Measurement of an Excess in the Yield of J/ψ at Very Low pT in Pb-Pb Collisions at √sNN=2.76 TeV

被引：98

作者：

Adam, J. ^{[53
]}

Adamova, D. ^{[97
]}

Aggarwal, M. M. ^{[101
]}

Rinella, G. Aglieri ^{[49
]}

Agnello, M. ^{[124
]}

Agrawal, N. ^{[61
]}

Ahammed, Z. ^{[146
]}

Ahn, S. U. ^{[81
]}

Aiola, S. ^{[150
]}

Akindinov, A. ^{[71
]}

Alam, S. N. ^{[146
]}

Aleksandrov, D. ^{[93
]}

Alessandro, B. ^{[124
]}

Alexandre, D. ^{[115
]}

Molina, R. Alfaro ^{[77
]}

Alici, A. ^{[13
,14
,118
]}

Alkin, A. ^{[2
]}

Almaraz, J. R. M. ^{[133
]}

Alme, J. ^{[51
]}

Alt, T. ^{[56
]}

Altinpinar, S. ^{[21
]}

Altsybeev, I. ^{[145
]}

Alves Garcia Prado, C. ^{[134
]}

Andrei, C. ^{[91
]}

Andronic, A. ^{[110
,111
]}

Anguelov, V. ^{[107
]}

Anielski, J. ^{[67
]}

Anticic, T. ^{[112
]}

Antinori, F. ^{[121
]}

Antonioli, P. ^{[118
]}

Aphecetche, L. ^{[127
]}

Appelshaeuser, H. ^{[66
]}

Arcelli, S. ^{[35
,36
]}

Arnaldi, R. ^{[123
]}

Arnold, O. W. ^{[50
,106
]}

Arsene, I. C. ^{[25
]}

Arslandok, M.

Audurier, B. ^{[127
]}

Augustinus, A. ^{[49
]}

Averbeck, R. ^{[110
,111
]}

Azmi, M. D. ^{[22
]}

Badala, A. ^{[120
]}

Baek, Y. W. ^{[80
]}

Bagnasco, S. ^{[124
]}

Bailhache, R. ^{[66
]}

Bala, R. ^{[104
]}

Baldisseri, A. ^{[17
]}

Baral, R. C. ^{[74
]}

Barbano, A. M. ^{[33
,34
]}

Barbera, R. ^{[37
,38
]}

机构：

[1] Benemerita Univ Autonoma Puebla, Puebla, Mexico

[2] Bogolyubov Inst Theoret Phys, Kiev, Ukraine

[3] Bose Inst, Dept Phys, Kolkata, India

[4] Ctr Astroparticle Phys & Space Sci, Kolkata, India

[5] Budker Inst Nucl Phys, Novosibirsk 630090, Russia

[6] Calif Polytech State Univ San Luis Obispo, San Luis Obispo, CA 93407 USA

[7] Cent China Normal Univ, Wuhan, Peoples R China

[8] IN2P3, Ctr Calcul, Villeurbanne, France

[9] Ctr Aplicac Tecnol & Desarrollo Nucl CEADEN, Havana, Cuba

[10] CIEMAT, E-28040 Madrid, Spain

[11] Ctr Invest & Estudios Avanzados CINVESTAV, Mexico City, DF, Mexico

[12] Ctr Invest & Estudios Avanzados CINVESTAV, Merida, Mexico

[13] Museo Storico Fis, Ctr Fermi, Rome, Italy

[14] Ctr Studi & Ric Enrico Fermi, Rome, Italy

[15] Chicago State Univ, Chicago, IL USA

[16] China Inst Atom Energy, Beijing, Peoples R China

[17] IRFU, Commissariat Energie Atom, Saclay, France

[18] COMSATS Inst Informat Technol CIIT, Islamabad, Pakistan

[19] Univ Santiago de Compostela, Dept Fis Particulas, Santiago De Compostela, Spain

