Global polarization of Λ hyperons in Au plus Au collisions at √sNN=200 GeV

被引:235
作者
Adam, J. [9 ]
Adamczyk, L. [1 ]
Adams, J. R. [31 ]
Adkins, J. K. [21 ]
Agakishiev, G. [19 ]
Aggarwal, M. M. [33 ]
Ahammed, Z. [56 ]
Ajitanand, N. N. [44 ]
Alekseev, I [17 ,28 ]
Anderson, D. M. [46 ]
Aoyama, R. [50 ]
Aparin, A. [19 ]
Arkhipkin, D. [3 ]
Aschenauer, E. C. [3 ]
Ashraf, M. U. [49 ]
Atetalla, F. [20 ]
Attri, A. [33 ]
Averichev, G. S. [19 ]
Bai, X. [7 ]
Bairathi, V [29 ]
Barish, K. [52 ]
Bassin, A. J. [52 ]
Behera, A. [44 ]
Bellwied, R. [48 ]
Bhasin, A. [18 ]
Bhati, A. K. [33 ]
Bielcik, J. [10 ]
Bielcikova, J. [11 ]
Bland, L. C. [3 ]
Bordyuzhin, I. G. [17 ]
Brandenburg, J. D. [38 ]
Brandin, A., V [28 ]
Brown, D. [25 ]
Bryslawskyj, J. [52 ]
Bunzarovi, I [19 ]
Butterworth, J. [38 ]
Caines, H. [59 ]
Sanchez, M. Calderon de la Barca [5 ]
Campbell, J. M. [31 ]
Cebra, D. [5 ]
Chakaberia, I [3 ,20 ,42 ]
Chaloupka, P. [10 ]
Chang, F-H [30 ]
Chang, Z. [3 ]
Chankova-Bunzarova, N. [19 ]
Chatterjee, A. [56 ]
Chattopadhyay, S. [56 ]
Chen, J. H. [43 ]
Chen, X. [23 ,41 ]
Cheng, J. [49 ]
机构
[1] AGH Univ Sci & Technol, FPACS, PL-30059 Krakow, Poland
[2] Argonne Natl Lab, Argonne, IL 60439 USA
[3] Brookhaven Natl Lab, Upton, NY 11973 USA
[4] Univ Calif Berkeley, Berkeley, CA 94720 USA
[5] Univ Calif Davis, Davis, CA 95616 USA
[6] Univ Calif Los Angeles, Los Angeles, CA 90095 USA
[7] Cent China Normal Univ, Wuhan 430079, Hubei, Peoples R China
[8] Univ Illinois, Chicago, IL 60607 USA
[9] Creighton Univ, Omaha, NE 68178 USA
[10] Czech Tech Univ, FNSPE, Prague 11519, Czech Republic
[11] Nucl Phys Inst AS CR, Prague 25068, Czech Republic
[12] Tech Univ Darmstadt, D-64289 Darmstadt, Germany
[13] FIAS, D-60438 Frankfurt, Germany
[14] Fudan Univ, Shanghai 200433, Peoples R China
[15] Inst Phys, Bhubaneswar 751005, India
[16] Indiana Univ, Bloomington, IN 47408 USA
[17] Alikhanov Inst Theoret & Expt Phys, Moscow 117218, Russia
[18] Univ Jammu, Jammu 180001, India
[19] Joint Inst Nucl Res, Dubna 141980, Russia
[20] Kent State Univ, Kent, OH 44242 USA
[21] Univ Kentucky, Lexington, KY 40506 USA
[22] Lamar Univ, Phys Dept, Beaumont, TX 77710 USA
[23] Chinese Acad Sci, Inst Modem Phys, Lanzhou 730000, Gansu, Peoples R China
[24] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA
[25] Lehigh Univ, Bethlehem, PA 18015 USA
[26] Max Planck Inst Phys & Astrophys, D-80805 Munich, Germany
[27] Michigan State Univ, E Lansing, MI 48824 USA
[28] Natl Res Nucl Univ MEPhI, Moscow 115409, Russia
[29] HBNI, Natl Inst Sci Educ & Res, Jatni 752050, India
[30] Natl Cheng Kung Univ, Tainan 70101, Taiwan
[31] Ohio State Univ, Columbus, OH 43210 USA
[32] PAN, Inst Nucl Phys, PL-31342 Krakow, Poland
[33] Panjab Univ, Chandigarh 160014, India
[34] Penn State Univ, University Pk, PA 16802 USA
[35] Inst High Energy Phys, Protvino 142281, Russia
[36] Purdue Univ, W Lafayette, IN 47907 USA
