Phys. Rev. C
76,
024915
(2007)
[10 pages]
Global polarization measurement in Au+Au collisions
B. I. Abelev et al. STAR Collaboration
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B. I. Abelev9, M. M. Aggarwal30, Z. Ahammed45, B. D. Anderson20, D. Arkhipkin13, G. S. Averichev12, Y. Bai28, J. Balewski17, O. Barannikova9, L. S. Barnby2, J. Baudot18, S. Baumgart50, V. V. Belaga12, A. Bellingeri-Laurikainen40, R. Bellwied48, F. Benedosso28, R. R. Betts9, S. Bhardwaj35, A. Bhasin19, A. K. Bhati30, H. Bichsel47, J. Bielcik50, J. Bielcikova50, L. C. Bland3, S.-L. Blyth22, M. Bombara2, B. E. Bonner36, M. Botje28, J. Bouchet40, A. V. Brandin26, T. P. Burton2, M. Bystersky11, X. Z. Cai39, H. Caines50, M. Calderón de la Barca Sánchez6, J. Callner9, O. Catu50, D. Cebra6, M. C. Cervantes41, Z. Chajecki29, P. Chaloupka11, S. Chattopadhyay45, H. F. Chen38, J. H. Chen39, J. Y. Chen49, J. Cheng43, M. Cherney10, A. Chikanian50, W. Christie3, S. U. Chung3, R. F. Clarke41, M. J. M. Codrington41, J. P. Coffin18, T. M. Cormier48, M. R. Cosentino37, J. G. Cramer47, H. J. Crawford5, D. Das45, S. Dash15, M. Daugherity42, M. M. de Moura37, T. G. Dedovich12, M. DePhillips3, A. A. Derevschikov32, L. Didenko3, T. Dietel14, P. Djawotho17, S. M. Dogra19, X. Dong22, J. L. Drachenberg41, J. E. Draper6, F. Du50, V. B. Dunin12, J. C. Dunlop3, M. R. Dutta Mazumdar45, W. R. Edwards22, L. G. Efimov12, V. Emelianov26, J. Engelage5, G. Eppley36, B. Erazmus40, M. Estienne18, P. Fachini3, R. Fatemi23, J. Fedorisin12, A. Feng49, P. Filip13, E. Finch50, V. Fine3, Y. Fisyak3, J. Fu49, C. A. Gagliardi41, L. Gaillard2, M. S. Ganti45, E. Garcia-Solis9, V. Ghazikhanian7, P. Ghosh45, Y. N. Gorbunov10, H. Gos46, O. Grebenyuk28, D. Grosnick44, B. Grube34, S. M. Guertin7, K. S. F. F. Guimaraes37, A. Gupta19, N. Gupta19, B. Haag6, T. J. Hallman3, A. Hamed41, J. W. Harris50, W. He17, M. Heinz50, T. W. Henry41, S. Heppelmann31, B. Hippolyte18, A. Hirsch33, E. Hjort22, A. M. Hoffman23, G. W. Hoffmann42, D. J. Hofman9, R. S. Hollis9, M. J. Horner22, H. Z. Huang7, E. W. Hughes4, T. J. Humanic29, G. Igo7, A. Iordanova9, P. Jacobs22, W. W. Jacobs17, P. Jakl11, P. G. Jones2, E. G. Judd5, S. Kabana40, K. Kang43, J. Kapitan11, M. Kaplan8, D. Keane20, A. Kechechyan12, D. Kettler47, V. Yu. Khodyrev32, J. Kiryluk22, A. Kisiel29, E. M. Kislov12, S. R. Klein22, A. G. Knospe50, A. Kocoloski23, D. D. Koetke44, T. Kollegger14, M. Kopytine20, L. Kotchenda26, V. Kouchpil11, K. L. Kowalik22, P. Kravtsov26, V. I. Kravtsov32, K. Krueger1, C. Kuhn18, A. I. Kulikov12, A. Kumar30, P. Kurnadi7, A. A. Kuznetsov12, M. A. C. Lamont50, J. M. Landgraf3, S. Lange14, S. LaPointe48, F. Laue3, J. Lauret3, A. Lebedev3, R. Lednicky13, C.