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Phys Rev Lett. 2014 Aug 15;113(7):072301. Epub 2014 Aug 13.

Measurement of longitudinal spin asymmetries for weak boson production in polarized proton-proton collisions at RHIC.

Adamczyk L1, Adkins JK2, Agakishiev G3, Aggarwal MM4, Ahammed Z5, Alekseev I6, Alford J7, Anson CD8, Aparin A3, Arkhipkin D9, Aschenauer EC9, Averichev GS3, Balewski J10, Banerjee A5, Beavis DR9, Bellwied R11, Bhasin A12, Bhati AK4, Bhattarai P13, Bichsel H14, Bielcik J15, Bielcikova J16, Bland LC9, Bordyuzhin IG6, Borowski W17, Bouchet J7, Brandin AV18, Brovko SG19, Bültmann S20, Bunzarov I3, Burton TP9, Butterworth J21, Caines H22, Calderón de la Barca Sánchez M19, Campbell JM8, Cebra D19, Cendejas R23, Cervantes MC24, Chaloupka P15, Chang Z24, Chattopadhyay S5, Chen HF25, Chen JH26, Chen L27, Cheng J28, Cherney M29, Chikanian A22, Christie W9, Chwastowski J30, Codrington MJ13, Contin G31, Cramer JG14, Crawford HJ32, Cui X25, Das S33, Davila Leyva A13, De Silva LC29, Debbe RR9, Dedovich TG3, Deng J34, Derevschikov AA35, Derradi de Souza R36, Dhamija S37, di Ruzza B9, Didenko L9, Dilks C23, Ding F19, Djawotho P24, Dong X31, Drachenberg JL38, Draper JE19, Du CM39, Dunkelberger LE40, Dunlop JC9, Efimov LG3, Engelage J32, Engle KS41, Eppley G21, Eun L31, Evdokimov O42, Eyser O9, Fatemi R2, Fazio S9, Fedorisin J3, Filip P3, Finch E22, Fisyak Y9, Flores CE19, Gagliardi CA24, Gangadharan DR8, Garand D43, Geurts F21, Gibson A38, Girard M44, Gliske S45, Greiner L31, Grosnick D38, Gunarathne DS46, Guo Y25, Gupta A12, Gupta S12, Guryn W9, Haag B19, Hamed A24, Han LX26, Haque R47, Harris JW22, Heppelmann S23, Hirsch A43, Hoffmann GW13, Hofman DJ42, Horvat S22, Huang B9, Huang HZ40, Huang X28, Huck P27, Humanic TJ8, Igo G40, Jacobs WW37, Jang H48, Judd EG32, Kabana S17, Kalinkin D6, Kang K28, Kauder K42, Ke HW9, Keane D7, Kechechyan A3, Kesich A19, Khan ZH42, Kikola DP44, Kisel I49, Kisiel A44, Koetke DD38, Kollegger T49, Konzer J43, Koralt I20, Kosarzewski LK44, Kotchenda L18, Kraishan AF46, Kravtsov P18, Krueger K45, Kulakov I49, Kumar L47, Kycia RA30, Lamont MA9, Landgraf JM9, Landry KD40, Lauret J9, Lebedev A9, Lednicky R3, Lee JH9, LeVine MJ9, Li C25, Li W26, Li X43, Li X46, Li Y28, Li ZM27, Lisa MA8, Liu F27, Ljubicic T9, Llope WJ21, Lomnitz M7, Longacre RS9, Luo X27, Ma GL26, Ma YG26, Madagodagettige Don