Low-momentum direct-photon measurement in Cu plus Cu collisions at √SNN=200 GeV

被引：17

作者：

Adare, A. ^{[12
]}

Afanasiev, S. ^{[31
]}

Aidala, C. ^{[13
,14
,47
]}

Ajitanand, N. N. ^{[66
]}

Akiba, Y. ^{[60
,61
]}

Al-Bataineh, H. ^{[54
]}

Alexander, J. ^{[66
]}

Alfred, M. ^{[24
]}

Aoki, K. ^{[34
,37
,60
]}

Aphecetche, L. ^{[68
]}

Armendariz, R. ^{[54
]}

Aronson, S. H. ^{[6
]}

Asai, J. ^{[61
]}

Atomssa, E. T. ^{[38
]}

Averbeck, R. ^{[67
]}

Awes, T. C. ^{[56
]}

Azmoun, B. ^{[6
]}

Babintsev, V ^{[25
]}

Bagoly, A. ^{[18
]}

Baksay, G. ^{[20
]}

Baksay, L. ^{[20
]}

Baldisseri, A. ^{[16
]}

Barish, K. N. ^{[7
]}

Barnes, P. D. ^{[41
]}

Bassalleck, B. ^{[53
]}

Bathe, S. ^{[4
,7
,61
]}

Batsouli, S. ^{[56
]}

Baublis, V ^{[59
]}

Bazilevsky, A. ^{[6
]}

Belikov, S. ^{[6
]}

Belmont, R. ^{[12
]}

Bennett, R. ^{[67
]}

Berdnikov, A. ^{[63
]}

Berdnikov, Y. ^{[63
]}

Bickley, A. A. ^{[12
]}

Boer, M. ^{[41
]}

Boissevain, J. G. ^{[41
]}

Bok, J. S. ^{[54
]}

Borel, H. ^{[16
]}

Boyle, K. ^{[61
,67
]}

Brooks, M. L. ^{[41
]}

Bryslawskyj, J. ^{[7
]}

Buesching, H. ^{[6
]}

Bumazhnov, V ^{[25
]}

Bunce, G. ^{[6
,61
]}

Butsyk, S. ^{[41
,67
]}

Campbell, S. ^{[13
,14
,67
]}

Roman, V. Canoa ^{[67
]}

Chang, B. S. ^{[76
]}

Charvet, J-L ^{[16
]}

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] CUNY, Baruch Coll, New York, NY 10010 USA

[5] Brookhaven Natl Lab, Collider Accelerator Dept, Upton, NY 11973 USA

[6] Brookhaven Natl Lab, Phys Dept, Upton, NY 11973 USA

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

[8] Charles Univ Prague, Ovocny Trh 5, Prague 11636 1, Czech Republic

[9] Chonbuk Natl Univ, Jeonju 561756, South Korea

[10] China Inst Atom Energy, Sci & Technol Nucl Data Lab, Beijing 102413, Peoples R China

[11] Univ Tokyo, Ctr Nucl Study, Grad Sch Sci, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan

[12] Univ Colorado, Boulder, CO 80309 USA

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

[14] Nevis Labs, Irvington, NY 10533 USA

[15] Czech Tech Univ, Zikova 4, Prague 16636 6, Czech Republic

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

[17] Debrecen Univ, Egyet Ter 1, H-4010 Debrecen, Hungary

[18] Eotvos Lorand Univ, ELTE, Pazmany Ps 1-A, H-1117 Budapest, Hungary

[19] Eszterhazy Karoly Univ, Karoly Robert Campus,Matrai Ut 36, H-3200 Gyongyos, Hungary

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

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

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

[23] Hiroshima Univ, Higashihiroshima 7398526, Japan

[24] Howard Univ, Dept Phys & Astron, Washington, DC 20059 USA

[25] State Res Ctr Russian Federat, Inst High Energy Phys, 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] Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia

[32] Helsinki Inst Phys, 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 136701, South Korea

[36] Natl Res Ctr Kurchatov Inst, Moscow 123098, Russia

[37] Kyoto Univ, Kyoto 6068502, Japan

[38] CNRS, Lab Leprince Ringuet, Ecole Polytech, 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, IN2P3, LPC, CNRS, F-63177 Aubiere, France

[43] Lund Univ, Dept Phys, Box 118, SE-22100 Lund, Sweden

[44] Univ Lyon 1, Univ Lyon, CNRS, IPNL,IN2P3, F-69622 Villeurbanne, France

[45] Univ Maryland, College Pk, MD 20742 USA

[46] Univ Massachusetts, Dept Phys, Amherst, MA 01003 USA

[47] Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA

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

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

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

来源：

PHYSICAL REVIEW C | 2018年 / 98卷 / 05期

基金：

以色列科学基金会; 日本学术振兴会; 美国国家科学基金会;

关键词：

AU COLLISIONS;

D O I：

10.1103/PhysRevC.98.054902

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：

We measured direct photons for p(T) < 5 GeV/c in minimum bias and 0%-40% most-central events at midrapidity for Cu+Cu collisions at root S-NN = 200 GeV. The e(+)e(-) contribution from quasireal direct virtual photons has been determined as an excess over the known hadronic contributions in the e(+)e(-) mass distribution. A clear enhancement of photons over the binary scaled p+p fit is observed for p(T) < 4 GeV/c in Cu+Cu data. The p(T) spectra are consistent with the Au+Au data covering a similar number of participants. The inverse slopes of the exponential fits to the excess after subtraction of the p+p baseline are 285 +/- 53 (stat) +/- 57(syst) MeV/c and 333 +/- 72(stat) +/- 45(syst) MeV/c for minimum bias and 0%-40% most-central events, respectively. The rapidity density, dN / dy, of photons demonstrates the same power law as a function of dN(ch)/d eta observed in Au+Au at the same collision energy.

引用

页数：11

共 50 条

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Adare, A.
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Azmoun, B.
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Baksay, G.
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Bannier, B.
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Buesching, H.
Bumazhnov, V.
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