Global and local polarization of A hyperons in Au plus Au collisions at 200 GeV from STAR

被引：70

作者：

Niida, Takafumi ^{[1
]}

Adam, J. ^{[13
]}

Adamczyk, L. ^{[3
]}

Adams, J. R. ^{[36
]}

Adkins, J. K. ^{[27
]}

Agakishiev, G. ^{[25
]}

Aggarwal, M. M. ^{[38
]}

Ahammed, Z. ^{[58
]}

Alekseev, I. ^{[4
,32
]}

Anderson, D. M. ^{[52
]}

Aoyama, R. ^{[55
]}

Aparin, A. ^{[25
]}

Arkhipkin, D. ^{[6
]}

Aschenauer, E. C. ^{[6
]}

Ashraf, M. U. ^{[54
]}

Atetalla, F. ^{[53
]}

Attri, A. ^{[38
]}

Averichev, G. S. ^{[25
]}

Bai, X. ^{[11
]}

Bairathi, V. ^{[33
,48
]}

Barish, K. ^{[10
]}

Bassill, A. J. ^{[10
]}

Behera, A. ^{[50
]}

Beliwied, R. ^{[20
]}

Bhasin, A. ^{[24
]}

Bhati, A. K. ^{[38
]}

Bielcik, J. ^{[14
]}

Bielcikova, J. ^{[35
]}

Bland, L. C. ^{[6
]}

Bordyuzhin, I. G. ^{[4
]}

Brandenburg, J. D. ^{[43
]}

Brandin, A. V. ^{[32
]}

Brown, D. ^{[29
]}

Bryslawskyj, J. ^{[10
]}

Bunzarov, I. ^{[25
]}

Butterworth, J. ^{[43
]}

Caines, H. ^{[61
]}

Sanchez, M. Calderon de la Barca ^{[8
]}

Cebra, D. ^{[8
]}

Chakaberia, I. ^{[26
,47
]}

Chaloupka, P. ^{[14
]}

Chan, B. K. ^{[9
]}

Chang, F-H. ^{[34
]}

Chang, Z. ^{[6
]}

Chankova-Bunzarova, N. ^{[25
]}

Chatterjee, A. ^{[58
]}

Chattopadhyay, S. ^{[58
]}

Chen, J. H. ^{[48
]}

Chen, X. ^{[22
,46
]}

机构：

[1] Wayne State Univ, 666 W Hancock, Detroit, MI 48201 USA

[2] Abilene Christian Univ, Abilene, TX 79699 USA

[3] AGH Univ Sci & Technol, FPACS, PL-30059 Krakow, Poland

[4] Alikhanov Inst Theoret & Expt Phys, Moscow 117218, Russia

[5] Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA

[6] Brookhaven Natl Lab, Upton, NY 11973 USA

[7] Univ Calif Berkeley, Berkeley, CA 94720 USA

[8] Univ Calif Davis, Davis, CA 95616 USA

[9] Univ Calif Los Angeles, Los Angeles, CA 90095 USA

[10] Univ Calif Riverside, Riverside, CA 92521 USA

[11] Cent China Normal Univ, Wuhan 430079, Hubei, Peoples R China

[12] Univ Illinois, Chicago, IL 60607 USA

[13] Creighton Univ, Omaha, NE 68178 USA

[14] Czech Tech Univ, FNSPE, Prague 11519, Czech Republic

[15] Tech Univ Darmstadt, D-64289 Darmstadt, Germany

[16] Eotvos Lorand Univ, H-1117 Budapest, Hungary

[17] FIAS, D-60438 Frankfurt, Germany

[18] Fudan Univ, Shanghai 200433, Peoples R China

[19] Heidelberg Univ, D-69120 Heidelberg, Germany

[20] Univ Houston, Houston, TX 77204 USA

[21] Indiana Univ, Bloomington, IN 47408 USA

[22] Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Gansu, Peoples R China

[23] Inst Phys, Bhubaneswar 751005, India

[24] Univ Jammu, Jammu 180001, India

[25] Joint Inst Nucl Res, Dubna 141980, Russia

[26] Kent State Univ, Kent, OH 44242 USA

[27] Univ Kentucky, Lexington, KY 40506 USA

[28] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA

[29] Lehigh Univ, Bethlehem, PA 18015 USA

[30] Max Planck Inst Phys & Astrophys, D-80805 Munich, Germany

[31] Michigan State Univ, E Lansing, MI 48824 USA

[32] Natl Res Nucl Univ MEPhI, Moscow 115409, Russia

[33] HBNI, Natl Inst Sci Educ & Res, Jatni 752050, India

[34] Natl Cheng Kung Univ, Tainan 70101, Taiwan

[35] Nucl Phys Inst CAS, Rez 25068, Czech Republic

[36] Ohio State Univ, Columbus, OH 43210 USA

[37] Inst Nucl Phys PAN, PL-31342 Krakow, Poland

[38] Panjab Univ, Chandigarh 160014, India

[39] Penn State Univ, University Pk, PA 16802 USA

[40] Inst High Energy Phys, Protvino 142281, Russia

[41] Purdue Univ, W Lafayette, IN 47907 USA

[42] Pusan Natl Univ, Pusan 46241, South Korea

[43] Rice Univ, Houston, TX 77251 USA

[44] Rutgers State Univ, Piscataway, NJ 08854 USA

[45] Univ Sao Paulo, BR-05314970 Sao Paulo, Brazil

[46] Univ Sci & Technol China, Hefei 230026, Anhui, Peoples R China

[47] Shandong Univ, Qingdao 266237, Shandong, Peoples R China

[48] Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China

[49] Southern Connecticut State Univ, New Haven, CT 06515 USA

[50] SUNY Stony Brook, Stony Brook, NY 11794 USA

来源：

NUCLEAR PHYSICS A | 2019年 / 982卷

关键词：

NUCLEAR COLLISIONS;

D O I：

10.1016/j.nuclphysa.2018.08.034

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

New results on global polarization of A hyperons in Au+Au collisions at root s(NN) = 200 GeV reveal non-zero signal on the order of a few tenths of a percent. Compared with lower energy results, the current measurement shows that the polarization decreases at higher collision energy, the trend being well reproduced by theoretical calculations. The polarization is found to be larger in more peripheral collisions, as well as in the in-plane than in the out-of-plane direction. The signal seems to depend on the asymmetry between positive and negative charge in each event, which may indicate an influence of the axial current induced by the magnetic field. In addition, the first measurement of a local polarization along the beam direction was performed. The results show a quadrupole modulation relative to the second-order event plane, as expected from the elliptic flow.

引用

页码：511 / 514

页数：4

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