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CERES results on low-mass electron pair production in PbAu collisions

✍ Scribed by G. Agakichiev; R. Baur; P. Braun-Munzinger; F. Ceretto; A. Drees; S. Esumi; U. Faschingbauer; Z. Fraenkel; Ch. Fuchs; E. Gatti; P. Glässel; C.P. de los Heros; P. Holl; Ch. Jung; B. Lenkeit; M. Messer; Y. Panebrattsev; A. Pfeiffer; J. Rak; I. Ravinovich; S. Razin; P. Rehak; M. Richter; M. Sampietro; N. Saveljic; J. Schukraft; S. Shimanskiy; W. Seipp; E. Socol; H.J. Specht; J. Stachel; G. Tel-Zur; I. Tserruya; T. Ullrich; C. Voigt; C. Weber; J.P. Wessels; T. Wienold; J.P. Wurm; V. Yurevich

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
791 KB
Volume
638
Category
Article
ISSN
0375-9474

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✦ Synopsis

The CERES/NA45 collaboration measured, at the CERN SPS, low-mass electron pair production in Pb-Au collisions at 158 A GeV/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 < m~ < 1.5 GeV/c 2, 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 transw~rse-momentum distributions of the observed pairs.

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