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：76

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

来源：

PHYSICAL REVIEW LETTERS | 2018年 / 121卷 / 13期

基金：

美国国家科学基金会; 新加坡国家研究基金会; 中国国家自然科学基金;

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.

引用

页数：8

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