Frankfurt 2014 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 64: Instrumentierung

HK 64.2: Vortrag

Freitag, 21. März 2014, 14:15–14:30, HZ 9

Employing the CBM Micro Vertex Detector for background rejection in dilepton analyses — •Erik Krebs for the CBM collaboration — Goethe-Universität Frankfurt

The light vector mesons ρ, ω and φ are known to be excellent probes of the processes taking place in violent heavy-ion collisions. The leptonic decay channels of these mesons are of special interest as the leptons leave the hot and dense fireball without further 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 dileptons.

The Micro-Vertex Detector (MVD) of the Compressed Baryonic Matter (CBM) experiment may contribute to reduce this background by employing two methods. The excellent position resolution of the MVD and its proximity to the target gives a chance to reject close pairs by measuring the distance between nearest hits. A specific field configuration will be required for this approach. A second approach is to reconstruct the low momentum partner of a conversion electron in the MVD.

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