--- /dev/null
+\documentclass{JACoW-GSI-2014}
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+%% GSI Scientific Report 2013
+%% \setlength{\titleblockheight}{27mm} KG
+\setlength{\titleblockheight}{35mm}
+
+\begin{document}
+\title{Background rejection in dilepton analysis with CBM-MVD\thanks{This work has been supported by BMBF (05P12RFFC7), HIC for FAIR, HGS-HIRe, H-QM, and GSI.}}
+
+\author[1]{E. Krebs}
+\author[2]{T. Galatyuk}
+\author[ ]{J. Stroth\textsuperscript{\normalfont 1,3} for the CBM collaboration}
+\affil[1]{Goethe-Universit\"at, Frankfurt, Germany}
+\affil[2]{Technische Universit\"at Darmstadt, Germany}
+\affil[3]{GSI Darmstadt, Germany}
+
+\maketitle
+
+The light vector mesons $\rho$, $\omega$ and $\phi$ are known to be excellent probes of the strongly interacting matter under extreme conditions. The leptonic decay channels of these mesons are of special interest as the leptons leave the hot and dense
+fireball without strong interaction and may reveal information on the characteristics of the matter created in the collisions. Single electron or positron tracks from incompletely detected $\gamma$-conversions and Dalitz decays of $\pi^{0}$-mesons are the most abundant source contributing to the significant combinatorial background.
+
+Emission from a thermal source was assumed to simulate electron pairs from meson decays for Au+Au reactions at SIS-100 and SIS-300 energies. The simulation parameters were chosen such that the meson spectra are consistent with $p_T$ and rapidity distributions measured by NA49~\cite{na49}. The pairs simulated with the Pluto\cite{pluto} event generator are embedded into hadronic final states calculated with UrQMD. $\delta$-electrons have been added equivalent to a 10 kHz interaction rate. These simulations are based on the July 2013 release of cbmroot.
+
+The strategy of background rejection comprises several steps. In order to identify leptons from photon conversions that were produced outside of the target region, each reconstructed track is extended to the primary decay vertex and removed from the analysis depending on extrapolation quality. An important characteristic for conversion pairs is their small opening angle. A wedge cut is applied taking into account the opening angle of an identified electron to its closest neighbour with particle identification and the momenta of the two tracks. As lepton tracks from background sources can predominantly be found at low transverse momenta such tracks are rejected~\cite{galatyuk09}.
+
+The Micro-Vertex Detector (MVD) of the Compressed Baryonic Matter (CBM) experiment can further contribute to reduce
+this background by including points from the MVD into the track reconstruction. An improved rejection of pairs originating from the target region could be observed. However, the MVD stations are also a source for $\gamma$ conversions which can not be effectively rejected by the vertex extrapolation cut. This resulted in an overall worse performance when including the MVD in the detector setup.
+
+To better identify off-vertex $\gamma$-conversions tracks are extrapolated to the first MVD station and required to be within its acceptance. This has resulted in an improved signal-to-background ratio for the low mass vector mesons $\rho$, $\omega$ and $\phi$ as can be see in table~\ref{tab:sb}. The invariant mass spectrum of the full cocktail can be seen in figure~\ref{fig:invmass}.
+
+\begin{center}
+\begin{table}
+\begin{tabular}{|l|p{2.5cm}|p{1.3cm}|p{1.7cm}|}
+\hline
+Particle & Number of MVD Stations & S/B & Significance \\ \hline
+$\rho^{0} \rightarrow$ & 0 & 0.033 & \\
+$e^{+}e^{-}$ & 4 & 0.072 & \\ \hline
+$\omega \rightarrow$ & 0 & 0.87 & \\
+$e^{+}e^{-}$ & 4 & 1.39 & \\ \hline
+$\phi \rightarrow$ & 0 & & \\
+$e^{+}e^{-}$ & 4 & & \\
+\hline
+\end{tabular}
+\caption{Signal-to-background ratios and significance for dilepton decays of various low mass vector mesons.}
+\label{tab:sb}
+\end{table}
+\end{center}
+
+\begin{figure}[h]
+\vspace{-0.5cm}
+\centering
+\includegraphics*[width=0.35\textwidth]{fh_ee_minv_cktA_8gev_1.0field_mvd4.eps}
+\caption{Invariant mass spectrum after all cuts are applied.}
+\label{fig:invmass}
+\end{figure}
+
+There have been major updates to the CBM software with more realistic digitization and geometries for the CBM detectors. The effects on the performance of the dielectron reconstruction need to be studied.
+
+%CBM has no detectors for electron identification in front of the magnetic field posing an additional challenge to dielectron analysis.
+
+
+\begin{thebibliography}{9} % Use for 1-9 references
+
+\bibitem{na49}
+C. Alt et al. (NA49 Collaboration), Phys. Rev. C 78, 044907 (2008)
+
+\bibitem{pluto} I. Froehlich et al., arXiv:0708.2382
+
+\bibitem{galatyuk09}
+T. Galatyuk, PhD Thesis, Goethe-Universit\"at, Frankfurt am Main, (2009)
+
+\end{thebibliography}
+
+\end{document}
+
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