Low-pT direct-photon production in Au plus Au collisions at √sNN=39 and 62.4 GeV

被引:8
作者
Abdulameer, N. J. [16 ]
Acharya, U. [21 ]
Adare, A. [11 ]
Aidala, C. [41 ,47 ]
Ajitanand, N. N. [68 ]
Akiba, Y. [62 ,63 ]
Akimoto, R. [10 ]
Al-Ta'ani, H. [55 ]
Alexander, J. [68 ]
Alfred, M. [24 ]
Angerami, A. [12 ,13 ]
Aoki, K. [34 ,62 ]
Apadula, N. [29 ,69 ]
Aramaki, Y. [10 ,62 ]
Asano, H. [37 ,62 ]
Aschenauer, E. C. [7 ]
Atomssa, E. T. [69 ]
Awes, T. C. [58 ]
Azmoun, B. [7 ]
Babintsev, V. [25 ]
Bai, M. [6 ]
Bannier, B. [69 ]
Barish, K. N. [8 ]
Bassalleck, B. [54 ]
Bathe, S. [5 ,63 ]
Baublis, V. [60 ]
Baumgart, S. [62 ]
Bazilevsky, A. [7 ]
Belmont, R. [11 ,56 ,75 ]
Berdnikov, A. [65 ]
Berdnikov, Y. [65 ]
Bichon, L. [75 ]
Blankenship, B. [75 ]
Blau, D. S. [36 ,53 ]
Bok, J. S. [54 ,55 ,78 ]
Borisov, V. [65 ]
Boyle, K. [63 ]
Brooks, M. L. [41 ]
Buesching, H. [7 ]
Bumazhnov, V. [25 ]
Butsyk, S. [54 ]
Campbell, S. [12 ,13 ,69 ]
Roman, V. Canoa [69 ]
Castera, P. [69 ]
Chen, C. -H. [63 ,69 ]
Chiu, M. [7 ]
Chi, C. Y. [12 ,13 ]
Choi, I. J. [26 ]
Choi, J. B. [31 ]
Choi, S. [67 ]
机构
[1] Abilene Christian Univ, Abilene, TX 79699 USA
[2] Augustana Univ, Dept Phys, Sioux Falls, SD 57197 USA
[3] Banaras Hindu Univ, Dept Phys, Varanasi 221005, Uttar Pradesh, India
[4] Bhabha Atom Res Ctr, Bombay 400085, Maharashtra, India
[5] CUNY, Baruch Coll, New York, NY 10010 USA
[6] Brookhaven Natl Lab, Collider Accelerator Dept, Upton, NY 11973 USA
[7] Brookhaven Natl Lab, Phys Dept, Upton, NY 11973 USA
[8] Univ Calif Riverside, Riverside, CA 92521 USA
[9] Charles Univ Prague, Ovocny Trh 5,Praha 1, Prague 11636, Czech Republic
[10] Univ Tokyo, Grad Sch Sci, Ctr Nucl Study, 7-3-1 Hongo, Tokyo 1130033, Japan
[11] Univ Colorado, Boulder, CO 80309 USA
[12] Columbia Univ, New York, NY 10027 USA
[13] Nevis Labs, Irvington, NY 10533 USA
[14] Czech Tech Univ, Zikova 4, Prague 16636 6, Czech Republic
[15] CEA Saclay, Dapnia, F-91191 Gif Sur Yvette, France
[16] Debrecen Univ, Egyet Ter 1, H-4010 Debrecen, Hungary
[17] Eotvos Lorand Univ, ELTE, Pazmany Ps 1-A, H-1117 Budapest, Hungary
[18] Ewha Womans Univ, Seoul 120750, South Korea
[19] Florida A&M Univ, Tallahassee, FL 32307 USA
[20] Florida State Univ, Tallahassee, FL 32306 USA
[21] Georgia State Univ, Atlanta, GA 30303 USA
[22] Hanyang Univ, Seoul 133792, South Korea
[23] Hiroshima Univ, Higashihiroshima 7398526, Japan
[24] Howard Univ, Dept Phys & Astron, Washington, DC 20059 USA
[25] Inst High Energy Phys, State Res Ctr Russian Federat, IHEP Protvino, Protvino 142281, Russia
[26] Univ Illinois, Urbana, IL 61801 USA
[27] Russian Acad Sci, Inst Nucl Res, Prospekt 60 Letiya Oktyabrya 7a, Moscow 117312, Russia
[28] Acad Sci Czech Republ, Inst Phys, Na Slovance 2, Prague 18221 8, Czech Republic
[29] Iowa State Univ, Ames, IA 50011 USA
[30] Japan Atom Energy Agcy, Adv Sci Res Ctr, 2-4 Shirakata Shirane, Tokai, Ibaraki 3191195, Japan
