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\title[$B\rightarrow K\tau\tau$ search in $b\rightarrow K \mu\mu$ decays
]{$B\rightarrow K\tau\tau$ search in $B\rightarrow K \mu\mu$ decays}
%\subtitle{Subtitle here}
\author{Sascha Liechti\\
Supervisors: Nicola Serra, Patrick Owen}
\institute{University of Zurich - LHCb group}
\date{}


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\begin{frame}[plain]
\titlepage
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\begin{frame}[plain]{Overview}\vspace{4pt}
\begin{enumerate}
\item Decay
\item Search
\begin{itemize}
\item Theory
\item Pdf and its parts
\item Where we are now
\end{itemize}
\item Outlook
\end{enumerate}
\vspace{80pt}

\tiny{All results and plots are very preliminary}
\end{frame}

\begin{frame}[t]{Decay} \vspace{4pt}

\begin{itemize}
\item Anomalies gave rise to new search for possible lepton flavor universality violation
\begin{itemize}
\item Different couplings to leptons of different generations \\
$\triangleright$ Most to $\tau$, least to $e$
\end{itemize}
\item[$\triangleright$] How can we observe different generations at once?
\end{itemize}
\begin{columns}
\column{0.49\textwidth}{
\includegraphics[width = 0.9\textwidth]{img/full_decay.png}
}
\column{0.49\textwidth}{
\includegraphics[width = 0.9\textwidth]{img/b_to_s.png}
}
\end{columns}

\end{frame}

\begin{frame}[t]{Search} \vspace{4pt}

\begin{itemize}
\item According to SM the $\tau$ contribution should not be visible in the dimuon spectrum
\begin{itemize}
\item Dependent on Wilson coefficients ($C7$), $C9$, $C10$
\end{itemize}
\item[$\triangleright$] Some SUSY models predict an amplification of the $\tau$ contribution:
\begin{itemize}
\item[$\triangleright$] Amplification due to new channel
\item[$\triangleright$] Amplification factor: \textbf{10 - 1000}
\end{itemize}
\item[$\Rightarrow$] $\tau$ contribution should become visible
\begin{itemize}
\item Cusp like shape in between $J/\Psi$ and $\Psi(2S)$ resonances
\item At the moment still a bifurkated gaussian\\
(shape will slightly change once we get the exact shape)
\end{itemize}
\end{itemize}

\end{frame}

\begin{frame}[t]{Search} \vspace{4pt}
\includegraphics[width = 0.9\textwidth]{img/pdf_and_parts-full.png}
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\begin{frame}[t]{Search} \vspace{4pt}
\begin{columns}
\column{1.06\textwidth}{
Extremely sensitive to cusp amplitude\vspace{10pt}
}
\end{columns}
\begin{columns}
\column{0.5\textwidth}{
Cusp amplitude: $6\cdot 10^{-7}$\vspace{4pt}
\includegraphics[width = 1.0\textwidth]{img/histo.png}}
\column{0.5\textwidth}{
Cusp amplitude: $4\cdot 10^{-7}$\vspace{4pt}
\includegraphics[width = 1.0\textwidth]{img/histo-low-cusp.png}}
\end{columns}
\end{frame}

\begin{frame}[t]{Search} \vspace{4pt}
What can we do for now:
\begin{itemize}
\item Generate toys (equivalent size of data taken in run I and II)
\item Running model of the dimuon spectrum and the relevant contributions for this search
\begin{itemize}
\item Rare nonresonant
\item $J/\Psi$
\item $\Psi(2S)$
\item $Cusp$
\item Will be added in the future: $cc$, $B \rightarrow DDK$, $DD^*K$, $ D^*D^*K$
\end{itemize}
\item Binned fit pdf to the data and calculate likelihood
\end{itemize}
\end{frame}

\begin{frame}[t]{Outlook} \vspace{4pt}
Next steps:
\begin{itemize}
\item Integrate true shape of the cusp
\item Add $cc$, $B \rightarrow DDK$, $DD^*K$, $ D^*D^*K$\\
$\triangleright$ Only $B \rightarrow DD^*K$ nonresonant
\item Implement additional crosschecks
\item Analyze resolution
\item Low energy regime fit:
\begin{itemize}
\item[$\triangleright$] Improve sensitivity on $c$ part and $\tau$ tail by including a constraint from low $q^2$
\end{itemize}
\end{itemize}
\end{frame}

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\begin{frame}[standout] \vspace{4pt}
\includegraphics[width = 0.6\textwidth]{img/questions.jpg}
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\begin{frame}[t]{Backup Slides} \vspace{4pt}
\includegraphics[width = 1.0\textwidth]{img/histo-full.png}
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\begin{frame}[t]{Backup Slides} \vspace{4pt}
\includegraphics[width = 1.0\textwidth]{img/pdf_and_parts-center.png}
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\end{document}