The CERES/NA45 collaboration measured, at the CERN SPS, low-mass electron pair production in Pb-Au collisions at 158AGeV/c incident momentum. In this paper we present an analysis of the data taken during the SPS Pb-beam period in the fall of 1995. The results confirm previous findings of CERES showing that the pair production in the mass range 0.2<mee<1.5GeV/c2, when scaled to the ion case with the event multiplicity, is enhanced over the expected yield from the known hadronic sources in pp collisions. A comparison of the results for different multiplicity bins indicates that the excess increases faster than linearly with charged-particle multiplicity. We also present the transverse-momentum distributions of the observed pairs
CERES results on low-mass electron pair production in Pb-Au collisions
GATTI, EMILIO;SAMPIETRO, MARCO;
1998-01-01
Abstract
The CERES/NA45 collaboration measured, at the CERN SPS, low-mass electron pair production in Pb-Au collisions at 158AGeV/c incident momentum. In this paper we present an analysis of the data taken during the SPS Pb-beam period in the fall of 1995. The results confirm previous findings of CERES showing that the pair production in the mass range 0.2I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.