[37] Pusan Natl Univ, Pusan 46241, South Korea
[38] Rice Univ, Houston, TX 77251 USA
[39] Rutgers State Univ, Piscataway, NJ 08854 USA
[40] Univ Sao Paulo, BR-05314970 Sao Paulo, Brazil
[41] Univ Sci & Technol China, Hefei 230026, Anhui, Peoples R China
[42] Shandong Univ, Jinan 250100, Shandong, Peoples R China
[43] Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China
[44] SUNY Stony Brook, Stony Brook, NY 11794 USA
[45] Temple Univ, Philadelphia, PA 19122 USA
[46] Texas A&M Univ, College Stn, TX 77843 USA
[47] Univ Texas Austin, Austin, TX 78712 USA
[48] Univ Houston, Houston, TX 77204 USA
[49] Tsinghua Univ, Beijing 100084, Peoples R China
[50] Univ Tsukuba, Tsukuba, Ibaraki 3058571, Japan
基金
中国国家自然科学基金; 新加坡国家研究基金会; 美国国家科学基金会;
关键词
NUCLEAR COLLISIONS; FLOW;
D O I
10.1103/PhysRevC.98.014910
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
Global polarization of Lambda hyperons has been measured to be of the order of a few tenths of a percentage in Au+Au collisions at root s(NN) = 200 GeV, with no significant difference between Lambda and (Lambda) over bar. These new results reveal the collision energy dependence of the global polarization together with the results previously observed at root s(NN) = 7.7-62.4 GeV and indicate noticeable vorticity of the medium created in noncentral heavy-ion collisions at the highest Relativistic Heavy Ion Collider collision energy. The signal is in rough quantitative agreement with the theoretical predictions from a hydrodynamic model and from a multi-phase transport model. The polarization is larger in more peripheral collisions, and depends weakly on the hyperon's transverse momentum and pseudorapidity eta(H) within vertical bar eta(H)vertical bar < 1. An indication of the polarization dependence on the event-by-event charge asymmetry is observed at the 2 sigma level, suggesting a possible contribution to the polarization from the axial current induced by the initial magnetic field.
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页数:10
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  • [1] Spin alignment measurements of the K*0(892) and φ(1020) vector mesons in heavy ion collisions at √SNN=200 GeV
    Abelev, B. I.
    Aggarwal, M. M.
    Ahammed, Z.
    Anderson, B. D.
    Arkhipkin, D.
    Averichev, G. S.
    Bai, Y.
    Balewski, J.
    Barannikova, O.
    Barnby, L. S.
    Baudot, J.
    Baumgart, S.
    Beavis, D. R.
    Bellwied, R.
    Benedosso, F.
    Betts, R. R.
    Bhardwaj, S.
    Bhasin, A.
    Bhati, A. K.
    Bichsel, H.
    Bielcik, J.
    Bielcikova, J.
    Biritz, B.
    Bland, L. C.
    Bombara, M.
    Bonner, B. E.
    Botje, M.
    Bouchet, J.
    Braidot, E.
    Brandin, A. V.
    Bueltmann, S.
    Burton, T. P.
    Bystersky, M.
    Cai, X. Z.
    Caines, H.
    Sanchez, M. Calderon de la Barca
    Callner, J.
    Catu, O.
    Cebra, D.
    Cendejas, R.
    Cervantes, M. C.
    Chajecki, Z.