-H. Lee34, S. Lehocka12, M. J. LeVine3, C. Li38, Q. Li48, Y. Li43, G. Lin50, X. Lin49, S. J. Lindenbaum27, M. A. Lisa29, F. Liu49, H. Liu38, J. Liu36, L. Liu49, T. Ljubicic3, W. J. Llope36, R. S. Longacre3, W. A. Love3, Y. Lu49, T. Ludlam3, D. Lynn3, G. L. Ma39, J. G. Ma7, Y. G. Ma39, D. P. Mahapatra15, R. Majka50, L. K. Mangotra19, R. Manweiler44, S. Margetis20, C. Markert42, L. Martin40, H. S. Matis22, Yu. A. Matulenko32, T. S. McShane10, A. Meschanin32, J. Millane23, M. L. Miller23, N. G. Minaev32, S. Mioduszewski41, A. Mischke28, J. Mitchell36, B. Mohanty22, D. A. Morozov32, M. G. Munhoz37, B. K. Nandi16, C. Nattrass50, T. K. Nayak45, J. M. Nelson2, C. Nepali20, P. K. Netrakanti33, L. V. Nogach32, S. B. Nurushev32, G. Odyniec22, A. Ogawa3, V. Okorokov26, D. Olson22, M. Pachr11, S. K. Pal45, Y. Panebratsev12, A. I. Pavlinov48, T. Pawlak46, T. Peitzmann28, V. Perevoztchikov3, C. Perkins5, W. Peryt46, S. C. Phatak15, M. Planinic51, J. Pluta46, N. Poljak51, N. Porile33, A. M. Poskanzer22, M. Potekhin3, E. Potrebenikova12, B. V. K. S. Potukuchi19, D. Prindle47, C. Pruneau48, N. K. Pruthi30, J. Putschke22, I. A. Qattan17, R. Raniwala35, S. Raniwala35, R. L. Ray42, D. Relyea4, A. Ridiger26, H. G. Ritter22, J. B. Roberts36, O. V. Rogachevskiy12, J. L. Romero6, A. Rose22, C. Roy40, L. Ruan3, M. J. Russcher28, R. Sahoo15, I. Sakrejda22, T. Sakuma23, S. Salur50, J. Sandweiss50, M. Sarsour41, P. S. Sazhin12, J. Schambach42, R. P. Scharenberg33, N. Schmitz24, J. Seger10, I. Selyuzhenkov48, P. Seyboth24, A. Shabetai18, E. Shahaliev12, M. Shao38, M. Sharma30, W. Q. Shen39, S. S. Shimanskiy12, E. P. Sichtermann22, F. Simon23, R. N. Singaraju45, N. Smirnov50, R. Snellings28, P. Sorensen3, J. Sowinski17, J. Speltz18, H. M. Spinka1, B. Srivastava33, A. Stadnik12, T. D. S. Stanislaus44, D. Staszak7, R. Stock14, M. Strikhanov26, B. Stringfellow33, A. A. P. Suaide37, M. C. Suarez9, N. L. Subba20, M. Sumbera11, X. M. Sun22, Z. Sun21, B. Surrow23, T. J. M. Symons22, A. Szanto de Toledo37, J. Takahashi37, A. H. Tang3, T. Tarnowsky33, J. H. Thomas22, A. R. Timmins2, S. Timoshenko26, M. Tokarev12, T. A. Trainor47, S. Trentalange7, R. E. Tribble41, O. D. Tsai7, J. Ulery33, T. Ullrich3, D. G. Underwood1, G. Van Buren3, N. van der Kolk28, M. van Leeuwen22, A. M. Vander Molen25, R. Varma16, I. M. Vasilevski13, A. N. Vasiliev32, R. Vernet18, S. E. Vigdor17, Y. P. Viyogi15, S. Vokal12, S. A. Voloshin48, M. Wada10, W. T. Waggoner10, F. Wang33, G. Wang7, J. S. Wang21, X. L. Wang38, Y. Wang43, J. C. Webb44, G. D. Westfall25, C. Whitten Jr.7, H. Wieman22, S. W. Wissink17, R. Witt50, J. Wu38, Y. Wu49, N. Xu22, Q. H. Xu22, Z. Xu3, P. Yepes36, I.-K. Yoo34, Q. Yue43, V. I. Yurevich12, M. Zawisza46, W. Zhan21, H. Zhang3, W. M. Zhang20, Y. Zhang38, Z. P. Zhang38, Y. Zhao38, C. Zhong39, J. Zhou36, R. Zoulkarneev13, Y. Zoulkarneeva13, A. N. Zubarev12, and J. X. Zuo39 (STAR Collaboration)
1Argonne National Laboratory, Argonne, Illinois 60439, USA
2University of Birmingham, Birmingham, United Kingdom
3Brookhaven National Laboratory, Upton, New York 11973, USA
4California Institute of Technology, Pasadena, California 91125, USA
5University of California, Berkeley, California 94720, USA
6University of California, Davis, California 95616, USA
7University of California, Los Angeles, California 90095, USA
8Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
9University of Illinois at Chicago, Chicago, Illinois 60607, USA
10Creighton University, Omaha, Nebraska 68178, USA
11Nuclear Physics Institute AS CR, 250 68 Řež/Prague, Czech Republic
12Laboratory for High Energy (JINR), Dubna, Russia
