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

. 2014 Aug 15 ; 113 (7) : 072301. [epub] 20140813

Status PubMed-not-MEDLINE Language English Country United States Media print-electronic

Document type Journal Article

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

AGH University of Science and Technology Cracow 30 059 Poland

Alikhanov Institute for Theoretical and Experimental Physics Moscow 117218 Russia

Argonne National Laboratory Argonne Illinois 60439 USA

Brookhaven National Laboratory Upton New York 11973 USA

Central China Normal University Wuhan 430079 China

Cracow University of Technology Cracow 31 155 Poland

Creighton University Omaha Nebraska 68178 USA

Czech Technical University Prague FNSPE Prague 115 19 Czech Republic

Frankfurt Institute for Advanced Studies FIAS Frankfurt 60438 Germany

Indian Institute of Technology Mumbai 400076 India

Indiana University Bloomington Indiana 47408 USA

Institute of High Energy Physics Protvino 142281 Russia

Institute of Modern Physics Lanzhou 730000 China

Institute of Nuclear Physics PAN Cracow 31 342 Poland

Institute of Physics Bhubaneswar 751005 India

Joint Institute for Nuclear Research Dubna 141 980 Russia

Kent State University Kent Ohio 44242 USA

Korea Institute of Science and Technology Information Daejeon 305 701 Korea

Lawrence Berkeley National Laboratory Berkeley California 94720 USA

Massachusetts Institute of Technology Cambridge Massachusetts 02139 4307 USA

Max Planck Institut für Physik Munich 80805 Germany

Michigan State University East Lansing Michigan 48824 USA

Moscow Engineering Physics Institute Moscow 115409 Russia

National Institute of Science Education and Research Bhubaneswar 751005 India

Nuclear Physics Institute AS CR 250 68 Řež Prague Czech Republic

Ohio State University Columbus Ohio 43210 USA

Old Dominion University Norfolk Virginia 23529 USA

Panjab University Chandigarh 160014 India

Pennsylvania State University University Park Pennsylvania 16802 USA

Purdue University West Lafayette Indiana 47907 USA

Pusan National University Pusan 609735 Republic of Korea

Rice University Houston Texas 77251 USA

Shandong University Jinan Shandong 250100 China

Shanghai Institute of Applied Physics Shanghai 201800 China

SUBATECH Nantes 44307 France

Temple University Philadelphia Pennsylvania 19122 USA

Texas A and M University College Station Texas 77843 USA

Tsinghua University Beijing 100084 China

United States Naval Academy Annapolis Maryland 21402 USA

Universidade Estadual de Campinas Sao Paulo 13131 Brazil

University of Birmingham Birmingham B15 2TT United Kingdom

University of California Berkeley California 94720 USA

University of California Davis California 95616 USA

University of California Los Angeles California 90095 USA

University of Houston Houston Texas 77204 USA

University of Illinois at Chicago Chicago Illinois 60607 USA

University of Jammu Jammu 180001 India

University of Kentucky Lexington Kentucky 40506 0055 USA

University of Rajasthan Jaipur 302004 India

University of Science and Technology of China Hefei 230026 China

University of Texas Austin Texas 78712 USA

University of Washington Seattle Washington 98195 USA

University of Zagreb Zagreb HR 10002 Croatia

Valparaiso University Valparaiso Indiana 46383 USA

Variable Energy Cyclotron Centre Kolkata 700064 India

Warsaw University of Technology Warsaw 00 661 Poland

Wayne State University Detroit Michigan 48201 USA

Yale University New Haven Connecticut 06520 USA

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