Energy Loss and Flow of Heavy Quarks in Au + Au Collisions at √sNN = 200 GeV

Physical Review Letters Volume 98 Issue 17 Page 172301-1-172301-6 published_at 2007-04-24
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Title ( eng )
Energy Loss and Flow of Heavy Quarks in Au + Au Collisions at √sNN = 200 GeV
PHENIX Collaboration
Enokizono Akitomo
Hachiya Takashi
Harada Hiroyuki
Haruna Kohta
Nakamiya Yoshihide
Nakamura Tomoaki
Ouchida Misaki
Sakata Hirokazu
Tsuchimoto Yuji
Source Title
Physical Review Letters
Volume 98
Issue 17
Start Page 172301-1
End Page 172301-6
The PHENIX experiment at the BNL Relativistic Heavy Ion Collider (RHIC) has measured electrons with 0.3 < pT < 9 GeV/c at midrapidity (|y|<0.35) from heavy-flavor (charm and bottom) decays in Au + Au collisions at √sNN = 200 GeV. The nuclear modification factor RAA relative to p + p collisions shows a strong suppression in central Au + Au collisions, indicating substantial energy loss of heavy quarks in the medium produced at RHIC energies. A large azimuthal anisotropy v2 with respect to the reaction plane is observed for 0.5 < pT < 5 GeV/c indicating substantial heavy-flavor elliptic flow. Both RAA and v2 show a pT dependence different from those of neutral pions. A comparison to transport models which simultaneously describe RAA(pT) and v2(pT) suggests that the viscosity to entropy density ratio is close to the conjectured quantum lower bound, i.e., near a perfect fluid.
Resource Type journal article
American Physical Society
Date of Issued 2007-04-24
Copyright (c) 2007 The American Physical Society.
Publish Type Version of Record
Access Rights open access
Source Identifier
[ISSN] 0031-9007
[DOI] 10.1103/PhysRevLett.98.172301
[NCID] AA00773679