Dielectron production in Au plus Au collisions at √sNN=200 GeV

被引：51

作者：

Adare, A. ^{[13
]}

Aidala, C. ^{[42
,47
]}

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

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

Akimoto, R. ^{[12
]}

Alexander, J. ^{[66
]}

Alfred, M. ^{[25
]}

Al-Ta'ani, H. ^{[54
]}

Angerami, A. ^{[14
,15
]}

Aoki, K. ^{[35
,60
]}

Apadula, N. ^{[30
,67
]}

Aramaki, Y. ^{[12
,60
]}

Asano, H. ^{[38
,60
]}

Aschenauer, E. C. ^{[7
]}

Atomssa, E. T. ^{[67
]}

Averbeck, R. ^{[67
]}

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

Azmoun, B. ^{[7
]}

Babintsev, V. ^{[26
]}

Bai, M. ^{[6
]}

Bandara, N. S. ^{[46
]}

Bannier, B. ^{[67
]}

Barish, K. N. ^{[8
]}

Bassalleck, B. ^{[53
]}

Bathe, S. ^{[5
,61
]}

Baublis, V. ^{[59
]}

Baumgart, S. ^{[60
]}

Bazilevsky, A. ^{[7
]}

Beaumier, M. ^{[8
]}

Beckman, S. ^{[13
]}

Belmont, R. ^{[13
,47
,71
]}

Berdnikov, A. ^{[63
]}

Berdnikov, Y. ^{[63
]}

Blau, D. S. ^{[37
]}

Bok, J. S. ^{[53
,54
]}

Boyle, K. ^{[61
]}

Brooks, M. L. ^{[42
]}

Bryslawskyj, J. ^{[5
]}

Buesching, H. ^{[7
]}

Bumazhnov, V. ^{[26
]}

Butsyk, S. ^{[53
]}

Campbell, S. ^{[14
,15
,30
,67
]}

Castera, P. ^{[67
]}

Chen, C. -H. ^{[61
,67
]}

Chi, C. Y. ^{[14
,15
]}

Chiu, M. ^{[7
]}

Choi, I. J. ^{[27
]}

Choi, J. B. ^{[10
]}

Choi, S. ^{[65
]}

Choudhury, R. K. ^{[4
]}

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, Dept Phys, Upton, NY 11973 USA

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

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

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

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

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

[13] Univ Colorado, Boulder, CO 80309 USA

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

[15] Nevis Labs, Irvington, NY 10533 USA

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

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

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

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

[20] Ewha Womans Univ, Seoul 120750, South Korea

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

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

[23] Hanyang Univ, Seoul 133792, South Korea

[24] Hiroshima Univ, Higashihiroshima 7398526, Japan

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

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

[27] Univ Illinois, Urbana, IL 61801 USA

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

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

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

[31] Japan Atom Energy Agcy, Adv Sci Res Ctr, Tokai, Ibaraki 3191195, Japan

[32] Helsinki Inst Phys, FI-40014 Jyvaskyla, Finland

[33] Univ Jyvaskyla, FI-40014 Jyvaskyla, Finland

[34] Karoly Roberts Univ Coll, H-3200 Gyongyos, Hungary

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

[36] Korea Univ, Seoul 136701, South Korea

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

[38] Kyoto Univ, Kyoto 6068502, Japan

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

[40] Lahore Univ Management Sci, Phys Dept, Lahore 54792, Pakistan

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

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

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

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

[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] Muhlenberg Coll, Allentown, PA 18104 USA

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

[50] Nara Womens Univ, Nara 6308506, Japan

来源：

PHYSICAL REVIEW C | 2016年 / 93卷 / 01期

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：

ELECTRON-POSITRON PAIRS; HADRON BLIND DETECTOR; LOW-MASS DILEPTONS; ENHANCED PRODUCTION; CERN-SPS; PHENIX EXPERIMENT; CONSTRUCTION; PERFORMANCE; SPECTRA;

D O I：

10.1103/PhysRevC.93.014904

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 present measurements of e(+)e-production at midrapidity in Au + Au collisions at root s(NN) = 200 GeV. The invariant yield is studied within the PHENIX detector acceptance over a wide range of mass (m(ee) < 5 GeV/c(2)) and pair transverse momentum (p(T) < 5 GeV/c) for minimum bias and for five centrality classes. The e(+)e(-) yield is compared to the expectations from known sources. In the low-mass region (m(ee) = 0.30-0.76 GeV/c(2)) there is an enhancement that increases with centrality and is distributed over the entire pair p(T) range measured. It is significantly smaller than previously reported by the PHENIX experiment and amounts to 2.3 +/- 0.4(stat) +/- 0.4(syst) +/- 0.2(model) or to 1.7 +/- 0.3(stat) +/- 0.3(syst) +/- 0.2(model) for minimum bias collisions when the open heavy-flavor contribution is calculated with PYTHIA or MC@NLO, respectively. The inclusive mass and p(T) distributions, as well as the centrality dependence, are well reproduced by model calculations where the enhancement mainly originates from the melting of the rho meson resonance as the system approaches chiral symmetry restoration. In the intermediate-mass region (m(ee) = 1.2-2.8 GeV/c(2)), the data hint at a significant contribution in addition to the yield from the semileptonic decays of heavy-flavor mesons.

引用

页数：34

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