Low-pT e+e- Pair Production in Au plus Au Collisions at √sNN=200 GeV and U plus U Collisions at √sNN=193 GeV at STAR

被引:90
作者
Adam, J. [9 ]
Adamczyk, L. [1 ]
Adams, J. R. [31 ]
Adkins, J. K. [21 ]
Agakishiev, G. [19 ]
Aggarwal, M. M. [33 ]
Ahammed, Z. [56 ]
Ajitanand, N. N. [44 ]
Alekseev, I. [17 ,28 ]
Anderson, D. M. [46 ]
Aoyama, R. [50 ]
Aparin, A. [19 ]
Arkhipkin, D. [3 ]
Aschenauer, E. C. [3 ]
Ashraf, M. U. [49 ]
Atetalla, F. [20 ]
Attri, A. [33 ]
Averichev, G. S. [19 ]
Bai, X. [7 ]
Bairathi, V. [29 ]
Barish, K. [52 ]
Bassill, A. J. [52 ]
Behera, A. [44 ]
Bellwied, R. [48 ]
Bhasin, A. [18 ]
Bhati, A. K. [33 ]
Bielcik, J. [10 ]
Bielcikova, J. [11 ]
Bland, L. C. [3 ]
Bordyuzhin, I. G. [17 ]
Brandenburg, J. D. [38 ]
Brandin, A. V. [28 ]
Brown, D. [25 ]
Bryslawskyj, J. [52 ]
Bunzarov, I. [19 ]
Butterworth, J. [38 ]
Caines, H. [59 ]
Sanchez, M. Calderon de la Barca [5 ]
Campbell, J. M. [31 ]
Cebra, D. [5 ]
Chakaberia, I. [3 ,20 ,42 ]
Chaloupka, P. [10 ]
Chang, F-H. [30 ]
Chang, Z. [3 ]
Chankova-Bunzarova, N. [19 ]
Chatterjee, A. [56 ]
Chattopadhyay, S. [56 ]
Chen, J. H. [43 ]
Chen, X. [23 ,41 ]
Cheng, J. [49 ]
机构
[1] AGH Univ Sci & Technol, FPACS, PL-30059 Krakow, Poland
[2] Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA
[3] Brookhaven Natl Lab, Upton, NY 11973 USA
[4] Univ Calif Berkeley, Berkeley, CA 94720 USA
[5] Univ Calif Davis, Davis, CA 95616 USA
[6] Univ Calif Los Angeles, Los Angeles, CA 90095 USA
[7] Cent China Normal Univ, Wuhan 430079, Hubei, Peoples R China
[8] Univ Illinois, Chicago, IL 60607 USA
[9] Creighton Univ, Omaha, NE 68178 USA
[10] Czech Tech Univ, FNSPE, Prague 11519, Czech Republic
[11] Nucl Phys Inst AS CR, Prague 25068, Czech Republic
[12] Tech Univ Darmstadt, D-64289 Darmstadt, Germany
[13] FIAS, D-60438 Frankfurt, Germany
[14] Fudan Univ, Shanghai 200433, Peoples R China
[15] Inst Phys, Bhubaneswar 751005, India
[16] Indiana Univ, Bloomington, IN 47408 USA
[17] Alikhanov Inst Theoret & Expt Phys, Moscow 117218, Russia
[18] Univ Jammu, Jammu 180001, India
[19] Joint Inst Nucl Res, Dubna 141980, Russia
[20] Kent State Univ, Kent, OH 44242 USA
[21] Univ Kentucky, Lexington, KY 40506 USA
[22] Lamar Univ, Beaumont, TX 77710 USA
[23] Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Gansu, Peoples R China
[24] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA
[25] Lehigh Univ, Bethlehem, PA 18015 USA
[26] Max Planck Inst Phys & Astrophys, D-80805 Munich, Germany
[27] Michigan State Univ, E Lansing, MI 48824 USA
[28] Natl Res Nucl Univ MEPhI, Moscow 115409, Russia
[29] HBNI, Natl Inst Sci Educ & Res, Jatni 752050, India
[30] Natl Cheng Kung Univ, Tainan 70101, Taiwan
[31] Ohio State Univ, Columbus, OH 43210 USA
[32] Inst Nucl Phys PAN, PL-31342 Krakow, Poland
[33] Panjab Univ, Chandigarh 160014, India
[34] Penn State Univ, University Pk, PA 16802 USA
[35] Inst High Energy Phys, Protvino 142281, Russia
[36] Purdue Univ, W Lafayette, IN 47907 USA
[37] Pusan Natl Univ, Pusan 46241, South Korea
[38] Rice Univ, Houston, TX 77251 USA
[39] Rutgers State Univ, Piscataway, NJ 08854 USA
[40] Univ Sao Paulo, BR-05314970 Sao Paulo, Brazil
[41] Univ Sci & Technol China, Hefei 230026, Anhui, Peoples R China
[42] Shandong Univ, Jinan 250100, Shandong, Peoples R China
[43] Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China
[44] SUNY Stony Brook, Stony Brook, NY 11794 USA
[45] Temple Univ, Philadelphia, PA 19122 USA
[46] Texas A&M Univ, College Stn, TX 77843 USA
[47] Univ Texas Austin, Austin, TX 78712 USA
[48] Univ Houston, Houston, TX 77204 USA
[49] Tsinghua Univ, Beijing 100084, Peoples R China
[50] Univ Tsukuba, Tsukuba, Ibaraki 3058571, Japan
基金
中国国家自然科学基金; 新加坡国家研究基金会; 美国国家科学基金会;
关键词
QUARK-GLUON PLASMA; PERIPHERAL COLLISIONS; MASS E(+)E(-); CERN-SPS; PHOTOPRODUCTION; MULTIPLICITY; PERSPECTIVE; DEPENDENCE; DILEPTONS; PHYSICS;
D O I
10.1103/PhysRevLett.121.132301
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We report first measurements of e(+)e(-) pair production in the mass region 0.4 < M-ee < 2.6 GeV/c(2) at low transverse momentum (p(T) < 0.15 GeV/c) in noncentral Au + Au collisions at root s(NN) = 200 GeV and U + U collisions at root s(NN) = 193 GeV. Significant enhancement factors, expressed as ratios of data over known hadronic contributions, are observed in the 40%-80% centrality of these collisions. The excess yields peak distinctly at low p(T) with a width (root < p(T)(2)>) between 40 and 60 MeV/c. The absolute cross section of the excess depends weakly on centrality, while those from a theoretical model calculation incorporating an in-medium broadened rho spectral function and radiation from a quark gluon plasma or hadronic cocktail contributions increase dramatically with an increasing number of participant nucleons. Model calculations of photon-photon interactions generated by the initial projectile and target nuclei describe the observed excess yields but fail to reproduce the p(T)(2) distributions.
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页数:8
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