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\author{ {\fontspec{Trebuchet MS}M.~Chrz\k{a}szcz, R. Coutinho} (Universit\"{a}t Z\"{u}rich)}
\institute{UZH}
\title[Results and Prospects in Rare and Semi-leptonic decays]{Results and Prospects in Rare and Semi-leptonic decays}
\date{25 September 2014}


\begin{document}
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{
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\begin{center}
\begin{center}
	\begin{columns}
		\begin{column}{0.99\textwidth}
			\flushright\fontspec{Trebuchet MS}\bfseries \Huge {Results and Prospects in Rare and Semi-leptonic decays}
		\end{column}
		\begin{column}{0.01\textwidth}
		  %\includegraphics[width=\textwidth]{SHiP-2}
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	\quad
	\vspace{3em}
\begin{columns}
\begin{column}{0.44\textwidth}
\flushright \vspace{-1.8em} {\fontspec{Trebuchet MS} \Large Marcin Chrząszcz\\\vspace{-0.1em} Rafael Coutinho }

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\begin{column}{0.53\textwidth}
\includegraphics[height=1.3cm]{uzh-transp}
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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 LHCb meeting, Churwalden\\September 1-2, 2015}
\end{center}
\end{frame}
}


\begin{frame}\frametitle{Rare decays in a nutshell}

Rare decays are decays that are suppressed in the SM (forbidden on tree level, etc.)

\includegraphics[width=0.9\textwidth]{images/B-K_mumu.png}\\
\includegraphics[width=0.9\textwidth]{images/fey.png}


\begin{itemize}
\item Allow for indirect probe of NP effects.
\end{itemize}


\end{frame}
\begin{frame}\frametitle{Rare decays theory in a nutshell}
{~}\\
Typically one describes those decays in Heavy Quark Effective Field Theory(EFT) framework, where we sacrifice the beauty of substructure of the decays. The point like interaction is described by a Hamiltonian:
\begin{align*}
\mathcal{H} \sim \mathcal{M}_{CKM} \sum_i \mathcal{C}_i \mathcal{O}_i
\end{align*}

Each decay contains only a couple of operators ($\mathcal{O}$) that contribute in the decay. NP searches are done by measuring the Willson coefficients: $\mathcal{C}_i = \mathcal{C}^{SM}_i+\mathcal{C}^{NP}_i$.\\

Measurement $\mathcal{C}_i \Rightarrow$ constrains on NP models


\end{frame}

\begin{frame}\frametitle{Run1 results from UZH}

$\Rrightarrow$ Zurich group was super active in Rare decays! just to give you a hint:\\{~}\\
$\rightrightarrows$ Angular analysis of $\PBzero \to \PKstar \Pmuon \APmuon$\\
$\rightrightarrows$ Inflaton search in $\PB^{\pm} \to \PK^{\pm} \chi(\mu\mu)$\\
$\rightrightarrows$ Moments analysis of $\PBzero \to \PKstar(14X0) \Pmuon \APmuon$\\
$\rightrightarrows$ Lepton flavour violation search for $\Ptau \to \mu \mu \mu$.\\
$\rightrightarrows$ Kaggle competition for LHCb.\\
$\rightrightarrows$ The "holy grail" of LHCb $\PBs \to \Pmuon \APmuon$.\\


\end{frame}



\begin{frame}\frametitle{Angular analysis of $\PBzero \to \PKstar \Pmuon \APmuon$\\\begin{small}
\texttt{N.Serra, M.Chrzaszcz, E.Bowen, B.Storaci, M.Tresh }
\end{small}}
\begin{columns}
\column{0.6\textwidth}
\begin{itemize}
\item Huge impact of the group!
\item We were involved there from the start: pre-selection, BDT, etc.
\item One of the three methods (MoM) is fully and exclusivelly ours.
\item Separate paper about the method published: \href{http://arxiv.org/abs/1503.04100}{Phys. Rev. D 91, 114012 (2015)}
\item Paper is in the final stage of the review.
\end{itemize}


\column{0.4\textwidth}
\includegraphics[angle=-90,width=0.9\textwidth]{images/P5pPad.pdf}\\
\includegraphics[angle=-90,width=0.9\textwidth]{images/AFBPad.pdf}
\end{columns}

\only<2>{
$\Rrightarrow$ ''Take a moment and discover New Physics''

}

\end{frame}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{frame}\frametitle{Inflaton analysis: $\PBplus \to \PKplus \chi(\mu\mu)$\\ \texttt{\begin{small} A.Mauri, N.Serra, M.Chrzaszcz \end{small}}}
\begin{columns}
\column{0.02\textwidth}
{~}

\column{0.47\textwidth}
\begin{itemize}
\item Analysis completely done by UZH!
\item All the strategy is defined.
\item Backgrounds understood.
\item Soon ready for WG review.
\item Main part of Andrea PhD.

\end{itemize}

\column{0.47\textwidth}
\includegraphics[width=0.9\textwidth]{images/eff.png}\\
\includegraphics[width=0.9\textwidth]{images/bkg.png}

\column{0.02\textwidth}
{~}
\end{columns}



\end{frame}     

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{frame}\frametitle{ Moments analysis of $\PBzero \to \PKstar(14X0) \Pmuon \APmuon$\\ \texttt{\begin{small} E.Bowen, N.Serra, B.Dey \end{small}}}
\begin{columns}
\column{0.02\textwidth}
{~}

\column{0.47\textwidth}
\begin{itemize}
\item Analysis progressing well.
\item Espen finished acceptance.
\item Cross-checked with normal  $\PB \to \PKstar \Pmuon \APmuon$.
\item Observables never measured before!
\item Soon in WG review.

