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Ullrich, Th; Agakichiev, G.; Baur, R.; Braun-Munzinger, P.; Ceretto, F.; Drees, A.; Esumi, S.; Faschingbauer, U.; Fuchs, Ch; Gatti, E.; Glässel, P.; de los Heros, C.P.; Holl, P.; Jung, Ch; Kraner, H.; Lenkeit, B.; Messer, M.; Minaev, Y.; Panebrattsev, Y.; Pfeiffer, A.; Rak, J.; Ravinovich, I.; Razin, S.; Rehak, P.; Sampietro, M.; Schukraft, J.; Shimanskiy, S.; Socol, E.; Specht, H.J.; Stachel, J.; Tel-Zur, G.; Tserruya, I.; Ullrich, Th; Voigt, C.; Weber, C.; Wessels, J.P.; Wurm, J.P.; Yurevich, V.
Nuclear physics. A, 12/1996, Letnik: 610Journal Article
We report preliminary results of the first measurement of low-mass electron pairs in 160 GeV/nucleon PbAu collisions at central rapidities in a wide multiplicity range. This work is the continuation of our systematic studies on pair production in p-Be, p-Au and SAu interactions. The motivation for this effort derives from a new source of lowmass dileptons recently observed in SAu and S-W collisions by CERES and HELIOS/3, respectively. The results obtained in the analysis of the PbAu data confirm our previous finding that pair production in the mass range 0.2 < m ee < 1.5 GeV/ c 2 is enhanced over the contributions from hadron decays while no significant excess could be observed for m ee ≲ 2m π . A comparison of the results for different multiplicity bins favours a non-linear dependence of the e +e −-yield on the accompanying charged particle densities.
