First measurement of quarkonium polarization in nuclear collisions at the LHC

被引：17

作者：

Acharya, S. ^{[155
]}

Adamova, D. ^{[107
]}

Adler, A. ^{[87
]}

Adolfsson, J. ^{[93
]}

Aggarwal, M. M. ^{[112
]}

Rinella, G. Aglieri ^{[46
]}

Agnello, M. ^{[40
,41
]}

Agrawal, N. ^{[12
,66
]}

Ahammed, Z. ^{[155
]}

Ahmad, S. ^{[18
]}

Ahn, S. U. ^{[89
]}

Akbar, Z.

Akindinov, A. ^{[104
]}

Al-Turany, M. ^{[119
,120
]}

Alam, S. N. ^{[155
]}

Albuquerque, D. S. D. ^{[136
]}

Aleksandrov, D. ^{[100
]}

Alessandro, B. ^{[71
]}

Alfanda, H. M. ^{[7
]}

Alfaro Molina, R. ^{[84
]}

Ali, B. ^{[18
]}

Ali, Y. ^{[16
]}

Alici, A. ^{[12
,32
,33
,66
]}

Alizadehvandchali, N.

Alkin, A. ^{[2
]}

Alme, J. ^{[23
]}

Alt, T. ^{[81
]}

Altenkamper, L. ^{[23
]}

Altsybeev, I. ^{[126
]}

Anaam, M. N. ^{[7
]}

Andrei, C. ^{[60
]}

Andreou, D. ^{[46
]}

Andrews, H. A. ^{[124
]}

Andronic, A. ^{[158
]}

Angeletti, M. ^{[46
]}

Anguelov, V. ^{[116
]}

Anson, C. ^{[17
]}

Anticic, T. ^{[121
]}

Antinori, F. ^{[69
]}

Antonioli, P. ^{[66
]}

Anwar, R. ^{[139
]}

Apadula, N. ^{[92
]}

Aphecetche, L. ^{[128
]}

Appelshaeuser, H. ^{[81
]}

Arcelli, S. ^{[32
,33
]}

Arnaldi, R. ^{[71
]}

Arratia, M. ^{[92
]}

Arsene, I. C. ^{[22
]}

Arslandok, M. ^{[116
]}

Augustinus, A. ^{[46
]}

机构：

[1] AI AlikhanyanNat Sci Lab Yerevan Phys Inst Fdn, Yerevan, Armenia

[2] Natl Acad Sci Ukraine, Bogolyubov Inst Theoret Phys, Kiev, Ukraine

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

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

[5] Budker Inst Nucl Phys, Novosibirsk, 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] Ctr Invest Estudios Avanzados CINVESTAV, Mexico City, DF, Mexico

[11] Ctr Invest Estudios Avanzados CINVESTAV, Merida, Yucatan, Mexico

[12] Ctr Fermi Museo Storico Fis & Ctr Studi & Ricerch, Rome, Italy

[13] Chicago State Univ, Chicago, IL USA

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

[15] Comenius Univ, Fac Math Phys & Informat, Bratislava, Slovakia

[16] COMSATS Univ Islamabad, Islamabad, Pakistan

[17] Creighton Univ, Omaha, NE 68178 USA

[18] Aligarh Muslim Univ, Dept Phys, Aligarh, Uttar Pradesh, India

[19] Pusan Natl Univ, Dept Phys, Pusan, South Korea

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

[21] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

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

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

[24] Univ Roma La Sapienza, Dipartimento Fis, Rome, Italy

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

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

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

[28] Univ Trieste, Dipartimento Fis, Trieste, Italy

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

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

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

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

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

[34] Univ Catania, Dipartimento Fis & Astron, Catania, Italy

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

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

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

[38] Univ Salerno, Dipartimento Fis ER Caianiello, Salerno, Italy

[39] Grp Collegato INFN, Salerno, Italy

[40] Politecn Torino, Dipartimento DISAT, Turin, Italy

[41] Sezi INFN, Turin, Italy

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

[43] INFN, Sez Torino, Alessandria, Italy

[44] Dipartimento Interateneo & Fis M Merlin, Bari, Italy

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

[46] European Org Nucl Res CERN, Geneva, Switzerland

[47] Univ Split, Fac Elect Engn Mech Engn & Naval Architecture, Split, Croatia

[48] Western Norway Univ Appl Sci, Fac Engn & Sci, Bergen, Norway

[49] Czech Tech Univ, Fac Nucl Sci & Phys Engn, Prague, Czech Republic

[50] Safarik Univ, Fac Sci, Kosice, Slovakia

来源：

PHYSICS LETTERS B | 2021年 / 815卷

基金：

瑞典研究理事会; 中国国家自然科学基金; 巴西圣保罗研究基金会; 日本学术振兴会; 英国科学技术设施理事会; 新加坡国家研究基金会; 俄罗斯科学基金会; 美国国家科学基金会; 美国能源部; 奥地利科学基金会; 俄罗斯基础研究基金会;

关键词：

P(P)OVER-BAR COLLISIONS; J/PSI PRODUCTION; PP COLLISIONS; SUPPRESSION; RAPIDITY; MATTER;

D O I：

10.1016/j.physletb.2021.136146

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The polarization of inclusive J/psi and Upsilon(1S) produced in Pb-Pb collisions at root s(NN) = 5.02 TeV at the LHC is measured with the ALICE detector. The study is carried out by reconstructing the quarkonium through its decay to muon pairs in the rapidity region 2.5 < y < 4 and measuring the polar and azimuthal angular distributions of the muons. The polarization parameters lambda(theta), lambda(phi) and lambda(theta phi) are measured in the helicity and Collins-Soper reference frames, in the transverse momentum interval 2 < p(T) < 10 GeV/c and p(T) < 15 GeV/c for the J/psi and Upsilon(1S), respectively. The polarization parameters for the J/psi are found to be compatible with zero, within a maximum of about two standard deviations at low p(T), for both reference frames and over the whole p(T) range. The values are compared with the corresponding results obtained for pp collisions at root s = 7 and 8 TeV in a similar kinematic region by the ALICE and LHCb experiments. Although with much larger uncertainties, the polarization parameters for Upsilon(1S) production in Pb-Pb collisions are also consistent with zero. (c) 2021 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

引用

页数：13

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