Evidence of Spin-Orbital Angular Momentum Interactions in Relativistic Heavy-Ion Collisions

被引：94

作者：

Acharya, S. ^{[155
]}

Adamova, D. ^{[107
]}

Adler, A. ^{[87
]}

Adolfsson, J. ^{[93
]}

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

Rinella, G. Aglieri ^{[46
]}

Agnello, M. ^{[32
,41
]}

Agrawal, N. ^{[12
,13
,66
]}

Ahammed, Z. ^{[155
]}

Ahmad, S. ^{[19
]}

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

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. ^{[19
]}

Ali, Y. ^{[17
]}

Alici, A. ^{[12
,13
,33
,34
,66
]}

Alkin, A. ^{[2
]}

Alme, J. ^{[24
]}

Alt, T. ^{[81
]}

Altenkamper, L. ^{[24
]}

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. ^{[18
]}

Anticic, T. ^{[121
]}

Antinori, F. ^{[69
]}

Antonioli, P. ^{[66
]}

Anwar, R. ^{[139
]}

Apadula, N. ^{[92
]}

Aphecetche, L. ^{[128
]}

Appelshaeuser, H. ^{[81
]}

Arcelli, S. ^{[33
,34
]}

Arnaldi, R. ^{[71
]}

Arratia, M. ^{[92
]}

Arsene, I. C. ^{[23
]}

Arslandok, M. ^{[116
]}

Augustinus, A. ^{[46
]}

Averbeck, R. ^{[119
,120
]}

Aziz, S. ^{[74
]}

机构：

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

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

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

[4] Bose Inst, 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, Lyon, France

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

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

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

[12] Museo Stor Fis, Ctr Fermi, Rome, Italy

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

[14] Chicago State Univ, Chicago, IL USA

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

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

[17] COMSATS Univ Islamabad, Islamabad, Pakistan

[18] Creighton Univ, Omaha, NE 68178 USA

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

[40] Grp Collegato INFN, Salerno, Italy

[41] Politecn Torino, Dipartimento DISAT, 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] CERN, European Org Nucl Res, 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：

PHYSICAL REVIEW LETTERS | 2020年 / 125卷 / 01期

基金：

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

关键词：

GLOBAL POLARIZATION; ALIGNMENT; MESONS; LAMBDA; QCD;

D O I：

10.1103/PhysRevLett.125.012301

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The first evidence of spin alignment of vector mesons (K*(0) and phi) in heavy-ion collisions at the Large Hadron Collider (LHC) is reported. The spin density matrix element rho(00) is measured at midrapidity (vertical bar y vertical bar < 0.5) in Pb-Pb collisions at a center-of-mass energy root(s)NNof 2.76 TeV with the ALICE detector. rho(00) values are found to be less than 1/3 (1/3 implies no spin alignment) at low transverse momentum (p(T) < 2 GeV / c) for K*(0) and phi at a level of 3 sigma and 2 sigma, respectively. No significant spin alignment is observed for the K-S(0) meson (spin = 0) in Pb-Pb collisions and for the vector mesons in pp collisions. The measured spin alignment is unexpectedly large but qualitatively consistent with the expectation from models which attribute it to a polarization of quarks in the presence of angular momentum in heavy-ion collisions and a subsequent hadronization by the process of recombination.

引用

页数：12

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