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SUMMARY:Energy dependence of energy loss in Au+Au collisions at PHENIX
DTSTART;VALUE=DATE-TIME:20110527T165000Z
DTEND;VALUE=DATE-TIME:20110527T171000Z
DTSTAMP;VALUE=DATE-TIME:20130522T214658Z
UID:indico-contribution-512@cern.ch
DESCRIPTION:Speakers: NOVITZKY\, Norbert (Department of Physics-University
  of Jyvaskyla)\nThe suppression of inclusive pion production by up to a fa
 ctor of 5\, which was first observed in Au + Au at √sNN= 130 GeV/c (e.g.
  [1]) and later in Au + Au at √sNN= 200 GeV/c [2\, 3]\, is one of the mo
 st significant manifestations of the opaque QGP produced in heavy ion coll
 isions. The absence of this suppression in d + Au collisions at the same e
 nergy indicates the final state nature of the suppression. It is natural t
 o ask where the onset of such massive suppression is in terms of the energ
 y density of the medium which is dictated by the collision energy\, centra
 lity and the mass of colliding nuclei. The PHENIX collaboration has studie
 d collisions of lighter nuclei (Cu + Cu) at different beam energies in 200
 5 [4]. While a significant suppression is observed both at √sNN = 200 an
 d 62.4 GeV\, at √sNN = 22.4 GeV a moderate enhancement is found. In 2010
  RHIC scanned lower energies\, and PHENIX collected substantial data sets 
 in Au + Au collisions at √sNN = 39 and 62 GeV. The goal was to identify 
 better the conditions for the onset of the π0 suppression. This talk pres
 ents results from the systematic study of c.m. energy and the system size 
 dependencies of π0 yield and the nuclear modification factor.\nReferences
 \n[1] K. Adcox et al.\, Phys.Rev.Lett. 88\, 022301 (2002). \n[2] S. S. Adl
 er et al.\, Phys.Rev.Lett. 96\, 202301 (2006). \n[3] A. Adare et al.\, Phy
 s.Rev.Lett. 101\, 232301 (2008). \n[4] A. Adare et al.\, Phys.Rev.Lett. 10
 1\, 162301 (2008).\n\nhttp://indico.cern.ch/contributionDisplay.py?contrib
 Id=512&sessionId=72&confId=30248
LOCATION:Imperial Palace Salon Berlioz AB
URL:http://indico.cern.ch/contributionDisplay.py?contribId=512&sessionId=7
 2&confId=30248
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