\end{itemize}

\column{0.47\textwidth}
\includegraphics[angle=-90,width=0.9\textwidth]{images/mX.pdf}\\
\includegraphics[angle=-90,width=0.9\textwidth]{images/D02_pull.pdf}

\column{0.02\textwidth}
{~}
\end{columns}



\end{frame}    

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%5
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{frame}\frametitle{Lepton flavour violation search for $\Ptau \to \mu \mu \mu$.\\ \texttt{\begin{small} M.Chrzaszcz, N.Serra \end{small}}}
\begin{columns}
\column{0.02\textwidth}
{~}

\column{0.47\textwidth}
\begin{itemize}
\item Analysis published in February.
\item In parallel HFAG report was prepared.
\item We got the best limit: $\mathcal{B}(\tau \to 3\mu) <1.2 \times 10^{-8}$
\begin{alertblock}{Some stats:}
\begin{itemize}
\item Till now HFAG report has 73 citations!
\item All $\tau$ section citations are on $\tau \to 3\mu$!
\end{itemize}
   \end{alertblock}

\end{itemize}

\column{0.47\textwidth}
\includegraphics[angle=-90,width=0.9\textwidth]{images/bananaB.pdf}\\
\includegraphics[angle=-90,width=0.9\textwidth]{images/banana_tau23mu.pdf}

\column{0.02\textwidth}
{~}
\end{columns}



\end{frame}    

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{frame}\frametitle{The "holy grail" of LHCb $\PBs \to \Pmuon \APmuon$\\ \texttt{\begin{small} C.Elsasser \end{small}}}
\begin{columns}
\column{0.02\textwidth}
{~}

\column{0.47\textwidth}
\begin{itemize}
\item Christian main job was the calibration of the BDT.
\item Analysis was latter combined with the CMS one.


\end{itemize}
\includegraphics[width=0.9\textwidth]{images/bs1.png}
\column{0.47\textwidth}
\includegraphics[width=0.9\textwidth]{images/bs2.png}

\column{0.02\textwidth}
{~}
\end{columns}



\end{frame}   


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{frame}

\begin{Huge}
Prospects for the future
\end{Huge}

\end{frame}  

\begin{frame}\frametitle{Run2 data}
$\Rrightarrow$ We should be prepared for Run2 data, however:
\begin{itemize}
\item Run1 is still not fully exploited!
\item Analysis are still ongoing.
\item Run2 data will be usable when we collect ($ \sim 2$) times the statistics of Run1.
\item Finally Run1 data is understood, Run2 is an unexplored land.
\end{itemize}

$\Rrightarrow$ To sum up: For another year or two we will still use the Run1 data for most of the NP searches.

\end{frame} 

\begin{frame}\frametitle{Plans for the future?}
$\Rrightarrow$ So let's list the hints of NP we have:
\begin{itemize}
\item The famous $P_56{\prime}$ anomaly ($3.7~\sigma$).
\item The $R_k$ anomaly ($2.7~\sigma$). 
\item The $R(\PDstar)$ anomaly ($2.1~\sigma$)\footnote{This anomaly was also observed by Babar and Belle with $2.7~\sigma$ and $2.0\sigma$ significance.}.
\end{itemize}
$\Rrightarrow$  For fun let's assume that these anomalies are not just statistics fluctuation but nature showing its true face. 

\begin{itemize}
\item All hints point out that there is clear indication that NP clearly violates lepton universality.
\item There is also a clear hierarchical structure.
\item So what to do with that?
\end{itemize}


\end{frame}

\begin{frame}\frametitle{Lets pin down NP now!}


$\Rrightarrow$ Some ideas what we can do:
\begin{itemize}
\item If the NP accrues in the $R_k$, it might also occur in the angular observables! $\Rightarrow$ Lets measure difference in observables like $P_5^{\prime,~\mu} - P_5^{\prime~e}$.
\item In the $\tau$ sector the NP is competing with a SM tree decay! We could measure: $R(\PLambda_c^{\ast})$\footnote{Please remember that protons kill a lot of background. The main criticism on $R(\PDstar)$ analysis is the background modelling}.
\item If there exists LU breaking, one cloud also see LFV like: $\PB \to \PK \Plepton \Plepton^{\prime}$, like: $\PBplus \to \PKplus \Pmu \Pe$.
\item Now playing the devils advocate: Maybe we are remodelling the $\PBzero \to \PKstar \Pmu \Pmu$? One could measure the partial and higher moments in this channel as well in $\PB \to \PK \Pe \Pe$, Collaboration with Roman Zwicky and Greg Cowan~\footnote{My personal opinion, we should keep as much of MoM in UZH as possible.}.
\end{itemize}

\end{frame}


\begin{frame}\frametitle{Lets pin down NP in run2 data}
$\Rrightarrow$ Some ideas what we could do with the full Run2 data:
\begin{itemize}
\item Well $\tau$s are more sensitive, we could start thinking of: $\PB \to \PK(\PKstar) \Ptau \Ptau$.
\item We should definitely update $\tau \to 3\mu$. 
\item Some more Semi-leptonic measurements!
\end{itemize}


\end{frame}

\begin{frame}\frametitle{Summary}


\begin{enumerate}
\item Run1 data analysis program is still rich in NP searches.
\item Many analysis are in the pipe line. 
\item We should maximize the coverage of the mentioned topics.
\end{enumerate}


\end{frame}

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