[31] Jeonbuk Natl Univ, Jeonju 54896, South Korea
[32] Helsinki Inst Phys, POB 35, FI-40014 Jyvaskyla, Finland
[33] Univ Jyvaskyla, POB 35, FI-40014 Jyvaskyla, Finland
[34] High Energy Accelerator Res Org, KEK, Tsukuba, Ibaraki 3050801, Japan
[35] Korea Univ, Seoul 02841, South Korea
[36] Kurchatov Inst, Natl Res Ctr, Moscow 123098, Russia
[37] Kyoto Univ, Kyoto 6068502, Japan
[38] Ecole Polytech, Lab Leprince Ringuet, CNRS, IN2P3, Route Saclay, F-91128 Palaiseau, France
[39] Lahore Univ Management Sci, Phys Dept, Lahore 54792, Pakistan
[40] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA
[41] Los Alamos Natl Lab, Los Alamos, NM 87545 USA
[42] Univ Blaise Pascal, CNRS, IN2P3, LPC, F-63177 Aubiere, France
[43] Lund Univ, Dept Phys, Box 118, SE-22100 Lund, Sweden
[44] Univ Maryland, College Pk, MD 20742 USA
[45] Univ Massachusetts, Dept Phys, Amherst, MA 01003 USA
[46] MATE, Lab Femtoscopy, Karoly Robert Campus,Matraiut 36, H-3200 Gyongyos, Hungary
[47] Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA
[48] Mississippi State Univ, Mississippi State, MS 39762 USA
[49] Muhlenberg Coll, Allentown, PA 18104 USA
[50] Myongji Univ, Yongin 449728, Kyonggido, South Korea
基金
美国国家科学基金会; 日本学术振兴会; 以色列科学基金会;
关键词
ROOT-S(NN)=200 GEV; PHENIX; DETECTOR;
D O I
10.1103/PhysRevC.107.024914
中图分类号
O57 [原子核物理学、高能物理学];
学科分类号
070202 ;
摘要
The measurement of direct photons from Au + Au collisions at ,/sNN = 39 and 62.4 GeV in the transverse-momentum range 0.4 < pT < 3 Gev/c is presented by the PHENIX collaboration at the BNLRelativistic Heavy Ion Collider. A significant direct-photon yield is observed in both collision systems. A universal scaling is observed when the direct-photon pT spectra for different center-of-mass energies and for different centrality selections at ,/sNN = 62.4 GeV is scaled with (dNch/d eta)alpha for alpha = 1.21 +/- 0.04. This scaling also holds true for direct-photon spectra from Au + Au collisions at ,/sNN = 200 GeV measured earlier by PHENIX, as well as the spectra from Pb + Pb at ,/sNN = 2760 GeV published by ALICE. The scaling power alpha seems to be independent of pT, center of mass energy, and collision centrality. The spectra from different collision energies have a similar shape up to pT of 2 Gev/c. The spectra have a local inverse slope Teff increasing with pT of 0.174 +/- 0.018 Gev/c in the range 0.4 < pT < 1.3 Gev/c and increasing to 0.289 +/- 0.024 Gev/c for 0.9 < pT < 2.1 Gev/c. The observed similarity of low-pT direct-photon production from ,/sNN = 39 to 2760 GeV suggests a common source of direct photons for the different collision energies and event centrality selections, and suggests a comparable space-time evolution of direct-photon emission.
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页数:17
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