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Title: Energy Loss and Flow of Heavy Quarks in Au+Au Collisions at {radical}(s{sub NN})=200 GeV

Abstract

The PHENIX experiment at the BNL Relativistic Heavy Ion Collider (RHIC) has measured electrons with 0.3<p{sub T}<9 GeV/c at midrapidity (vertical bar y vertical bar <0.35) from heavy-flavor (charm and bottom) decays in Au+Au collisions at {radical}(s{sub NN})=200 GeV. The nuclear modification factor R{sub AA} 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 v{sub 2} with respect to the reaction plane is observed for 0.5<p{sub T}<5 GeV/c indicating substantial heavy-flavor elliptic flow. Both R{sub AA} and v{sub 2} show a p{sub T} dependence different from those of neutral pions. A comparison to transport models which simultaneously describe R{sub AA}(p{sub T}) and v{sub 2}(p{sub T}) suggests that the viscosity to entropy density ratio is close to the conjectured quantum lower bound, i.e., near a perfect fluid.

Authors:
; ; ; ; ; ; ;  [1]; ; ; ; ; ; ;  [2]; ; ; ; ;  [3]
  1. University of Colorado, Boulder, Colorado 80309 (United States)
  2. Joint Institute for Nuclear Research, 141980 Dubna (Russian Federation)
  3. Columbia University, New York, New York 10027 (United States) and Nevis Laboratories, Irvington, New York 10533 (United States) (and others)
Publication Date:
OSTI Identifier:
20951270
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 98; Journal Issue: 17; Other Information: DOI: 10.1103/PhysRevLett.98.172301; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ANISOTROPY; B QUARKS; BNL; BROOKHAVEN RHIC; C QUARKS; COLLIDING BEAMS; COMPARATIVE EVALUATIONS; ELECTRONS; ENERGY LOSSES; ENTROPY; FLAVOR MODEL; GEV RANGE 100-1000; GOLD 197 BEAMS; GOLD 197 REACTIONS; GOLD 197 TARGET; IDEAL FLOW; PARTICLE DECAY; PIONS NEUTRAL; T QUARKS; TRANSPORT THEORY

Citation Formats

Adare, A., Bickley, A. A., Ellinghaus, F., Kelly, S., Kinney, E., Nagle, J. L., Seele, J., Wysocki, M., Afanasiev, S., Isupov, A., Litvinenko, A., Malakhov, A., Peresedov, V., Rukoyatkin, P., Zolin, L., Aidala, C., Bjorndal, M. T., Chi, C. Y., Cole, B. A., and D'Enterria, D.. Energy Loss and Flow of Heavy Quarks in Au+Au Collisions at {radical}(s{sub NN})=200 GeV. United States: N. p., 2007. Web. doi:10.1103/PHYSREVLETT.98.172301.
Adare, A., Bickley, A. A., Ellinghaus, F., Kelly, S., Kinney, E., Nagle, J. L., Seele, J., Wysocki, M., Afanasiev, S., Isupov, A., Litvinenko, A., Malakhov, A., Peresedov, V., Rukoyatkin, P., Zolin, L., Aidala, C., Bjorndal, M. T., Chi, C. Y., Cole, B. A., & D'Enterria, D.. Energy Loss and Flow of Heavy Quarks in Au+Au Collisions at {radical}(s{sub NN})=200 GeV. United States. doi:10.1103/PHYSREVLETT.98.172301.
Adare, A., Bickley, A. A., Ellinghaus, F., Kelly, S., Kinney, E., Nagle, J. L., Seele, J., Wysocki, M., Afanasiev, S., Isupov, A., Litvinenko, A., Malakhov, A., Peresedov, V., Rukoyatkin, P., Zolin, L., Aidala, C., Bjorndal, M. T., Chi, C. Y., Cole, B. A., and D'Enterria, D.. Fri . "Energy Loss and Flow of Heavy Quarks in Au+Au Collisions at {radical}(s{sub NN})=200 GeV". United States. doi:10.1103/PHYSREVLETT.98.172301.
@article{osti_20951270,
title = {Energy Loss and Flow of Heavy Quarks in Au+Au Collisions at {radical}(s{sub NN})=200 GeV},
author = {Adare, A. and Bickley, A. A. and Ellinghaus, F. and Kelly, S. and Kinney, E. and Nagle, J. L. and Seele, J. and Wysocki, M. and Afanasiev, S. and Isupov, A. and Litvinenko, A. and Malakhov, A. and Peresedov, V. and Rukoyatkin, P. and Zolin, L. and Aidala, C. and Bjorndal, M. T. and Chi, C. Y. and Cole, B. A. and D'Enterria, D.},
abstractNote = {The PHENIX experiment at the BNL Relativistic Heavy Ion Collider (RHIC) has measured electrons with 0.3<p{sub T}<9 GeV/c at midrapidity (vertical bar y vertical bar <0.35) from heavy-flavor (charm and bottom) decays in Au+Au collisions at {radical}(s{sub NN})=200 GeV. The nuclear modification factor R{sub AA} 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 v{sub 2} with respect to the reaction plane is observed for 0.5<p{sub T}<5 GeV/c indicating substantial heavy-flavor elliptic flow. Both R{sub AA} and v{sub 2} show a p{sub T} dependence different from those of neutral pions. A comparison to transport models which simultaneously describe R{sub AA}(p{sub T}) and v{sub 2}(p{sub T}) suggests that the viscosity to entropy density ratio is close to the conjectured quantum lower bound, i.e., near a perfect fluid.},
doi = {10.1103/PHYSREVLETT.98.172301},
journal = {Physical Review Letters},
number = 17,
volume = 98,
place = {United States},
year = {Fri Apr 27 00:00:00 EDT 2007},
month = {Fri Apr 27 00:00:00 EDT 2007}
}