DM29, Mahapatra DP33, Majka R22, Margetis S7, Markert C13, Masui H31, Matis HS31, McDonald D11, McShane TS29, Minaev NG35, Mioduszewski S24, Mohanty B47, Mondal MM24, Morozov DA35, Mustafa MK31, Nandi BK50, Nasim M47, Nayak TK5, Nelson JM51, Nigmatkulov G18, Nogach LV35, Noh SY48, Novak J52, Nurushev SB35, Odyniec G31, Ogawa A9, Oh K53, Ohlson A22, Okorokov V18, Oldag EW13, Olvitt DL Jr46, Pachr M15, Page BS37, Pal SK5, Pan YX40, Pandit Y42, Panebratsev Y3, Pawlak T44, Pawlik B54, Pei H27, Perkins C32, Peryt W44, Pile P9, Planinic M55, Pluta J44, Poljak N55, Poniatowska K44, Porter J31, Poskanzer AM31, Pruthi NK4, Przybycien M1, Pujahari PR50, Putschke J56, Qiu H31, Quintero A7, Ramachandran S2, Raniwala R57, Raniwala S57, Ray RL13, Riley CK22, Ritter HG31, Roberts JB21, Rogachevskiy OV3, Romero JL19, Ross JF29, Roy A5, Ruan L9, Rusnak J16, Rusnakova O15, Sahoo NR24, Sahu PK33, Sakrejda I31, Salur S31, Sandweiss J22, Sangaline E19, Sarkar A50, Schambach J13, Scharenberg RP43, Schmah AM31, Schmidke WB9, Schmitz N58, Seger J29, Seyboth P58, Shah N40, Shahaliev E3, Shanmuganathan PV7, Shao M25, Sharma B4, Shen WQ26, Shi SS31, Shou QY26, Sichtermann EP31, Singaraju RN5, Skoby MJ37, Smirnov D9, Smirnov N22, Solanki D57, Sorensen P9, Spinka HM45, Srivastava B43, Stanislaus TD38, Stevens JR10, Stock R49, Strikhanov M18, Stringfellow B43, Sumbera M16, Sun X31, Sun XM31, Sun Y25, Sun Z39, Surrow B46, Svirida DN6, Symons TJ31, Szelezniak MA31, Takahashi J36, Tang AH9, Tang Z25, Tarnowsky T52, Thomas JH31, Timmins AR11, Tlusty D16, Tokarev M3, Trentalange S40, Tribble RE24, Tribedy P5, Trzeciak BA15, Tsai OD40, Turnau J54, Ullrich T9, Underwood DG45, Van Buren G9, van Nieuwenhuizen G10, Vandenbroucke M46, Vanfossen JA Jr7, Varma R50, Vasconcelos GM36, Vasiliev AN35, Vertesi R16, Videbæk F9, Viyogi YP5, Vokal S3, Vossen A37, Wada M13, Wang F43, Wang G40, Wang H9, Wang JS39, Wang XL25, Wang Y28, Wang Y42, Webb G2, Webb JC9, Westfall GD52, Wieman H31, Wissink SW37, Witt R41, Wu YF27, Xiao Z28, Xie W43, Xin K21, Xu H39, Xu J27, Xu N31, Xu QH34, Xu Y25, Xu Z9, Yan W28, Yang C25, Yang Y39, Yang Y27, Ye Z42, Yepes P21, Yi L43, Yip K9, Yoo IK53, Yu N27, Zawisza Y25, Zbroszczyk H44, Zha W25, Zhang JB27, Zhang JL34, Zhang S26, Zhang XP28, Zhang Y25, Zhang ZP25, Zhao F40, Zhao J27, Zhong C26, Zhu X28, Zhu YH26, Zoulkarneeva Y3, Zyzak M49; (STAR Collaboration).

