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HK: Physik der Hadronen und Kerne

HK 39: Physik mit schweren Ionen

HK 39.3: Talk

Wednesday, March 22, 2006, 17:30–17:45, D

Dielectron production in Pb-Au collisions at 158 GeV per nucleon. — •Sergey Yurevich — Physics Institute, Heidelberg University, Philosophenweg 12, D-69120 Heidelberg

The main goal of the CERES/NA45 experiment at the CERN SPS is the measurement of low mass dielectrons. A significant enhancement of the lepton pairs over the hadron decays was observed in ion-induced collisions. To distinguish between different theoretical explanations of the enhancement the experiment was upgraded by the addition of a radial TPC to improve the mass resolution in the vector meson region. The final results on electron-pair production in 158 A GeV/c Pb-Au collisions taken in 2000 with the upgraded setup will be presented with a complete error analysis. The measurement of φ-meson in its e⁺e⁻ and K⁺K⁻ channels will be reported. All data are absolutely normalized.