    Chaloupka, P.
    Chattopadhyay, S.
    Chen, H. F.
    Chen, J. H.
    Chen, J. Y.
    Cheng, J.
    Cherney, M.
    Chikanian, A.
    [J]. PHYSICAL REVIEW C, 2008, 77 (06):
  • [2] System-Size Independence of Directed Flow Measured at the BNL Relativistic Heavy-Ion Collider
    Abelev, B. I.
    Aggarwal, M. M.
    Ahammed, Z.
    Anderson, B. D.
    Arkhipkin, D.
    Averichev, G. S.
    Bai, Y.
    Balewski, J.
    Barannikova, O.
    Barnby, L. S.
    Baudot, J.
    Baumgart, S.
    Beavis, D. R.
    Bellwied, R.
    Benedosso, F.
    Betts, R. R.
    Bhardwaj, S.
    Bhasin, A.
    Bhati, A. K.
    Bichsel, H.
    Bielcik, J.
    Bielcikova, J.
    Biritz, B.
    Bland, L. C.
    Bombara, M.
    Bonner, B. E.
    Botje, M.
    Bouchet, J.
    Braidot, E.
    Brandin, A. V.
    Bueltmann, S.
    Burton, T. P.
    Bystersky, M.
    Cai, X. Z.
    Caines, H.
    Sanchez, M. Calderon de la Barca
    Callner, J.
    Catu, O.
    Cebra, D.
    Cendejas, R.
    Cervantes, M. C.
    Chajecki, Z.
    Chaloupka, P.
    Chattopadhyay, S.
    Chen, H. F.
    Chen, J. H.
    Chen, J. Y.
    Cheng, J.
    Cherney, M.
    Chikanian, A.
    [J]. PHYSICAL REVIEW LETTERS, 2008, 101 (25)
  • [3] Global polarization measurement in Au + Au collisions (vol 76, 2007)
    Abelev, B. I.
    Aggarwal, M. M.
    Ahammed, Z.
    Anderson, B. D.
    Arkhipkin, D.
    Averichev, G. S.
    Bai, Y.
    Balewski, J.
    Barannikova, O.
    Barnby, L. S.
    Baudot, J.
    Baumgart, S.
    Belaga, V. V.
    Bellingeri-Laurikainen, A.
    Bellwied, R.
    Benedosso, F.
    Betts, R. R.
    Bhardwaj, S.
    Bhasin, A.
    Bhati, A. K.
    Bichsel, H.
    Bielcik, J.
    Bielcikova, J.
    Bland, L. C.
    Blyth, S. -L.
    Bombara, M.
    Bonner, B. E.
    Botje, M.
    Bouchet, J.
    Brandin, A. V.
    Burton, T. P.
    Bystersky, M.
    Cai, X. Z.
    Caines, H.
    Sanchez, M. Calderon de la Barca
    Callner, J.
    Catu, O.
    Cebra, D.
    Cervantes, M. C.
    Chajecki, Z.
    Chaloupka, P.
    Chattopadhyay, S.
    Chen, H. F.
    Chen, J. H.
    Chen, J. Y.
    Cheng, J.
    Cherney, M.
    Chikanian, A.
    Christie, W.
    Chung, S. U.
    [J]. PHYSICAL REVIEW C, 2017, 95 (03)
  • [4] STAR detector overview
    Ackermann, KH
    Adams, N
    Adler, C
    Ahammed, Z
    Ahmad, S
    Allgower, C
    Amonett, J
    Amsbaugh, J
    Anderson, BD
    Anderson, M
    Anderssen, E
    Arnesen, H
    Arnold, L
    Averichev, GS
    Baldwin, A
    Balewski, J
    Barannikova, O
    Barnby, LS
    Baudot, J
    Beddo, M
    Bekele, S
    Belaga, VV
    Bellwied, R
    Bennett, S
    Bercovitz, J
    Berger, J
    Betts, W
    Bichsel, H
    Bieser, F
    Bland, LC
    Bloomer, M
    Blyth, CO
    Boehm, J
    Bonner, BE
    Bonnet, D
    Bossingham, R
    Botloi, M
    Boucham, A
    Bouillo, N
    Bouvier, S
    Bradley, K
    Brady, FP
    Brandin, A
    Brown, RL
    Brugalette, G
    Burkes, M
    Cadman, RV
    Caines, H
    Sánchez, MCD
    Cardenas, A
    [J]. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2003, 499 (2-3) : 624 - 632
  • [5] Global Λ hyperon polarization in nuclear collisions
    Adamczyk, L.
