Global polarization of Λ and (Λ)over-bar hyperons in Au plus Au collisions at √sNN=19.6 and 27GeV

被引：18

作者：

Abdulhamid, M. I. ^{[4
]}

Aboona, B. E. ^{[56
]}

Adam, J. ^{[16
]}

Adamczyk, L. ^{[2
]}

Adams, J. R. ^{[40
]}

Aggarwal, I. ^{[42
]}

Aggarwal, M. M. ^{[42
]}

Ahammed, Z. ^{[63
]}

Anderson, D. M. ^{[56
]}

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

Aslam, S. ^{[27
]}

Atchison, J. ^{[1
]}

Bairathi, V. ^{[54
]}

Baker, W. ^{[12
]}

Cap, J. G. Ball ^{[23
]}

Barish, K. ^{[12
]}

Bellwied, R. ^{[23
]}

Bhagat, P. ^{[30
]}

Bhasin, A. ^{[30
]}

Bhatta, S. ^{[53
]}

Bielcik, J. ^{[16
]}

Bielcikova, J. ^{[39
]}

Brandenburg, J. D. ^{[40
]}

Butterworth, J. ^{[44
]}

Cai, X. Z. ^{[51
]}

Caines, H. ^{[66
]}

Sanchez, M. Calderon de la Barca ^{[10
]}

Cebra, D. ^{[10
]}

Ceska, J. ^{[16
]}

Chakaberia, I. ^{[33
]}

Chaloupka, P. ^{[16
]}

Chan, B. K. ^{[11
]}

Chang, Z. ^{[28
]}

Chatterjee, A. ^{[18
]}

Chen, D. ^{[12
]}

Chen, J. ^{[50
]}

Chen, J. H. ^{[21
]}

Chen, Z. ^{[50
]}

Cheng, J. ^{[58
]}

Cheng, Y. ^{[11
]}

Choudhury, S. ^{[21
]}

Christie, W. ^{[6
]}

Chu, X. ^{[6
]}

Crawford, H. J. ^{[9
]}

Csanad, M. ^{[19
]}

Dale-Gau, G. ^{[14
]}

Das, A. ^{[16
]}

Daugherity, M. ^{[1
]}

Deppner, I. M. ^{[22
]}

Dhamija, A. ^{[42
]}

机构：

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

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

[3] Argonne Natl Lab, Argonne, IL 60439 USA

[4] Amer Univ Cairo, New Cairo 11835, Egypt

[5] Ball State Univ, Muncie, IN 47306 USA

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

[7] Univ Calabria, I-87036 Arcavacata Di Rende, Italy

[8] INFN Cosenza, I-87036 Arcavacata Di Rende, Italy

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

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

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

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

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

[14] Univ Illinois, Chicago, IL 60607 USA

[15] Creighton Univ, Omaha, NE 68178 USA

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

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

[18] Natl Inst Technol Durgapur, Durgapur 713209, India

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

[20] Frankfurt Inst Adv Studies FIAS, D-60438 Frankfurt, Germany

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

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

[23] Univ Houston, Houston, TX 77204 USA

[24] Huzhou Univ, Huzhou 313000, Zhejiang, Peoples R China

[25] Indian Inst Sci Educ & Res IISER, Berhampur 760010, India

[26] Indian Inst Sci Educ & Res IISER Tirupati, Tirupati 517507, Andhra Pradesh, India

[27] Indian Inst Technol, Patna 801106, Bihar, India

[28] Indiana Univ, Bloomington, IN 47408 USA

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

[30] Univ Jammu, Jammu 180001, India

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

[32] Univ Kentucky, Lexington, KY 40506 USA

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

[34] Lehigh Univ, Bethlehem, PA 18015 USA

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

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

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

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

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

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

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

[42] Panjab Univ, Chandigarh 160014, India

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

[44] Rice Univ, Houston, TX 77251 USA

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

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

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

[48] South China Normal Univ, Guangzhou 510631, Guangdong, Peoples R China

[49] Sejong Univ, Seoul 05006, South Korea

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

来源：

PHYSICAL REVIEW C | 2023年 / 108卷 / 01期

基金：

美国国家科学基金会; 新加坡国家研究基金会; 日本学术振兴会; 中国国家自然科学基金;

关键词：

ELLIPTIC FLOW; VORTICITY;

D O I：

10.1103/PhysRevC.108.014910

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：

In relativistic heavy-ion collisions, a global spin polarization, P-H, of Lambda and (Lambda) over bar hyperons along the direction of the system angular momentum was discovered and measured across a broad range of collision energies and demonstrated a trend of increasing P-H with decreasing root sNN. A splitting between Lambda and (Lambda) over bar polarization may be possible due to their different magnetic moments in a late-stage magnetic field sustained by the quark-gluon plasma which is formed in the collision. The results presented in this study find no significant splitting at the collision energies of root s(NN) = 19.6 and 27 GeV in the BNL Relativistic Heavy Ion Collisions Beam Energy Scan Phase II using the STAR detector, with an upper limit of P ((Lambda)) over bar - P-Lambda < 0.24% and P<((Lambda))over bar> - P-Lambda < 0.35%, respectively, at a 95% confidence level. We derive an upper limit on the naive extraction of the late-stage magnetic field of B < 9.4 x 10(12) T and B < 1.4 x 10(13) T at root s(NN) = 19.6 and 27 GeV, respectively, although more thorough derivations are needed. Differential measurements of P-H were performed with respect to collision centrality, transverse momentum, and rapidity. With our current acceptance of |y| < 1 and uncertainties, we observe no dependence on transverse momentum and rapidity in this analysis. These results challenge multiple existing model calculations following a variety of different assumptions which have each predicted a strong dependence on rapidity in this collision-energy range.

引用

页数：9

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