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SUMMARY:Leading hadron PID effects in di-hadron angular correlations in ST
 AR
DTSTART;VALUE=DATE-TIME:20110527T140000Z
DTEND;VALUE=DATE-TIME:20110527T142000Z
DTSTAMP;VALUE=DATE-TIME:20130526T052622Z
UID:indico-contribution-256@cern.ch
DESCRIPTION:Speakers: KAUDER\, Kolja (University of Illinois at Chicago)\n
 Hard scatterings of partons provide a valuable colored probe of the\nstron
 gly-coupled medium created in ultra-relativistic heavy ion\ncollisions. Th
 ese hard scatterings can be studied  by means of angular\ncorrelations of 
 charged hadrons with  respect to a high transverse\nmomentum trigger parti
 cle.  Several recent two-particle correlation\nstudies indicate that A+A c
 ollision dynamics evolve significantly\nwith collision centrality. They sp
 ecifically reveal the presence of\nunexpected strong away-side deformation
  and the development of a\nlong-range "ridge" in  correlation  measured as
  a function of\n$\\Delta\\eta$ vs $\\Delta\\phi$. The detailed physics mec
 hanisms\nresponsible for these features however remain under active\ninves
 tigation.\n\nWe will present preliminary results of a new di-hadron correl
 ation\nanalysis\, measured as a function of $\\Delta \\phi$ vs $\\Delta \\
 eta$\,\nfor identified high-pT triggers from the high-statistics 200 GeV A
 u+Au\ndata sample collected by the STAR experiment at RHIC during Run-10.\
 nThe relativistic rise of the ionization energy loss dependence of\npartic
 les measured in the STAR TPC is used to obtain a statistical\nseparation  
 of charged pions\, kaons\, and protons. The $\\Delta \\phi$ vs\n$\\Delta \
 \eta$ correlations measured in this work extend earlier\nmeasurements of a
 zimuthal correlations (in $\\Delta \\phi$ only)  with\nidentified hadron t
 riggers\, which\, admittedly with  large\nuncertainties\, reported no sign
 ificant dependence on a leading hadron\nidentity. The added $\\Delta \\eta
 $ dimension and improved statistics\nreveal a rich set of new features: th
 e near-side ($ |\\Delta \\phi|\n\nhttp://indico.cern.ch/contributionDispla
 y.py?contribId=256&sessionId=66&confId=30248
LOCATION:Imperial Palace Salon Verdi AB
URL:http://indico.cern.ch/contributionDisplay.py?contribId=256&sessionId=6
 6&confId=30248
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