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HK: Physik der Hadronen und Kerne

HK 47: Heavy Ions VI

HK 47.3: Vortrag

Donnerstag, 14. März 2002, 17:00–17:15, E

Low-Mass Lepton Pair Production in Pb-Au Collisions at 40 AGeV — •Sanja Damjanovic — University Heidelberg, Germany, Philosophenweg 12, 69120

Low-Mass Lepton Pair Production in Pb-Au Collisions at 40 AGeV

Sanja Damjanovic for the CERES/NA45 Collaboration

The CERES/NA45 experiment at the CERN SPS has previously measured e⁺e⁻ pair production in 160 AGeV Pb-Au collisions. In the mass region m>0.2 GeV/c², an enhancement of 2.7±0.4(statist.)±0.5(syst.) compared to the expectation from known hadronic decay sources was observed. In the 40 AGeV data taken in 1999, an enhancement is again found; a preliminary analysis gives the even larger value of 4.5±1.2(statist. ).The results are compared to theoretical model calculations based on π⁺π⁻ annihilation with a modified ρ-propagator.