BadRunList.tex

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\chapter{Bad run list}\label{chap:badRunList}

Diffractive analyses~\cite{AnalysisNoteRafal,AnalysisNoteLukasz} were performed with the use of data from runs with completion status ``Successful'' in the STAR run log~\cite{RunLog}. During analysis of these runs no problems with the reconstructed data were found. The distributions of the TPC track-related quantities and performance of remaining subsystems used in analyses did not indicate issues preventing this data from inclusion to physics analyses. There were runs with one dead TPC sector (up tp 16073059), but in this case we calculated separate efficiency corrections for runs with and without this issue (see Subsec.~\ref{subsec:sampleTpcEffPlots}).

We omitted from analyses data taken with Roman Pot detectors far from their typical positions. By the position we understand the vertical distance between the nominal beam trajectory and the closest edge of the Silicon Strip Detector housed inside Roman Pot. These positions were first measured during dedicated survey~\cite{surveyNote} and later precisely calculated for all runs and for all detectors using elastic proton-proton scattering events~\cite{alignmentPresentation,alignmentDirectory}.%~\cite{alignmentPresentation, alignmentNote, alignmentDirectory}.

Below we show histogram (Fig.~\ref{fig:positionHistograms}) and graph (Fig.~\ref{fig:positionVsRunGraph}) of the beam-detector distance of all Roman Pots during runs\footnote{Roman Pots were not moved during the run. They were only moved between the runs.} with active RP triggers. Based on these plots we set the limit on the actual position of the detector with respect to the beam to $y_{\text{thr}} =$~34~mm. If any of 8 detectors was further from the beam than the threshold ($|y|>y_{\text{thr}}$) the run run was omitted from analysis. The benefit of that selection was reduction of the systematic effects related to low/asymmetric acceptance of detectors when they are at far/significantly differing distances from the nominal beam trajectory.

In the Fig.~\ref{fig:rpPosition} one can notice that there were a few runs (16106026-16106033, fill 18915) with the closer-than-typical distance of detectors to the beamline. These runs correspond to a period dedicated for a study of elastic proton-proton scattering when an enhanced sample of RP\_ET triggers was collected. % There is no significant difference in beam conditions that these data were taken with. The main characteristics is that there were multiple vernier scans conducted during the RHIC fill for better precision in luminosity determination. 
For this particular process it was important to collect data with maximally reduced detector distance to the beamline and have continuous support of the Roman Pot experts in the control room throughout the runs. Although detector positions differ from the typical for these few runs, the active area of Roman Pots still covered the fiducial area defined for a physics measurement described in this note. We therefore preserve these runs. 

%--------------------------
\begin{figure}[hb]
\centering
\parbox{0.4\textwidth}{
  \centering
  \begin{subfigure}[b]{\linewidth}{
                \subcaptionbox{\label{fig:positionHistograms}}{\includegraphics[width=\linewidth]{graphics/badRuns/positionHistograms.pdf}}}
  \end{subfigure}
}
\quad
\parbox{0.545\textwidth}{
  \centering
  \begin{subfigure}[b]{\linewidth}{
                \subcaptionbox{\label{fig:positionVsRunGraph}}{\includegraphics[width=\linewidth]{graphics/badRuns/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:rpPosition}
\end{figure}
%---------------------------

A summary list of runs in which detector positions did not fulfill beam-detector distance limits are listed below:%
%
\begin{center}
\begin{tabular}{llllll}
16053043 & 16055121 & 16065025 & 16065026 & 16065027 & 16065028\\
16072057 & 16072058 & 16077055 & 16083006 & 16083007 & 16106031\\
\end{tabular}
\end{center}%
%
Full list of runs with diffractive triggers (``RP\_xxxx'') and the list of runs for each trigger can be found at the web adress given in Ref.~\cite{onlineRpTriggersMonitoring}.