Probing the Effects of Strong Electromagnetic Fields with Charge-Dependent Directed Flow in Pb-Pb Collisions at the LHC

被引：82

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] 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] INFN, Grp Collegato, 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 / 02期

基金：

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

关键词：

MAGNETIC-FIELD; QCD;

D O I：

10.1103/PhysRevLett.125.022301

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The first measurement at the LHC of charge-dependent directed flow (v(1)) relative to the spectator plane is presented for Pb-Pb collisions at root s(NN) = 5.02 TeV. Results are reported for charged hadrons and D-0 mesons for the transverse momentum intervals p(T) > 0.2 GeV/c and 3 < p(T) < 6 GeV/c in the 5%-40% and 10%-40% centrality classes, respectively. The difference between the positively and negatively charged hadron v(1) has a positive slope as a function of pseudorapidity eta, d Delta v(1)/d eta = [1.68 +/- 0.49(stat) +/- 0.41(syst)] x 10(-4). The same measurement for D-0 and (D) over bar (0) mesons yields a positive value d Delta v(1)/d eta = [4.9 +/- 1.7(stat)] +/- 0.6(syst)] x 10(-1), which is about 3 orders of magnitude larger than the one of the charged hadrons. These measurements can provide new insights into the effects of the strong electromagnetic field and the initial tilt of matter created in noncentral heavy ion collisions on the dynamics of light (u, d, and s) and heavy (c) quarks. The large difference between the observed Delta v(1) of charged hadrons and D-0 mesons may reflect different sensitivity of the charm and light quarks to the early time dynamics of a heavy ion collision. These observations challenge some recent theoretical calculations, which predicted a negative and an order of magnitude smaller value of d Delta v(1)/d eta for both light flavor and charmed hadrons.

引用

页数：13

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