Heidelberg 2015 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 73: Heavy Ion Collisions and QCD Phases 10

HK 73.6: Vortrag

Freitag, 27. März 2015, 16:15–16:30, T/HS2

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

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 and positrons from γ-conversions and Dalitz decays of π⁰ are the main contributors to a large combinatorial background obscuring the information carried by the rare dileptons.

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.

*This work has been supported by BMBF (05P12RFFC7), HIC for FAIR, HGS-HIRe, H-QM, and GSI.