Evolution of π0 Suppression in Au plus Au Collisions from √sNN=39 to 200 GeV

被引：46

作者：

Adare, A. ^{[12
]}

Afanasiev, S. ^{[29
]}

Aidala, C. ^{[38
]}

Ajitanand, N. N. ^{[58
]}

Akiba, Y. ^{[52
,53
]}

Akimoto, R. ^{[11
]}

Al-Ta'ani, H. ^{[47
]}

Alexander, J. ^{[58
]}

Angerami, A. ^{[13
,14
]}

Aoki, K. ^{[52
]}

Apadula, N. ^{[1
]}

Aramaki, Y. ^{[11
,52
]}

Asano, H. ^{[35
,52
]}

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

Atomssa, E. T. ^{[1
]}

Awes, T. C. ^{[49
]}

Azmoun, B. ^{[7
]}

Babintsev, V. ^{[24
]}

Bai, M. ^{[6
]}

Bannier, B. ^{[1
]}

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

Bassalleck, B. ^{[46
]}

Bathe, S. ^{[5
,53
]}

Baublis, V. ^{[51
]}

Baumgart, S. ^{[52
]}

Bazilevsky, A. ^{[7
]}

Belmont, R. ^{[62
]}

Berdnikov, A. ^{[55
]}

Berdnikov, Y. ^{[55
]}

Bing, X. ^{[48
]}

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

Boyle, K. ^{[53
]}

Brooks, M. L. ^{[38
]}

Buesching, H. ^{[7
]}

Bumazhnov, V. ^{[24
]}

Butsyk, S. ^{[46
]}

Campbell, S. ^{[1
]}

Castera, P. ^{[1
]}

Chen, C. -H. ^{[1
]}

Chi, C. Y. ^{[13
,14
]}

Chiu, M. ^{[7
]}

Choi, I. J. ^{[25
]}

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

Choi, S. ^{[57
]}

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

Christiansen, P. ^{[40
]}

Chujo, T. ^{[61
]}

Chvala, O. ^{[8
]}

Cianciolo, V. ^{[49
]}

Citron, Z. ^{[1
]}

机构：

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

[2] Abilene Christian Univ, Abilene, TX 79699 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, Czech Republic

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

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

[12] Univ Colorado, Boulder, CO 80309 USA

[13] Nevis Labs, Irvington, NY 10533 USA

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

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

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

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

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

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

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

[25] Univ Illinois, Urbana, IL 61801 USA

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

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

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

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

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

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

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

[33] Korea Univ, Seoul 136701, South Korea

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

[35] Kyoto Univ, Kyoto 6068502, Japan

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

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

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

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

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

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

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

[43] Muhlenberg Coll, Allentown, PA 18104 USA

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

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

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

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

[48] Ohio Univ, Dept Phys & Astron, Athens, OH 45701 USA

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

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

来源：

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

基金：

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

关键词：

INCLUSIVE PROCESSES;

D O I：

10.1103/PhysRevLett.109.152301

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Neutral-pion pi(0) spectra were measured at midrapidity (vertical bar y vertical bar < 0.35) in Au + Au collisions at root s(NN) = 39 and 62.4 GeV and compared with earlier measurements at 200 GeV in a transverse-momentum range of 1 < p(T) < 10 GeV/c. The high-p(T) tail is well described by a power law in all cases, and the powers decrease significantly with decreasing center-of-mass energy. The change of powers is very similar to that observed in the corresponding spectra for p + p collisions. The nuclear modification factors (RAA) show significant suppression, with a distinct energy, centrality, and p(T) dependence. Above p(T) = 7 GeV/c, R-AA is similar for root sNN = 62.4 and 200 GeV at all centralities. Perturbative-quantum-chromodynamics calculations that describe R-AA well at 200 GeV fail to describe the 39 GeV data, raising the possibility that, for the same p(T) region, the relative importance of initial-state effects and soft processes increases at lower energies. The p(T) range where pi(0) spectra in central Au + Au collisions have the same power as in p + p collisions is approximate to 5 and 7 GeV/c for root sNN = 200 and 62.4 GeV, respectively. For the root sNN = 39 GeV data, it is not clear whether such a region is reached, and the x(T) dependence of the x(T)-scaling power-law exponent is very different from that observed in the root sNN = 62 and 200 GeV data, providing further evidence that initial-state effects and soft processes mask the in-medium suppression of hardscattered partons to higher p(T) as the collision energy decreases.

引用

页数：7

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