Measurement of Direct Photons in Au plus Au Collisions at √sNN=200 GeV

被引：79

作者：

Afanasiev, S. ^{[1
]}

Aidala, C. ^{[8
,9
]}

Ajitanand, N. N. ^{[44
]}

Akiba, Y. ^{[38
,39
]}

Al-Jamel, A. ^{[34
]}

Alexander, J. ^{[44
]}

Aoki, K. ^{[24
,38
]}

Aphecetche, L. ^{[46
]}

Armendariz, R. ^{[34
]}

Aronson, S. H. ^{[4
]}

Averbeck, R. ^{[45
]}

Awes, T. C. ^{[35
]}

Azmoun, B. ^{[4
]}

Babintsev, V. ^{[16
]}

Baldisseri, A. ^{[10
]}

Barish, K. N. ^{[5
]}

Barnes, P. D. ^{[27
]}

Bassalleck, B. ^{[33
]}

Bathe, S. ^{[5
]}

Batsouli, S. ^{[8
,9
]}

Baublis, V. ^{[37
]}

Bauer, F. ^{[5
]}

Bazilevsky, A. ^{[4
]}

Belikov, S. ^{[4
,19
]}

Bennett, R. ^{[45
]}

Berdnikov, Y. ^{[41
]}

Bjorndal, M. T. ^{[8
,9
]}

Boissevain, J. G. ^{[27
]}

Borel, H. ^{[10
]}

Boyle, K. ^{[45
]}

Brooks, M. L. ^{[27
]}

Brown, D. S. ^{[34
]}

Bucher, D. ^{[30
]}

Buesching, H. ^{[4
]}

Bumazhnov, V. ^{[16
]}

Bunce, G. ^{[4
,39
]}

Burward-Hoy, J. M. ^{[27
]}

Butsyk, S. ^{[45
]}

Campbell, S. ^{[45
]}

Chai, J. -S. ^{[20
]}

Chernichenko, S. ^{[16
]}

Chi, C. Y. ^{[8
,9
]}

Chiba, J. ^{[21
]}

Chiu, M. ^{[8
,9
]}

Choi, I. J. ^{[54
]}

Chujo, T. ^{[50
]}

Cianciolo, V. ^{[35
]}

Cleven, C. R. ^{[14
]}

Cobigo, Y. ^{[10
]}

Cole, B. A. ^{[8
,9
]}

机构：

[1] Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia

[2] Abilene Christian Univ, Abilene, TX 79699 USA

[3] Banaras Hindu Univ, Dept Phys, Varanasi 221005, Uttar Pradesh, India

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

[5] Univ Calif Riverside, Riverside, CA 92521 USA

[6] Univ Tokyo, Grad Sch Sci, Ctr Nucl Study, Bunkyo Ku, Tokyo 1130033, Japan

[7] Univ Colorado, Boulder, CO 80309 USA

[8] Columbia Univ, New York, NY 10027 USA

[9] Nevis Labs, Irvington, NY 10533 USA

[10] CEA Saclay, F-91191 Gif Sur Yvette, France

[11] Debrecen Univ, H-4010 Debrecen, Hungary

[12] Eotvos Lorand Univ, ELTE, H-1117 Budapest, Hungary

[13] Florida State Univ, Tallahassee, FL 32306 USA

[14] Georgia State Univ, Atlanta, GA 30303 USA

[15] Hiroshima Univ, Higashihiroshima 7398526, Japan

[16] Inst High Energy Phys, State Res Ctr Russian Federat, IHEP Protvino, Protvino 142281, Russia

[17] Univ Illinois, Urbana, IL 61801 USA

[18] Russian Acad Sci, Inst Nucl Res, Moscow 117312, Russia

[19] Iowa State Univ, Ames, IA 50011 USA

[20] Cyclotron Applicat Lab, KAERI, Seoul, South Korea

[21] High Energy Accelerator Res Org, KEK, Tsukuba, Ibaraki 3050801, Japan

[22] Korea Univ, Seoul 136701, South Korea

[23] Russian Res Ctr, Kurchatov Inst, Moscow 123098, Russia

[24] Kyoto Univ, Kyoto 6068502, Japan

[25] Ecole Polytech, CNRS IN2P3, Lab Leprince Ringuet, F-91128 Palaiseau, France

[26] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

[27] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[28] Univ Blaise Pascal, CNRS IN2P3, LPC, F-63177 Aubiere, France

[29] Lund Univ, Dept Phys, SE-22100 Lund, Sweden

[30] Univ Munster, Inst Kernphys, D-48149 Munster, Germany

[31] Myongji Univ, Yongin 449728, Kyonggido, South Korea

[32] Nagasaki Inst Appl Sci, Nagasaki 8510193, Japan

[33] Univ New Mexico, Albuquerque, NM 87131 USA

[34] New Mexico State Univ, Las Cruces, NM 88003 USA

[35] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

[36] Univ Paris 11, CNRS IN2P3, IPN Orsay, F-91406 Orsay, France

[37] Petersburg Nucl Phys Inst, PNPI, Gatchina 188300, Leningrad Regio, Russia

[38] RIKEN Nishina Ctr Accelerator Based Sci, Wako, Saitama 3510198, Japan

[39] Brookhaven Natl Lab, RIKEN BNL Res Ctr, Upton, NY 11973 USA

[40] Rikkyo Univ, Dept Phys, Toshima Ku, Tokyo 1718501, Japan

[41] St Petersburg State Polytech Univ, St Petersburg 195251, Russia

[42] Univ Sao Paulo, Inst Fis, BR-05315970 Sao Paulo, Brazil

[43] Seoul Natl Univ, Seoul, South Korea

[44] SUNY Stony Brook, Dept Chem, Stony Brook, NY 11794 USA

[45] SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA

[46] Univ Nantes, CNRS IN2P3, Ecole Mines Nantes, SUBATECH, Nantes, France

[47] Univ Tennessee, Knoxville, TN 37996 USA

[48] Tokyo Inst Technol, Dept Phys, Meguro Ku, Tokyo 1528551, Japan

[49] Univ Tsukuba, Inst Phys, Tsukuba, Ibaraki 305, Japan

[50] Vanderbilt Univ, Nashville, TN 37235 USA

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 109卷 / 15期

基金：

以色列科学基金会; 新加坡国家研究基金会; 美国国家科学基金会; 日本学术振兴会;

关键词：

Collisional plasmas - Distribution functions;

D O I：

10.1103/PhysRevLett.109.152302

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report the measurement of direct photons at midrapidity in Au + Au collisions at root s(NN) = 200 GeV. The direct photon signal was extracted for the transverse momentum range of 4 GeV/c < pT < 22 GeV/c, using a statistical method to subtract decay photons from the inclusive photon sample. The direct photon nuclear modification factor R-AA was calculated as a function of p(T) for different Au + Au collision centralities using the measured p + p direct photon spectrum and compared to theoretical predictions. R-AA was found to be consistent with unity for all centralities over the entire measured pT range. Theoretical models that account for modifications of initial direct photon production due to modified parton distribution functions in Au and the different isospin composition of the nuclei predict a modest change of R-AA from unity. They are consistent with the data. Models with compensating effects of the quark-gluon plasma on high-energy photons, such as suppression of jet-fragmentation photons and induced-photon bremsstrahlung from partons traversing the medium, are also consistent with this measurement.

引用

页数：7

共 50 条

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