13Particle Physics Laboratory (JINR), Dubna, Russia
14University of Frankfurt, Frankfurt, Germany
15Institute of Physics, Bhubaneswar 751005, India
16Indian Institute of Technology, Mumbai, India
17Indiana University, Bloomington, Indiana 47408, USA
18Institut de Recherches Subatomiques, Strasbourg, France
19University of Jammu, Jammu 180001, India
20Kent State University, Kent, Ohio 44242, USA
21Institute of Modern Physics, Lanzhou, People's Republic of China
22Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
23Massachusetts Institute of Technology, Cambridge, MA 02139-4307, USA
24Max-Planck-Institut für Physik, Munich, Germany
25Michigan State University, East Lansing, Michigan 48824, USA
26Moscow Engineering Physics Institute, Moscow, Russia
27City College of New York, New York City, New York 10031, USA
28NIKHEF and Utrecht University, Amsterdam, The Netherlands
29Ohio State University, Columbus, Ohio 43210, USA
30Panjab University, Chandigarh 160014, India
31Pennsylvania State University, University Park, Pennsylvania 16802, USA
32Institute of High Energy Physics, Protvino, Russia
33Purdue University, West Lafayette, Indiana 47907, USA
34Pusan National University, Pusan, Republic of Korea
35University of Rajasthan, Jaipur 302004, India
36Rice University, Houston, Texas 77251, USA
37Universidade de Sao Paulo, Sao Paulo, Brazil
38University of Science & Technology of China, Hefei 230026, People's Republic of China
39Shanghai Institute of Applied Physics, Shanghai 201800, People's Republic of China
40SUBATECH, Nantes, France
41Texas A&M University, College Station, Texas 77843, USA
42University of Texas, Austin, Texas 78712, USA
43Tsinghua University, Beijing 100084, People's Republic of China
44Valparaiso University, Valparaiso, Indiana 46383, USA
45Variable Energy Cyclotron Centre, Kolkata 700064, India
46Warsaw University of Technology, Warsaw, Poland
47University of Washington, Seattle, Washington 98195, USA
48Wayne State University, Detroit, Michigan 48201, USA
49Institute of Particle Physics, CCNU (HZNU), Wuhan 430079, People's Republic of China
50Yale University, New Haven, Connecticut 06520, USA
51University of Zagreb, Zagreb, HR-10002, Croatia
Received 11 May 2007; published 29 August 2007
The system created in noncentral relativistic nucleus-nucleus collisions possesses large orbital angular momentum. Because of spin-orbit coupling, particles produced in such a system could become globally polarized along the direction of the system angular momentum. We present the results of Λ and Λ̅ hyperon global polarization measurements in Au+Au collisions at √sNN=62.4 and 200 GeV performed with the STAR detector at the BNL Relativistic Heavy Ion Collider (RHIC). The observed global polarization of Λ and Λ̅ hyperons in the STAR acceptance is consistent with zero within the precision of the measurements. The obtained upper limit, |PΛ,Λ̅ |⩽0.02, is compared with the theoretical values discussed recently in the literature.
© 2007 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevC.76.024915
DOI:
10.1103/PhysRevC.76.024915
PACS:
24.70.+s, 14.20.Jn, 25.75.Ld
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