Transverse-momentum spectra in Au plus Au and d plus Au collisions at √sNN=200 GeV and the pseudorapidity dependence of high-pT suppression

被引：341

作者：

Arsene, I

Bearden, IG

Beavis, D

Besliu, C

Budick, B

Boggild, H

Chasman, C

Christensen, CH

Christiansen, P

Cibor, J

Debbe, R

Enger, E

Gaardhoje, JJ

Germinario, M

Hagel, K

Hansen, O

Holm, A

Ito, H

Jipa, A

Jundt, F

Jordre, JI

Jorgensen, CE

Karabowicz, R

Kim, EJ

Kozik, T

Larsen, TM

Lee, JH

Lee, YK

Lindal, S

Lystad, G

Lovhoiden, G

Majka, Z

Makeev, A

McBreen, B

Mikelsen, M

Murray, M

Natowitz, J

Neumann, B

Nielsen, BS

Norris, J

Ouerdane, D

Planeta, R

Rami, F

Ristea, C

Ristea, O

Röhrich, D

Samset, BH

Sandberg, D

Sanders, SJ

Scheetz, RA

机构：

[1] Brookhaven Natl Lab, Upton, NY 11973 USA

[2] Inst Rech Subatom, Strasbourg, France

[3] Univ Strasbourg, Strasbourg, France

[4] Inst Nucl Phys, Krakow, Poland

[5] Jagiellonian Univ, M Smoluchkowski Inst Phys, Krakow, Poland

[6] Johns Hopkins Univ, Baltimore, MD 21218 USA

[7] NYU, New York, NY 10003 USA

[8] Univ Copenhagen, Niels Bohr Inst, DK-2100 Copenhagen, Denmark

[9] Texas A&M Univ, College Stn, TX USA

[10] Univ Bergen, Dept Phys, Bergen, Norway

[11] Univ Bucharest, Bucharest, Romania

[12] Univ Kansas, Lawrence, KS 66045 USA

[13] Univ Oslo, Dept Phys, Oslo, Norway

来源：

PHYSICAL REVIEW LETTERS | 2003年 / 91卷 / 07期

关键词：

D O I：

10.1103/PhysRevLett.91.072305

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present spectra of charged hadrons from Au+Au and d+Au collisions at roots(NN)=200 GeV measured with the BRAHMS experiment at RHIC. The spectra for different collision centralities are compared to spectra from p+(p) over bar collisions at the same energy scaled by the number of binary collisions. The resulting ratios (nuclear modification factors) for central Au+Au collisions at eta=0 and eta=2.2 evidence a strong suppression in the high p(T) region (>2 GeV/c). In contrast, the d+Au nuclear modification factor (at eta=0) exhibits an enhancement of the high p(T) yields. These measurements indicate a high energy loss of the high p(T) particles in the medium created in the central Au+Au collisions. The lack of suppression in d+Au collisions makes it unlikely that initial state effects can explain the suppression in the central Au+Au collisions.

引用

页数：4

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