engleski

Measurement of low mass dielectrons with the HBD upgrade of PHENIX

The PHENIX experiment was upgraded with the Hadron Blind Detector (HBD) for the measurement of low- mass electron pairs. The HBD reduces the combinatorial background by providing additional electron identification in a field-free region close to the vertex and by exploiting the small opening angle of the pi0 Dalitz and conversion pairs. The HBD was successfully operated during Run 9 and Run 10 at the RHIC in the measurements of e^+e^- pairs in p+p and Au+Au collisions, respectively. This paper reports on the present status of the dielectron analysis in Au+Au collisions at \sqrt{; ; s_{; ; NN}; ; }; ; = 200 GeV.

Hot and Dense Nuclear Matter; Low Mass Dileptons; Hadron Blind Detector

Rad je prezentiran na skupu The 22nd International conference on ultra relativistic nucleus-nucleus collisions, održanom u svibnju 2011.g., Annecy, Francuska ; Y. Schutz, U. Wiedemann (ur.).