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Dataset.tex.backup
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%%===========================================================%%
%% %%
%% DATASET %%
%% %%
%%===========================================================%%
\chapter{Data set}\label{chap:dataset}
\section{Trigger}\label{seq:trigger}
The main trigger designed for studies of Central Diffraction in run 15 was RP\_CPT2. It was formed of the following conditions combined by logical AND (\&\&):
\begin{enumerate}
\item \textbf{(ET \&\& !IT) $||$ (!ET \&\& IT)} = signal in at least one RP on each side of the STAR central detector - to ensure presence of two forward-scattered protons; a veto was imposed on simultaneous signal in RPs above and below the beamline, which might have originated either from proton dissociation, or pile-up event, or beam halo proton etc.,
\item \textbf{!BBCE \&\& !BBCW \&\& !ZDCE \&\& !ZDCW} = veto on any signal in small BBC tiles or ZDCs on any side of STAR central detector - such requirement is in accordance with the double-gap topology of CEP events, it mostly filtered out CEP events with parallel pile-up event(s),
\item \textbf{TOF$\geq$2} = at least 2 hits in TOF - aim of this condition was to ensure activity in the mid-rapidity; since the lowest multiplicity allowed in CEP is 2, that was the lower threshold of L0 TOF multiplicity.
\end{enumerate}%
This trigger was running with an average prescale of 5 and average DAQ rate of 250~Hz, which allowed to collect in total about 560~M events corresponding to 16.5~pb$^{-1}$ of integrated luminosity. More information about number of events per run, rates etc. can be found under link provided in Ref.~\cite{onlineRpTriggersMonitoring}, which contains selected data from STAR run log~\cite{RunLog}. Luminosity data used in this analysis comes from Ref.~\cite{Luminosity}.
All RP triggers which were intended for usage in diffractive physics analyses or efficiency studies are listed in Tab.~\ref{tab:triggers}. Components used in definitions of these triggers are outlined in Fig.~\ref{fig:triggerBits}. Detailed explanation of all trigger bits can be found in Refs.~\cite{RpTriggers,RpTriggers2}. Explanation of naming convention in Roman Pot system can be found in Ref.~\cite{Labeling}.
\begin{figure}[h]
\centering%
\includegraphics[width=0.71\linewidth]{graphics/dataset/bits.png}%
\caption{Sketch of the trigger components used in definitions of diffractive triggers in run 15.}\label{fig:triggerBits}%
\end{figure}
\begin{table}[hb!]\centering
\begin{tabular}{l|c|c|c}%\hline
\textbf{\specialcell{Trigger\\name}} & \textbf{Definition} & \textbf{\specialcell{Events [M]\\(available)}} & \textbf{Comment} \\ \hline
RP\_CP & {EOR \&\& WOR} & 73.3 (46.0) & \specialcell{Loose trigger (mostly elastic events) designed\\for monitoring/trigger efficiency study}\\ \hline
RP\_CPT & {\specialcell{\specialcell{EOR \&\& WOR\\ \&\& !BBCE \&\& !BBCW} \\ \specialcell{\&\& !ZDCE \&\& !ZDCW} \\ \&\& TOF$\geq$1}} & 38.9 (0.0) & \specialcell{Intended to be main CEP trigger (later\\switched to RP\_CPT2 due to large prescale)}\\ \hline
RP\_CPT2 & {\specialcell{\specialcell{(ET \&\& !IT) $||$ (!ET \&\& IT) \\ \&\& !BBCE \&\& !BBCW} \\ \specialcell{\&\& !ZDCE \&\& !ZDCW} \\ \&\& TOF$\geq$2}} & 556.5 (493.8) & \specialcell{Main CEP trigger\\Note: On Apr 14 added upper TOF limit (10)} \\ \hline
RP\_CPX & {\specialcell{\specialcell{IT\\ \&\& !BBCE \&\& !BBCW} \\ \specialcell{\&\& !ZDCE \&\& !ZDCW} \\ \&\& TOF$\geq$2}} & 40.1 (0.0) & \specialcell{The same as RP\_CPT2\\but only IT configuration}\\ \hline
RP\_CPEI & {\specialcell{\specialcell{ET \&\& IT\\ \&\& !BBCE \&\& !BBCW} \\ \specialcell{\&\& !ZDCE \&\& !ZDCW} \\ \&\& TOF$\geq$2}} & 15.6 (11.8) & \specialcell{Control trigger for CPT2 to estimate\\ effect of !(ET \&\& IT) veto } %\\ \hline
\end{tabular}\caption{Central Diffraction physics triggers and control triggers involving Roman Pot detectors in run 15.}\label{tab:triggers}
\end{table}
\section{Reconstruction software}\label{sec:recoSoftware}
Raw data was processed with STAR libraries in versions SL15f. All four trigger datasets were processed: production\_pp200trans\_2015, production\_pp200long2\_2015, production\_pp200long3\_2015 and production\_pp200long\_2015 (see~\cite{ProductionList}).
The following BFC options were used in the reconstruction:\vspace{-10pt}
\begin{verbatim}
DbV20160418,pp2015c,btof,mtd,mtdCalib,pp2pp,-beamline,beamline3D,useBTOFmatchOnly,VFStoreX,
fmsDat,fmsPoint,fpsDat,BEmcChkStat,-evout,CorrX,OSpaceZ2,OGridLeak3D,-hitfilt
\end{verbatim}
Main attention should be put on option \textbf{useBTOFmatchOnly} which
\section{Data format}\label{sec:dataFormat}
The analyzed data was stored in ROOT files in the picoDST format which was in large part a skimmed MuDST (standard STAR format). The picoDST format was introduced in Ref.~\cite{PicoDstDescription}. PicoDST description files (C++ headers etc.) can be found in the analysis code repository~\cite{AnalysisCodeRepo}.
\section{Bad runs}\label{sec:badRuns}
Analysis of CEP was performed on the data from runs with completion status ``Successful'' in the STAR run log. However, based on additional requirements explained below, some runs were omitted from analysis.
\subsection{RP distance from the beamline}
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%---------------------------
\begin{figure}[hb]
\centering
\parbox{0.4\textwidth}{
\centering
\begin{subfigure}[b]{\linewidth}{
\subcaptionbox{\label{fig:positionHistograms}}{\includegraphics[width=\linewidth]{graphics/dataset/positionHistograms.pdf}}}
\end{subfigure}
}
\quad
\parbox{0.545\textwidth}{
\centering
\begin{subfigure}[b]{\linewidth}{
\subcaptionbox{\label{fig:positionVsRunGraph}}{\includegraphics[width=\linewidth]{graphics/dataset/positionVsRunGraph.pdf}}}
\end{subfigure}
}%
\caption[Beam-detector distance of the Roman Pots in run 15.]{Histogram of beam-detector distance $|y|$ (\ref{fig:positionHistograms}) and graph showing run-dependence of $|y|$ (\ref{fig:positionVsRunGraph}) for all Roman Pots.}%\label{fig:xy_recoEff}
\end{figure}
%---------------------------