Author information

1
AGH University of Science and Technology, Cracow 30-059, Poland.
2
University of Kentucky, Lexington, Kentucky 40506-0055, USA.
3
Joint Institute for Nuclear Research, Dubna 141 980, Russia.
4
Panjab University, Chandigarh 160014, India.
5
Variable Energy Cyclotron Centre, Kolkata 700064, India.
6
Alikhanov Institute for Theoretical and Experimental Physics, Moscow 117218, Russia.
7
Kent State University, Kent, Ohio 44242, USA.
8
Ohio State University, Columbus, Ohio 43210, USA.
9
Brookhaven National Laboratory, Upton, New York 11973, USA.
10
Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA.
11
University of Houston, Houston, Texas 77204, USA.
12
University of Jammu, Jammu 180001, India.
13
University of Texas, Austin, Texas 78712, USA.
14
University of Washington, Seattle, Washington 98195, USA.
15
Czech Technical University in Prague, FNSPE, Prague 115 19, Czech Republic.
16
Nuclear Physics Institute AS CR, 250 68 Řež/Prague, Czech Republic.
17
SUBATECH, Nantes 44307, France.
18
Moscow Engineering Physics Institute, Moscow 115409, Russia.
19
University of California, Davis, California 95616, USA.
20
Old Dominion University, Norfolk, Virginia 23529, USA.
21
Rice University, Houston, Texas 77251, USA.
22
Yale University, New Haven, Connecticut 06520, USA.
23
Pennsylvania State University, University Park, Pennsylvania 16802, USA.
24
Texas A&M University, College Station, Texas 77843, USA.
25
University of Science and Technology of China, Hefei 230026, China.
26
Shanghai Institute of Applied Physics, Shanghai 201800, China.
27
Central China Normal University (HZNU), Wuhan 430079, China.
28
Tsinghua University, Beijing 100084, China.
29
Creighton University, Omaha, Nebraska 68178, USA.
30
Cracow University of Technology, Cracow 31-155, Poland.
31
Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
32
University of California, Berkeley, California 94720, USA.
33
Institute of Physics, Bhubaneswar 751005, India.
34
Shandong University, Jinan, Shandong 250100, China.
35
Institute of High Energy Physics, Protvino 142281, Russia.
36
Universidade Estadual de Campinas, Sao Paulo 13131, Brazil.
37
Indiana University, Bloomington, Indiana 47408, USA.
38
Valparaiso University, Valparaiso, Indiana 46383, USA.
39
Institute of Modern Physics, Lanzhou 730000, China.
40
University of California, Los Angeles, California 90095, USA.
41
United States Naval Academy, Annapolis, Maryland 21402, USA.
42
University of Illinois at Chicago, Chicago, Illinois 60607, USA.
43
Purdue University, West Lafayette, Indiana 47907, USA.
44
Warsaw University of Technology, Warsaw 00-661, Poland.
45
Argonne National Laboratory, Argonne, Illinois 60439, USA.
46
Temple University, Philadelphia, Pennsylvania 19122, USA.
47
National Institute of Science Education and Research, Bhubaneswar 751005, India.
48
Korea Institute of Science and Technology Information, Daejeon 305-701, Korea.
49
Frankfurt Institute for Advanced Studies FIAS, Frankfurt 60438, Germany.
50
Indian Institute of Technology, Mumbai 400076, India.
51
University of Birmingham, Birmingham B15 2TT, United Kingdom.
52
Michigan State University, East Lansing, Michigan 48824, USA.
53
Pusan National University, Pusan 609735, Republic of Korea.
54
Institute of Nuclear Physics PAN, Cracow 31-342, Poland.
55
University of Zagreb, Zagreb HR-10002, Croatia.
56
Wayne State University, Detroit, Michigan 48201, USA.
57
University of Rajasthan, Jaipur 302004, India.
58
Max-Planck-Institut für Physik, Munich 80805, Germany.

Abstract

We report measurements of single- and double-spin asymmetries for W^{±} and Z/γ^{*} boson production in longitudinally polarized p+p collisions at sqrt[s]=510  GeV by the STAR experiment at RHIC. The asymmetries for W^{±} were measured as a function of the decay lepton pseudorapidity, which provides a theoretically clean probe of the proton's polarized quark distributions at the scale of the W mass. The results are compared to theoretical predictions, constrained by polarized deep inelastic scattering measurements, and show a preference for a sizable, positive up antiquark polarization in the range 0.05<x<0.2.

PMID:
25170701
DOI:
10.1103/PhysRevLett.113.072301
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