    Adkins, J. K.
    Agakishiev, G.
    Aggarwal, M. M.
    Ahammed, Z.
    Ajitanand, N. N.
    Alekseev, I.
    Anderson, D. M.
    Aoyama, R.
    Aparin, A.
    Arkhipkin, D.
    Aschenauer, E. C.
    Ashraf, M. U.
    Attri, A.
    Averichev, G. S.
    Bai, X.
    Bairathi, V.
    Behera, A.
    Bellwied, R.
    Bhasin, A.
    Bhati, A. K.
    Bhattarai, P.
    Bielcik, J.
    Bielcikova, J.
    Bland, L. C.
    Bordyuzhin, I. G.
    Bouchet, J.
    Brandenburg, J. D.
    Brandin, A. V.
    Brown, D.
    Bunzarov, I.
    Butterworth, J.
    Caines, H.
    Sanchez, M. Calderon De la Barca
    Campbell, J. M.
    Cebra, D.
    Chakaberia, I.
    Chaloupka, P.
    Chang, Z.
    Chankova-Bunzarova, N.
    Chatterjee, A.
    Chattopadhyay, S.
    Chen, X.
    Chen, J. H.
    Chen, X.
    Cheng, J.
    Cherney, M.
    Christie, W.
    Contin, G.
    Crawford, H. J.
    [J]. NATURE, 2017, 548 (7665) : 62 - +
  • [6] Beam-Energy Dependence of the Directed Flow of Protons, Antiprotons, and Pions in Au plus Au Collisions
    Adamczyk, L.
    Adkins, J. K.
    Agakishiev, G.
    Aggarwal, M. M.
    Ahammed, Z.
    Alekseev, I.
    Alford, J.
    Anson, C. D.
    Aparin, A.
    Arkhipkin, D.
    Aschenauer, E. C.
    Averichev, G. S.
    Banerjee, A.
    Beavis, D. R.
    Bellwied, R.
    Bhasin, A.
    Bhati, A. K.
    Bhattarai, P.
    Bichsel, H.
    Bielcik, J.
    Bielcikova, J.
    Bland, L. C.
    Bordyuzhin, I. G.
    Borowski, W.
    Bouchet, J.
    Brandin, A. V.
    Brovko, S. G.
    Bueltmann, S.
    Bunzarov, I.
    Burton, T. P.
    Butterworth, J.
    Caines, H.
    Sanchez, M. Calderon de la Barca
    Cebra, D.
    Cendejas, R.
    Cervantes, M. C.
    Chaloupka, P.
    Chang, Z.
    Chattopadhyay, S.
    Chen, H. F.
    Chen, J. H.
    Chen, L.
    Cheng, J.
    Cherney, M.
    Chikanian, A.
    Christie, W.
    Chwastowski, J.
    Codrington, M. J. M.
    Contin, G.
    Cramer, J. G.
    [J]. PHYSICAL REVIEW LETTERS, 2014, 112 (16)
  • [7] Elliptic flow of identified hadrons in Au + Au collisions at √sNN=7.7-62.4 GeV
    Adamczyk, L.
    Adkins, J. K.
    Agakishiev, G.
    Aggarwal, M. M.
    Ahammed, Z.
    Alekseev, I.
    Alford, J.
    Anson, C. D.
    Aparin, A.
    Arkhipkin, D.
    Aschenauer, E.
    Averichev, G. S.
    Balewski, J.
