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Energy dependence of pi(+/-), p and (p)over-bar transverse momentum spectra for Au+Au collisions at root SNN=62.4 and 200 GeV
Abelev, B. I.; Aggarwal, M. M.; Ahammed, Z.; Anderson, B. D.; Arkhipkin, D.; Averichev, G. S.; Bai, Y.; Balewski, J.; Barannikova, O.; Barnby, L. S.
刊名PHYSICS LETTERS B
2007-11-01
卷号655页码:104-113
关键词particle production recombination fragmentation jet quenching nuclear modification factor particle ratios
ISSN号0370-2693
DOI10.1016/j.physletb.2007.06.035
英文摘要We study the energy dependense of the transverse momentum (PT) spectra for charged pions, protons and anti-protons for An + An collisions at root(NN)-N-s = 62.4 and 200 GeV. Data are presented at mid-rapidity (broken vertical bar y broken vertical bar < 0.5) for 0.2 < PT < 12 GeV/c. In the intermediate PT region (2 < PT < 6 GeV/c), the nuclear modification factor is higher at 62.4 GeV than at 200 GeV, while at higher PT (PT > 7 GeV/c) the modification is similar for both energies. The p/pi(+) and (p) over bar/pi(-) ratios for central collisions at root(NN)-N-s = 62.4 GeV peak at PT similar or equal to 2 GeV/c. In the PT range where recombination is expected to dominate, the p/pi(+) ratios at 62.4 GeV are larger than at 200 GeV, while the (p) over bar/pi(-) ratios are smaller. For PT > 2 GeV/c, the (p) over bar/pi(-) ratios at the two beam energies are independent of P-T and centrality indicating that the dependence of the (p) over bar/pi(-) ratio on P-T does not change between 62.4 and 200 GeV. These findings challenge various models incorporating jet quenching and/or constituent quark coalescence. (C) 2007 Elsevier B.V. All rights reserved.
WOS关键词NUCLEUS-NUCLEUS COLLISIONS ; RESISTIVE PLATE CHAMBERS ; QUARK-GLUON PLASMA ; PARTICLE IDENTIFICATION ; HADRON-PRODUCTION ; D+AU COLLISIONS ; STAR EXPERIMENT ; JET ; COLLABORATION ; PROTON
WOS研究方向Physics
语种英语
出版者ELSEVIER SCIENCE BV
WOS记录号WOS:000251016300003
内容类型期刊论文
源URL[http://119.78.100.186/handle/113462/27696]  
专题中国科学院近代物理研究所
通讯作者Mohanty, B.
作者单位1.Argonne Natl Lab, Argonne, IL 60439 USA
2.Univ Birmingham, Birmingham, W Midlands, England
3.Brookhaven Natl Lab, Upton, NY 11973 USA
4.CALTECH, Pasadena, CA 91125 USA
5.Univ Calif Berkeley, Berkeley, CA 94720 USA
6.Univ Calif Davis, Davis, CA 95616 USA
7.Univ Calif Los Angeles, Los Angeles, CA 90095 USA
8.Carnegie Mellon Univ, Pittsburgh, PA 15213 USA
9.Univ Illinois, Chicago, IL USA
10.Creighton Univ, Omaha, NE 68178 USA
推荐引用方式
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Abelev, B. I.,Aggarwal, M. M.,Ahammed, Z.,et al. Energy dependence of pi(+/-), p and (p)over-bar transverse momentum spectra for Au+Au collisions at root SNN=62.4 and 200 GeV[J]. PHYSICS LETTERS B,2007,655:104-113.
APA Abelev, B. I..,Aggarwal, M. M..,Ahammed, Z..,Anderson, B. D..,Arkhipkin, D..,...&Zuo, J. X..(2007).Energy dependence of pi(+/-), p and (p)over-bar transverse momentum spectra for Au+Au collisions at root SNN=62.4 and 200 GeV.PHYSICS LETTERS B,655,104-113.
MLA Abelev, B. I.,et al."Energy dependence of pi(+/-), p and (p)over-bar transverse momentum spectra for Au+Au collisions at root SNN=62.4 and 200 GeV".PHYSICS LETTERS B 655(2007):104-113.
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