Phys. Rev. D
80,
111102(R)
(2009)
[7 pages]
Longitudinal spin transfer to Λ and Λ̅ hyperons in polarized proton-proton collisions at √s=200 GeV
B. I. Abelev et al.
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B. I. Abelev8, M. M. Aggarwal30, Z. Ahammed47, A. V. Alakhverdyants17, B. D. Anderson18, D. Arkhipkin3, G. S. Averichev17, J. Balewski22, O. Barannikova8, L. S. Barnby2, S. Baumgart52, D. R. Beavis3, R. Bellwied50, F. Benedosso27, M. J. Betancourt22, R. R. Betts8, A. Bhasin16, A. K. Bhati30, H. Bichsel49, J. Bielcik10, J. Bielcikova11, B. Biritz6, L. C. Bland3, I. Bnzarov17, B. E. Bonner36, J. Bouchet18, E. Braidot27, A. V. Brandin25, A. Bridgeman1, E. Bruna52, S. Bueltmann29, T. P. Burton2, X. Z. Cai40, H. Caines52, M. Calderón de la Barca Sánchez5, O. Catu52, D. Cebra5, R. Cendejas6, M. C. Cervantes42, Z. Chajecki28, P. Chaloupka11, S. Chattopadhyay47, H. F. Chen38, J. H. Chen40, J. Y. Chen51, J. Cheng44, M. Cherney9, A. Chikanian52, K. E. Choi34, W. Christie3, P. Chung11, R. F. Clarke42, M. J. M. Codrington42, R. Corliss22, J. G. Cramer49, H. J. Crawford4, D. Das5, S. Dash13, L. C. De Silva50, R. R. Debbe3, T. G. Dedovich17, M. DePhillips3, A. A. Derevschikov32, R. Derradi de Souza7, L. Didenko3, P. Djawotho42, S. M. Dogra16, X. Dong21, J. L. Drachenberg42, J. E. Draper5, J. C. Dunlop3, M. R. Dutta Mazumdar47, L. G. Efimov17, E. Elhalhuli2, M. Elnimr50, J. Engelage4, G. Eppley36, B. Erazmus41, M. Estienne41, L. Eun31, P. Fachini3, R. Fatemi19, J. Fedorisin17, R. G. Fersch19, P. Filip17, E. Finch52, V. Fine3, Y. Fisyak3, C. A. Gagliardi42, D. R. Gangadharan6, M. S. Ganti47, E. J. Garcia-Solis8, A. Geromitsos41, F. Geurts36, V. Ghazikhanian6, P. Ghosh47, Y. N. Gorbunov9, A. Gordon3, O. Grebenyuk21, D. Grosnick46, B. Grube34, S. M. Guertin6, A. Gupta16, N. Gupta16, W. Guryn3, B. Haag5, T. J. Hallman3, A. Hamed42, L-X. Han40, J. W. Harris52, J. P. Hays-Wehle22, M. Heinz52, S. Heppelmann31, A. Hirsch33, E. Hjort21, A. M. Hoffman22, G. W. Hoffmann43, D. J. Hofman8, R. S. Hollis8, H. Z. Huang6, T. J. Humanic28, L. Huo42, G. Igo6, A. Iordanova8, P. Jacobs21, W. W. Jacobs15, P. Jakl11, C. Jena13, F. Jin40, C. L. Jones22, P. G. Jones2, J. Joseph18, E. G. Judd4, S. Kabana41, K. Kajimoto43, K. Kang44, J. Kapitan11, K. Kauder8, D. Keane18, A. Kechechyan17, D. Kettler49, V. Yu. Khodyrev32, D. P. Kikola21, J. Kiryluk21, A. Kisiel48, S. R. Klein21, A. G. Knospe52, A. Kocoloski22, D. D. Koetke46, T. Kollegger12, J. Konzer33, M. Kopytine18, I. Koralt29, W. Korsch19, L. Kotchenda25, V. Kouchpil11, P. Kravtsov25, V. I. Kravtsov32, K. Krueger1, M. Krus10, L. Kumar30, P. Kurnadi6, M. A. C. Lamont3, J. M. Landgraf3, S. LaPointe50, J. Lauret3, A. Lebedev3, R. Lednicky17, C-H. Lee34, J. H. Lee3, W. Leight22, M. J. LeVine3, C. Li38, N. Li51, X. Li33, Y. Li44, Z. Li51, G. Lin52, S. J. Lindenbaum26, M. A. Lisa28, F. Liu51, H. Liu5, J. Liu36, T. Ljubicic3, W. J. Llope36, R. S. Longacre3, W. A. Love3, Y. Lu38, T. Ludlam3, G. L. Ma40, Y. G. Ma40, D. P. Mahapatra13, R. Majka52, O. I. Mall5, L. K. Mangotra16, R. Manweiler46, S. Margetis18, C. Markert43, H. Masui21, H. S. Matis21, Yu. A. Matulenko32, D. McDonald36, T. S. McShane9, A. Meschanin32, R. Milner22, N. G. Minaev32, S. Mioduszewski42, A. Mischke27, M. K. Mitrovski12, B. Mohanty47, D. A. Morozov32, M. G. Munhoz37, B. K. Nandi14, C. Nattrass52, T. K. Nayak47, J. M. Nelson2, P. K. Netrakanti33, M. J. Ng4, L. V. Nogach32, S. B. Nurushev32, G. Odyniec21, A. Ogawa3, H. Okada3, V. Okorokov25, D. Olson21, M. Pachr10, B. S. Page15, S. K. Pal47, Y. Pandit18, Y. Panebratsev17, T. Pawlak48, T. Peitzmann27, V. Perevoztchikov3, C. Perkins4, W. Peryt48, S. C. Phatak13, P. Pile3, M. Planinic53, M. A. Ploskon21, J. Pluta48, D. Plyku29, N. Poljak53, A. M. Poskanzer21, B. V. K. S. Potukuchi16, D. Prindle49, C. Pruneau50, N. K. Pruthi30, P. R. Pujahari14, J. Putschke52, R. Raniwala35, S. Raniwala35, R. L. Ray43, R. Redwine22, R. Reed5, J. M. Rehberg12, H. G. Ritter21, J. B. Roberts36, O. V. Rogachevskiy17, J. L. Romero5, A. Rose21, C. Roy41, L. Ruan3, M. J. Russcher27, R. Sahoo41, S. Sakai6, I. Sakrejda21, T. Sakuma22, S. Salur21, J. Sandweiss52, J. Schambach43, R. P. Scharenberg33, N. Schmitz23, T. R. Schuster12, J. Seele22, J. Seger9, I. Selyuzhenkov15, P. Seyboth23, E. Shahaliev17, M. Shao38, M. Sharma50, S. S. Shi51, E. P. Sichtermann21, F. Simon23, R. N. Singaraju47, M. J. Skoby33, N. Smirnov52, P. Sorensen3, J. Sowinski15, H. M. Spinka1, B. Srivastava33, T. D. S. Stanislaus46, D. Staszak6, J. R. Stevens15, R. Stock12, M. Strikhanov25, B. Stringfellow33, A. A. P. Suaide37, M. C. Suarez8, N. L. Subba18, M. Sumbera11, X. M. Sun21, Y. Sun38, Z. Sun20, B. Surrow22, T. J. M. Symons21, A. Szanto de Toledo37, J. Takahashi7, A. H. Tang3, Z. Tang38, L. H. Tarini50, T. Tarnowsky24, D. Thein43, J. H. Thomas21, J. Tian40, A. R. Timmins50, S. Timoshenko25, D. Tlusty11, M. Tokarev17, T. A. Trainor49, V. N. Tram21, S. Trentalange6, R. E. Tribble42, O. D. Tsai6, J. Ulery33, T. Ullrich3, D. G. Underwood1, G. Van Buren3, G. van Nieuwenhuizen22, J. A. Vanfossen, Jr.18, R. Varma14, G. M. S. Vasconcelos7, A. N. Vasiliev32, F. Videbaek3, Y. P. Viyogi47, S. Vokal17, S. A. Voloshin50, M. Wada43, M. Walker22, F. Wang33, G. Wang6, H. Wang24, J. S. Wang20, Q. Wang33, X. Wang44, X. L. Wang38, Y. Wang44, G. Webb19, J. C. Webb46, G. D. Westfall24, C. Whitten, Jr.6, H. Wieman21, S. W. Wissink15, R. Witt45, Y. Wu51, W. Xie33, N. Xu21, Q. H. Xu39, W. Xu6, Y. Xu38, Z. Xu3, L. Xue40, Y. Yang20, P. Yepes36, K. Yip3, I-K. Yoo34, Q. Yue44, M. Zawisza48, H. Zbroszczyk48, W. Zhan20, S. Zhang40, W. M. Zhang18, X. P. Zhang21, Y. Zhang21, Z. P. Zhang38, Y. Zhao38, C. Zhong40, J. Zhou36, W. Zhou39, X. Zhu44, Y-H. Zhu40, R. Zoulkarneev17, and Y. Zoulkarneeva17 (STAR Collaboration)
1Argonne National Laboratory, Argonne, Illinois 60439, USA
2University of Birmingham, Birmingham, United Kingdom
3Brookhaven National Laboratory, Upton, New York 11973, USA
4University of California, Berkeley, California 94720, USA
5University of California, Davis, California 95616, USA