    Banerjee, A.
    Barnovska, Z.
    Beavis, D. R.
    Bellwied, R.
    Betancourt, M. J.
    Betts, R. R.
    Bhasin, A.
    Bhati, A. K.
    Bhattarai, P.
    Bichsel, H.
    Bielcik, J.
    Bielcikova, J.
    Bland, L. C.
    Bordyuzhin, I. G.
    Borowski, W.
    Bouchet, J.
    Brandin, A. V.
    Brovko, S. G.
    Bruna, E.
    Bueltmann, S.
    Bunzarov, I.
    Burton, T. P.
    Butterworth, J.
    Cai, X. Z.
    Caines, H.
    Sanchez, M. Calderon de la Barca
    Cebra, D.
    Cendejas, R.
    Cervantes, M. C.
    Chaloupka, P.
    Chang, Z.
    Chattopadhyay, S.
    Chen, H. F.
    Chen, J. H.
    Chen, J. Y.
    Chen, L.
    Cheng, J.
    [J]. PHYSICAL REVIEW C, 2013, 88 (01):
  • [8] Inclusive charged hadron elliptic flow in Au plus Au collisions at √sNN=7.7-39 GeV
    Adamczyk, L.
    Agakishiev, G.
    Aggarwal, M. M.
    Ahammed, Z.
    Alakhverdyants, A. V.
    Alekseev, I.
    Alford, J.
    Anderson, B. D.
    Anson, C. D.
    Arkhipkin, D.
    Aschenauer, E.
    Averichev, G. S.
    Balewski, J.
    Banerjee, A.
    Barnovska, Z.
    Beavis, D. R.
    Bellwied, R.
    Betancourt, M. J.
    Betts, R. R.
    Bhasin, A.
    Bhati, A. K.
    Bichsel, H.
    Bielcik, J.
    Bielcikova, J.
    Bland, L. C.
    Bordyuzhin, I. G.
    Borowski, W.
    Bouchet, J.
    Brandin, A. V.
    Brovko, S. G.
    Bruna, E.
    Bueltmann, S.
    Bunzarov, I.
    Burton, T. P.
    Butterworth, J.
    Cai, X. Z.
    Caines, H.
    Sanchez, M. Calderon de la Barca
    Cebra, D.
    Cendejas, R.
    Cervantes, M. C.
    Chaloupka, P.
    Chang, Z.
    Chattopadhyay, S.
    Chen, H. F.
    Chen, J. H.
    Chen, J. Y.
    Chen, L.
    Cheng, J.
    Cherney, M.
    [J]. PHYSICAL REVIEW C, 2012, 86 (05)
  • [9] Adamczyk L., PHYS REV C
  • [10] Directed flow in Au plus Au collisions at √sNN=62.4 GeV -: art. no. 034903
    Adams, J
    Aggarwal, MM
    Ahammed, Z
    Amonett, J
    Anderson, BD
    Arkhipkin, D
    Averichev, GS
    Badyal, SK
    Bai, Y
    Balewski, J
    Barannikova, O
    Barnby, LS
    Baudot, J
    Bekele, S
    Belaga, VV
    Bellingeri-Laurikainen, A
    Bellwied, R
    Berger, J
    Bezverkhny, BI
    Bharadwaj, S
    Bhasin, A
    Bhati, AK
    Bhatia, VS
    Bichsel, H
    Bielcik, J
    Bielcikova, J
    Billmeier, A
    Bland, LC
    Blyth, CO
    Blyth, SL
    Bonner, BE
    Botje, M
    Boucham, A
    Bouchet, J
    Brandin, AV
    Bravar, A
    Bystersky, M
    Cadman, RV
    Cai, XZ
    Caines, H
    Sánchez, MCD
    Castillo, J
    Catu, O
    Cebra, D
    Chajecki, Z
    Chaloupka, P
    Chattopadhyay, S
    Chen, HF
    Chen, JH
    Chen, Y
    [J]. PHYSICAL REVIEW C, 2006, 73 (03):