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Abstract On Selection Performance

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\section{Selection Performance} All the selection steps have been designed using MC simulation, and show a good agreement with the data. Additionally, the selection efficiency and purity as a function of each step are shown schematically in~\cref{fig:EvtSel_SelEffPur}. The BDT cut massively enhanced the purity of the positron selection as shown in~\cref{fig:EvtSel_EffPurParticleNue}. Although the veto cuts reduced the positrons efficiency and purity, they have increased the purity and efficiency of the electron-antineutrino selection by removing the positrons coming from the gammas as shown in~\cref{fig:EvtSel_EffPurNueSimpletopo}. \begin{figure}[H] \begin{subfigure}[b]{0.45\textwidth} \begin{center} \includegraphics[scale = …show more content…

\begin{figure}[H] \begin{subfigure}[b]{0.45\textwidth} \begin{center} \includegraphics[scale = 0.35]{./Include/EvtSel_MomDist.png} \caption{Momentum distribution.} \label{fig:EvtSel_MomDist} \end{center} \end{subfigure} \hspace{1cm} \begin{subfigure}[b]{0.45\textwidth} \begin{center} \includegraphics[scale = 0.35]{./Include/EvtSel_CosDist.png} \caption{$\cos\theta$ distribution.} \label{fig:EvtSel_CosDist} \end{center} \end{subfigure} \caption{Momentum (left) and $\cos \theta$ distributions for events passing all cuts. Data (in black dots) with its statistical uncertainty overlays the MC simulation (in coloured histograms).} \label{fig:EvtSel_MomCosDist} \end{figure} Furthermore, the purity and efficiency as a function of the particle true momentum of the MC simulation is shown in~\cref{fig:EvtSel_MomCosDist}. Which indicate a low efficiency at low particle's momentum due to detector limitation. For instance, a low momentum positron may not have the sufficient TPC number of hits, or may suffer from charge mis-reconstruction. \begin{figure}[H] \centering \includegraphics[scale = 0.35]{./Include/EvtSel_EffPurMom.png} \caption{Efficiency (in blue) and purity (in red) of the selection as a function of the true momentum of the particle .} \label{fig:EvtSel_MomDist} \end{figure} \section{Surviving Background} Even after all the selection cuts, explained above, some background can still survive. The sources,

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