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\author{ {\fontspec{Trebuchet MS}Marcin Chrz\k{a}szcz, Katharina M\"{u}eller} (UZH)}
\institute{UZH}
\title[Low Mass Drell-Yan Status Report ]{Low Mass Drell-Yan Status Report }
\date{7 September 2015}


\begin{document}
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{
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\begin{center}
\begin{center}
	\begin{columns}
		\begin{column}{0.75\textwidth}
			\flushright\fontspec{Trebuchet MS}\bfseries \Huge {Low Mass Drell-Yan Status Report }
		\end{column}
                \begin{column}{0.02\textwidth}
                  {~}
                  \end{column}
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                 % \hspace*{-1.cm}
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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} Katharina M\"{u}eller Nicola Chiapolini}

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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}{Analysis and Software Week, CERN\\January 27, 2016}
\end{center}
\end{frame}
}


\begin{frame}\frametitle{Introduction to Drell-Yan}

\begin{columns}
\column{2.5in}
\begin{itemize}
\item Drell-Yan are process of two quark anihilations in which neutral current couples to two leptons.
\item The cross section of this process depends on two components:
\begin{itemize}
\item Hard scattering process $\color{OrangeRed}{\Rrightarrow}$ NNLO pQCD.
\item Parton Distribution Function (PDF).
\end{itemize}
\item Measurement of the cross section have a high sensitivity to the PDF
\item Due to unique coverage $2<y<5$ LHCb probes the $Q^2-x$ region not covered by other experiments.

\end{itemize}

\column{2.5in}
\includegraphics[width=0.95\textwidth]{images/feynmanDiagram_DrellYan_wRad.png}\\
\includegraphics[width=0.85\textwidth]{images/Q2_x.png}

\end{columns}


\end{frame}


\begin{frame}\frametitle{Selection}

\begin{columns}
\column{2.5in}
\begin{itemize}
\item Analysis moved to stripping 20.
\item Plan is to measure separately $7~\TeV$ and $8~\TeV$ data.
\item In addition we will provide the ratio of both samples), where many systematic cancel.
\item Overall observed a good agreement between 2011 and 2012 data.
\item Requested large MC sample to reduce the systematics errors.
\item Analysis aims at DIS 2016.
\end{itemize}

\column{2.5in}
\includegraphics[width=0.95\textwidth]{images/mumu_iso_yeartrig_sig.png}\\
\includegraphics[width=0.95\textwidth]{images/mumu_iso_yeartrig.png}\\


\end{columns}

\end{frame}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{frame}\frametitle{Isolation}
\begin{itemize}
\item Drell-Yan unfortunately do not peak in mass $\twoheadrightarrow$ need another variable to control the purity.
\item Find mass independent isolation variable such that the signal template can be determined from data. 
\item We define an isolation variable:
\begin{align*}
\mu_{ {\rm{iso}}} = \log(p_T^{ cone}(\mu, 0.5) - p_T^{ cone}(\mu, 0.1))
\end{align*}
\item For two muons we take the maximum of the two isolations:
\begin{align*}
\mu\mu_{ {\rm{iso}}} = \max( \mu_{ {\rm{iso}}}^+, \mu_{ {\rm{iso}}}^-)
\end{align*}
\end{itemize}
\begin{center}
\begin{columns}
\column{0.5\textwidth}
\includegraphics[angle=-90,width=0.9\textwidth]{images/Z0_iso.pdf}
\column{0.5\textwidth}
\includegraphics[width=0.8\textwidth]{images/iso.png}
\end{columns}

\end{center}
\end{frame}


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


\begin{frame}\frametitle{Conclusions}
\begin{itemize}                     
\item Analysis strategy finalized.
\item Aim: DIS 2016
\item Early 2016: WG sign off.


\end{itemize}  
\end{frame}   

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\end{document}