6University of California, Los Angeles, California 90095, USA
7Universidade Estadual de Campinas, Sao Paulo, Brazil
8University of Illinois at Chicago, Chicago, Illinois 60607, USA
9Creighton University, Omaha, Nebraska 68178, USA
10Czech Technical University in Prague, FNSPE, Prague, 115 19, Czech Republic
11Nuclear Physics Institute AS CR, 250 68 Řež/Prague, Czech Republic
12University of Frankfurt, Frankfurt, Germany
13Institute of Physics, Bhubaneswar 751005, India
14Indian Institute of Technology, Mumbai, India
15Indiana University, Bloomington, Indiana 47408, USA
16University of Jammu, Jammu 180001, India
17Joint Institute for Nuclear Research, Dubna, 141 980, Russia
18Kent State University, Kent, Ohio 44242, USA
19University of Kentucky, Lexington, Kentucky 40506-0055, USA
20Institute of Modern Physics, Lanzhou, China
21Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
22Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA
23Max-Planck-Institut für Physik, Munich, Germany
24Michigan State University, East Lansing, Michigan 48824, USA
25Moscow Engineering Physics Institute, Moscow, Russia
26City College of New York, New York City, New York 10031, USA
27NIKHEF and Utrecht University, Amsterdam, The Netherlands
28The Ohio State University, Columbus, Ohio 43210, USA
29Old Dominion University, Norfolk, Virginia 23529, 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, China
39Shandong University, Jinan, Shandong 250100, China
40Shanghai Institute of Applied Physics, Shanghai 201800, China
41SUBATECH, Nantes, France
42Texas A&M University, College Station, Texas 77843, USA
43University of Texas, Austin, Texas 78712, USA
44Tsinghua University, Beijing 100084, China
45United States Naval Academy, Annapolis, Maryland 21402, USA
46Valparaiso University, Valparaiso, Indiana 46383, USA
47Variable Energy Cyclotron Centre, Kolkata 700064, India
48Warsaw University of Technology, Warsaw, Poland
49University of Washington, Seattle, Washington 98195, USA
50Wayne State University, Detroit, Michigan 48201, USA
51Institute of Particle Physics, CCNU (HZNU), Wuhan 430079, China
52Yale University, New Haven, Connecticut 06520, USA
53University of Zagreb, Zagreb, HR-10002, Croatia
Received 8 October 2009; published 8 December 2009
The longitudinal spin transfer, DLL, from high energy polarized protons to Λ and Λ̅ hyperons has been measured for the first time in proton-proton collisions at √s=200 GeV with the STAR detector at the Relativistic Heavy Ion Collider. The measurements cover pseudorapidity, η, in the range |η|<1.2 and transverse momenta, pT, up to 4 GeV/c. The longitudinal spin transfer is found to be DLL=-0.03±0.13(stat)±0.04(syst) for inclusive Λ and DLL=-0.12±0.08(stat)±0.03(syst) for inclusive Λ̅ hyperons with ⟨η⟩=0.5 and ⟨pT⟩=3.7 GeV/c. The dependence on η and pT is presented.
© 2009 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevD.80.111102
DOI:
10.1103/PhysRevD.80.111102
PACS:
13.85.Hd, 13.85.Ni, 13.87.Fh, 13.88.+e
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