Event-by-event fluctuations of the mean transverse momentum in 40, 80, and 158 A GeV/c PbAu collisions

✍ Scribed by D. Adamová; G. Agakichiev; H. Appelshäuser; V. Belaga; P. Braun-Munzinger; R. Campagnolo; A. Castillo; A. Cherlin; S. Damjanović; T. Dietel; L. Dietrich; A. Drees; S. Esumi; K. Filimonov; K. Fomenko; Z. Fraenkel; C. Garabatos; P. Glässel; G. Hering; J. Holeczek; V. Kushpil; B. Lenkeit; W. Ludolphs; A. Maas; A. Marı́n; J. Milošević; A. Milov; D. Miśkowiec; L. Musa; Yu. Panebrattsev; O. Petchenova; V. Petráček; A. Pfeiffer; J. Rak; I. Ravinovich; P. Rehak; M. Richter; H. Sako; W. Schmitz; J. Schukraft; S. Sedykh; W. Seipp; A. Sharma; S. Shimansky; J. Slı́vová; H.J. Specht; J. Stachel; M. Šumbera; H. Tilsner; I. Tserruya; J.P. Wessels; T. Wienold; B. Windelband; J.P. Wurm; W. Xie; S. Yurevich; V. Yurevich

• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 377 KB
• Volume: 727
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/j.nuclphysa.2003.07.018

✦ Synopsis

Measurements of event-by-event fluctuations of the mean transverse momentum in Pb-Au collisions at 40, 80, and 158 A GeV/c are presented. A significant excess of mean p T fluctuations at mid-rapidity is observed over the expectation from statistically independent particle emission. The results are somewhat smaller than recent measurements at RHIC. A possible non-monotonic behavior of the mean p T fluctuations as function of collision energy, which may have indicated that the system has passed the critical point of the QCD phase diagram in the range of µ B under investigation, has not been observed. The centrality dependence of mean p T fluctuations in Pb-Au is consistent with an extrapolation from pp collisions assuming that the non-statistical fluctuations scale with multiplicity. The results are compared to calculations by the RQMD and URQMD event generators.