Enhanced Production of Direct Photons in Au plus Au Collisions at √sNN=200 GeV and Implications for the Initial Temperature

被引：315

作者：

Adare, A. ^{[1
]}

Afanasiev, S. ^{[23
]}

Aidala, C. ^{[9
,10
]}

Ajitanand, N. N. ^{[50
]}

Akiba, Y. ^{[44
,45
]}

Al-Bataineh, H. ^{[39
]}

Alexander, J. ^{[50
]}

Al-Jamel, A. ^{[39
]}

Aoki, K. ^{[29
,44
]}

Aphecetche, L. ^{[52
]}

Armendariz, R. ^{[39
]}

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

Asai, J. ^{[45
]}

Atomssa, E. T. ^{[30
]}

Averbeck, R. ^{[51
]}

Awes, T. C. ^{[40
]}

Azmoun, B. ^{[4
]}

Babintsev, V. ^{[19
]}

Baksay, G. ^{[15
]}

Baksay, L. ^{[15
]}

Baldisseri, A. ^{[12
]}

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

Barnes, P. D. ^{[32
]}

Bassalleck, B. ^{[38
]}

Bathe, S. ^{[5
]}

Batsouli, S. ^{[9
,10
,40
]}

Baublis, V. ^{[43
]}

Bauer, F. ^{[5
]}

Bazilevsky, A. ^{[4
]}

Belikov, S. ^{[4
,22
]}

Bennett, R. ^{[51
]}

Berdnikov, Y. ^{[47
]}

Bickley, A. A. ^{[1
]}

Bjorndal, M. T. ^{[9
,10
]}

Boissevain, J. G. ^{[32
]}

Borel, H. ^{[12
]}

Boyle, K. ^{[51
]}

Brooks, M. L. ^{[32
]}

Brown, D. S. ^{[39
]}

Bucher, D. ^{[35
]}

Buesching, H. ^{[4
]}

Bumazhnov, V. ^{[19
]}

Bunce, G. ^{[4
,45
]}

Burward-Hoy, J. M. ^{[32
]}

Butsyk, S. ^{[32
,51
]}

Campbell, S. ^{[51
]}

Chai, J. -S. ^{[24
]}

Chang, B. S. ^{[59
]}

Charvet, J. -L. ^{[12
]}

Chernichenko, S. ^{[19
]}

机构：

[1] Univ Colorado, Boulder, CO 80309 USA

[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] Charles Univ Prague, CR-11636 Prague 1, Czech Republic

[7] CIAE, Beijing, Peoples R China

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

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

[10] Nevis Labs, Irvington, NY 10533 USA

[11] Czech Tech Univ, Prague 16636 6, Czech Republic

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

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

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

[15] Florida Inst Technol, Melbourne, FL 32901 USA

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

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

[18] Hiroshima Univ, Higashihiroshima 7398526, Japan

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

[20] Univ Illinois, Urbana, IL 61801 USA

[21] Acad Sci Czech Republ, Inst Phys, Prague 18221 8, Czech Republic

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

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

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

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

[26] Hungarian Acad Sci MTA KFKI RMKI, KFKI Res Inst Particle & Nucl Phys, H-1525 Budapest, Hungary

[27] Korea Univ, Seoul 136701, South Korea

[28] Kurchatov Inst, Russian Res Ctr, Moscow, Russia

[29] Kyoto Univ, Kyoto 6068502, Japan

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

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

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

[33] Univ Blaise Pascal, CNRS, IN2P3, LPC, F-63177 Clermont Ferrand, Aubiere, France

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

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

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

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

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

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

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

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

[42] Peking Univ, Beijing 100871, Peoples R China

[43] Petersburg Nucl Phys Inst, Gatchina 188300, Leningrad Reg, Russia

[44] RIKEN, Inst Phys & Chem Res, Wako, Saitama 3510198, Japan

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

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

[47] St Petersburg State Polytech Univ, St Petersburg, Russia

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

[49] Seoul Natl Univ, Syst Elect Lab, Seoul, South Korea

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

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 104卷 / 13期

基金：

巴西圣保罗研究基金会;

关键词：

NUCLEUS-NUCLEUS COLLISIONS; THERMAL PHOTONS;

D O I：

10.1103/PhysRevLett.104.132301

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The production of e(+)e(-) pairs for m(e+e-) < 0.3 GeV/c(2) and 1< p(T) < 5 GeV/c is measured in p + p and Au + Au collisions at root s(NN) = 200 GeV. An enhanced yield above hadronic sources is observed. Treating the excess as photon internal conversions, the invariant yield of direct photons is deduced. In central Au + Au collisions, the excess of the direct photon yield over p + p is exponential in transverse momentum, with an inverse slope T = 221 +/- 19(stat) +/- 19(syst) MeV. Hydrodynamical models with initial temperatures ranging from T-init similar to 300-600 MeV at times of similar to 0.6-0.15 fm/c after the collision are in qualitative agreement with the data. Lattice QCD predicts a phase transition to quark gluon plasma at similar to 170 MeV.

引用

页数：6

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