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\title{Vertex tails and kinks}

\author{Sho Uemura}
% \institute{SLAC}
\date[August 16, 2013]

\begin{document}

\begin{frame}
	\titlepage
\end{frame}


\begin{frame}{Vertex tails}
	\begin{columns}
		\column{0.6\textwidth}
		\begin{itemize}
			\item Matt sees tails at large vertex Z even after killing fake hits
			\item So, examine a sample of tail events (prompt A' events with basic track cuts and hit isolation cut, plus the Z cut)
		\end{itemize}
		\column{0.4\textwidth}
		\includegraphics[width=\textwidth]{vertex_tails}
	\end{columns}
\end{frame}

\begin{frame}{Kinks}
	\begin{itemize}
		\item Select MCParticles with hits in 8 or more layers
		\item Get Y and Z for each SimTrackerHit, calculate angle of track segments from one layer to the next; assume track starts at (0, 0)
		\item Deflection = (change in angle)*(sign of angle)
		\item Find the largest-magnitude deflection in each event
	\end{itemize}
\end{frame}

\begin{frame}{Results}
	\begin{columns}
		\column{0.5\textwidth}
		\begin{itemize}
			\item Tail events have big deflections in the first layers, and these deflections are away from the beam
				\begin{itemize}
					\item Exactly what you need to pull the vertex to +Z
				\end{itemize}
			\item Most of these don't appear to be hard scatters; the largest scatter is a hard scatter (hit is near the origin of a secondary particle) about 10\% of the time for both tail and normal events
		\end{itemize}
		\column{0.5\textwidth}
		\includegraphics[width=\textwidth]{deflection_layer_largestE}

		\includegraphics[width=\textwidth]{layer_largestE}

		\includegraphics[width=\textwidth]{deflection_largestE}
	\end{columns}
\end{frame}

\end{document}

