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HK: Fachverband Physik der Hadronen und Kerne

HK 5: Physik mit schweren Ionen

HK 5.1: Vortrag

Montag, 12. März 2007, 18:00–18:15, F

Reconstruction of π⁰ with CERES — •Rachik Soualah for the CERES Collaboration — Physikalisches Institut, Universität Heidelberg, Germany

Direct photons are a suitable probe to search for evidence of quark-gluon plasma formation in ultrarelativistic heavy-ion collisions. Direct photons are very difficult to measure experimentally due to the large background from π⁰ and η meson decays. The WA98 experiment at SPS has reported a significant yield of direct photons. The main systematic error comes from the yield of η mesons, measured only poorly at SPS energies. In addition, the main source of systematic errors in the measurement of the dilepton pairs in the low mass range, main physics topic of the CERES experiment comes from the η/π⁰ ratio.
CERES can measure the photons that convert shortly before the TPC by measuring the e⁺e⁻ pairs in the TPC. In this contribution, the method to measure photons will be explained. The status of the π⁰ analysis and the feasibility studies of η meson reconstruction will be presented.