625)$.
\item Both go into $\PLambdac \pi \pi$ state.
\item They are both a part of the same doublet aka both are described by Rarita-Swinger spinor.
\item Additional measurements: $\mathcal{B}( \Lambda_b \to \PLambdac^{ast} \ell \nu$ have a experimental measurement. 
\item Ration of the two states gives info about QCD parameter that for now has large error.
\end{itemize}


	\end{minipage}
		\vspace*{2.cm}
\end{frame}


\begin{frame}[c]{The good}% is to measure the same quantity but for baryons}
	\begin{minipage}{\textwidth}
\begin{itemize}
\item For the muon mode there exist a $\PLambdab \to \PLambdac \mu \nu$ stripping line. So processes(2011 done, 2012 on the grid).
\end{itemize}
\includegraphics[width=0.95\textwidth]{images/LcSTAR.png}

	\end{minipage}
		\vspace*{2.cm}
\end{frame}


\begin{frame}[c]{The bad}% is to measure the same quantity but for baryons}
	\begin{minipage}{\textwidth}
\begin{itemize}
\item There is no stripping for the tau mode. 
\item I am running fast to meet the deadline.
\item Would be great to have both hadronic tau decay and muonic.
\end{itemize}
\includegraphics[width=0.95\textwidth]{images/LcSTAR.png}

	\end{minipage}
		\vspace*{2.cm}
\end{frame}





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