[20] Univ Santiago de Compostela, IGFAE, Santiago De Compostela, Spain

[21] Univ Bergen, Dept Phys & Technol, Bergen, Norway

[22] Aligarh Muslim Univ, Dept Phys, Aligarh 202002, Uttar Pradesh, India

[23] Ohio State Univ, Dept Phys, 174 W 18th Ave, Columbus, OH 43210 USA

[24] Sejong Univ, Dept Phys, Seoul, South Korea

[25] Univ Oslo, Dept Phys, Oslo, Norway

[26] Politecn Bari, Dipartimento Elettrotecn & Elettron, Bari, Italy

[27] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy

[28] Sezione Ist Nazl Fis Nucl, Rome, Italy

[29] Univ Cagliari, Dipartimento Fis, Cagliari, Italy

[30] Sezione Ist Nazl Fis Nucl, Cagliari, Italy

[31] Univ Trieste, Dipartmento Fis, I-34127 Trieste, Italy

[32] Sezione Ist Nazl Fis Nucl, Trieste, Italy

[33] Univ Turin, Dipartimento Fis, Turin, Italy

[34] Sezione Ist Nazl Fis Nucl, Turin, Italy

[35] Univ Bologna, Dipartimento Fis & Astron, Bologna, Italy

[36] Sezione Ist Nazl Fis Nucl, Bologna, Italy

[37] Univ Catania, Dipartmento Fis & Astron, Catania, Italy

[38] Sezione Ist Nazl Fis Nucl, Catania, Italy

[39] Univ Padua, Dipartimento Fis & Astron, Padua, Italy

[40] Sezione Ist Nazl Fis Nucl, Padua, Italy

[41] Univ Salerno, Dipartimento Fis ER Caianiello, I-84100 Salerno, Italy

[42] Grp Collegato INFN, Salerno, Italy

[43] Univ Piemonte Orientale, Dipartimento Sci & Innovaz Tecnol, Alessandria, Italy

[44] Grp Collegato INFN, Alessandria, Italy

[45] Dipartimento Interateneo Fis M Merlin, Bari, Italy

[46] Sezione Ist Nazl Fis Nucl, Bari, Italy

[47] Lund Univ, Div Expt High Energy, Lund, Sweden

[48] Univ Tubingen, Tubingen, Germany

[49] CERN, European Org Nucl Res, CH-1211 Geneva, Switzerland

[50] Tech Univ Munich, Excellence Cluster Univ, D-80290 Munich, Germany

来源：

PHYSICAL REVIEW LETTERS | 2016年 / 116卷 / 22期

基金：

美国能源部; 新加坡国家研究基金会; 俄罗斯基础研究基金会; 巴西圣保罗研究基金会; 欧洲研究理事会; 芬兰科学院; 美国国家科学基金会; 英国科学技术设施理事会; 中国国家自然科学基金; 瑞典研究理事会;

关键词：

TRANSVERSE-MOMENTUM DEPENDENCE; PP COLLISIONS; RAPIDITY; PHOTOPRODUCTION; SUPPRESSION; CHARMONIUM; E(+)E(-);

D O I：

10.1103/PhysRevLett.116.222301

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report on the first measurement of an excess in the yield of J/psi at very low transverse momentum (pT < 0.3 GeV/c) in peripheral hadronic Pb-Pb collisions at root s(NN) = 2.76 TeV, performed by ALICE at the CERN LHC. Remarkably, the measured nuclear modification factor of J/psi in the rapidity range 2.5 < y < 4 reaches about 7 (2) in the p(T) range 0-0.3 GeV/c in the 70%-90% (50%-70%) centrality class. The J/psi production cross section associated with the observed excess is obtained under the hypothesis that coherent photoproduction of J/psi is the underlying physics mechanism. If confirmed, the observation of J/psi coherent photoproduction in Pb-Pb collisions at impact parameters smaller than twice the nuclear radius opens new theoretical and experimental challenges and opportunities. In particular, coherent photoproduction accompanying hadronic collisions may provide insight into the dynamics of photoproduction and nuclear reactions, as well as become a novel probe of the quark-gluon plasma.

引用

页数：13

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