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%\title[GEANT4/EGS5]{GEANT4/EGS5}

\title{slides for Pelle's tracking talk}

\author{Sho Uemura}
\institute{SLAC}
\date[June 18, 2014]

\begin{document}

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

\begin{frame}{Pulse shape fitting}
	\begin{columns}
		\column{.6\textwidth}
		\begin{itemize}
			\item Current recon only fits single pulses, using ideal CR-RC pulse shape
			\item Need to use actual pulse shape in fit, otherwise we see time-dependent pull on fitted hit time
			\item Identify and fit pileup --- background hits before the signal hit will pull the fitted hit time to the left
				\begin{itemize}
					\item In hottest strips, mean time between hits $\approx$ pulse width
					\item Without this, need to weaken the time cut a lot --- track finding 100x slower and track efficiency still only 80\%
				\end{itemize}
			\item Good progress made in toy MC \dots in 2011 (Sho)
				\begin{itemize}
					\item Finish it off, port to Java --- 1 month?
				\end{itemize}
		\end{itemize}
		\column{.4\textwidth}
		\includegraphics[width=0.8\textwidth]{timeres_2D}

		\includegraphics[width=\textwidth]{nakahama_pileup}
		
		\includegraphics[width=0.7\textwidth]{linfit}
	\end{columns}
\end{frame}

\begin{frame}{Track finding using hit time}
	\begin{columns}
		\column{.65\textwidth}
		\begin{itemize}
			\item Current recon: reject all hits outside a time window (relative to reconstructed ECal hit time), then use a time-blind track finder
			\item Hit time resolution varies:
				\begin{itemize}
					\item Depends on relative timing of t0 and SVT clock
					\item Pileup causes some hits to have very poor time resolution
				\end{itemize}
			\item Simple plan: use hit times and resolutions to calculate a $\chi^2$ or likelihood for candidate tracks, feed into track finder
				\begin{itemize}
					\item Fun plan: ``histogram tracking'' finds high-likelihood sets of hits without prior knowledge of t0
				\end{itemize}
			\item 2 weeks?
		\end{itemize}
		\column{.35\textwidth}
		\includegraphics[width=\textwidth]{time_diff_2d}

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

\end{document}

