Darmstadt 2016 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 10: Heavy Ion Collision and QCD Phases III

HK 10.5: Talk

Monday, March 14, 2016, 17:45–18:00, S1/01 A01

Background rejection in dilepton analysis with the CBM-MVD — •Erik Krebs for the CBM-MVD collaboration — Goethe-Universität Frankfurt

The structure of the QCD phase diagram for moderate temperatures and high baryon chemical potentials is still practically unexplored. Dilepton measurements could provide information on the onset of deconfinement and on the subject of chiral symmetry restoration. The light vector mesons ρ, ω and φ 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. However, electrons from photon-conversions and Dalitz decays of pions are the main contributors to a large combinatorial background obscuring the information carried by the rare dileptons.

Studies have been made about whether the Micro-Vertex Detector (MVD) of the Compressed Baryonic Matter (CBM) experiment can contribute to reduce this background by reconstructing the low momentum partner of background pair in the MVD. CBM has no detectors for electron identification in front of the magnetic field posing an additional challenge to dielectron analysis. Methods for background rejection will be presented in this contribution. The capabilities of CBM detector to reconstruct a thermal radiation will be addressed.

*This work has been supported by BMBF (05P12RFFC7), GSI and HIC for FAIR.