Excess production of low-mass lepton pairs in S+Au collisions at the CERN Super Proton Synchrotron and the quark-hadron phase transition

✍ Scribed by Dinesh Kumar Srivastava; Bikash Sinha; Charles Gale; Dipali Pal; Kevin Haglin

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 450 KB
• Volume: 610
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/s0375-9474(96)00369-7

✦ Synopsis

The mass distribution for excess dielectrons in S + Au collisions at 200 A GeV measured by the CERES collaboration at CERN Super Proton Synchrotron is analyzed. The data are seen to be in satisfactory agreement with a scenario where a thermalized quark-gtuon plasma is formed initially, which expands, cools, hadronizes, and undergoes a freeze out. The same treatment is also seen to provide a reasonable description for the excess dimuons measured by the HELIOS-3 experiment for S + W collisions. There is also a plausible evidence for a small contribution of bremsstrahlung production of low mass dielectrons in the CERES data.