Measurement of the longitudinal spin asymmetries for weak boson production in proton-proton collisions at s=510 GeV
J. Adam(L. AdamczykAGH University of Science and Technology , FPACS , Cracow 30-059 , PolandJ. R. AdamsOhio State University , Columbus , Ohio 43210J. K. AdkinsUniversity of Kentucky , Lexington , Kentucky 40506-0055 27G. AgakishievJoint Institute for Nuclear Research , Dubna 141 980 , RussiaM. M. AggarwalPanjab University , Chandigarh 160014 , IndiaZ. AhammedVariable Energy Cyclotron Centre , Kolkata 700064 , IndiaI. AlekseevNational Research Nuclear University MEPhI , Moscow 115409 , RussiaD. M. AndersonTexas A&M University , College Station , Texas 77843Y. G.University of Tsukuba , Tsukuba , Ibaraki 305-8571 , JapanA. AparinJoint Institute for Nuclear Research , Dubna 141 980 , RussiaD. ArkhipkinBrookhaven National Laboratory , Upton , New York 11973E. C. AschenauerBrookhaven National Laboratory , Upton , New York 11973M. U. AshrafTsinghua University , Beijing 100084F. AtetallaKent State University , Kent , Ohio 44242A. AttriPanjab University , Chandigarh 160014 , IndiaG. S. AverichevJoint Institute for Nuclear Research , Dubna 141 980 , RussiaV. BairathiNational Institute of Science Education and Research , HBNI , Jatni 752050 , IndiaK. N. BarishUniversity of California , Riverside , California 92521A. J. BassillUniversity of California , Riverside , California 92521A. BeheraState University of New York , Stony Brook , New York 11794R. BellwiedUniversity of Houston , Houston , Texas 77204A. BhasinUniversity of Jammu, Jammu 180001, IndiaA. K. BhatiPanjab University , Chandigarh 160014 , IndiaJ. BielčíkCzech Technical University in Prague , FNSPE , Prague 115 19 , Czech RepublicJ. BielcikovaNuclear Physics Institute of the CAS , Rez 250 68 , Czech RepublicL. C. BlandBrookhaven National Laboratory , Upton , New York 11973I. G. BordyuzhinAlikhanov Institute for Theoretical and Experimental Physics , Moscow 117218 , RussiaJ. D. BrandenburgBrookhaven National Laboratory , Upton , New York 11973A. V. BrandinNational Research Nuclear University MEPhI , Moscow 115409 , RussiaD. S. BrownLehigh University , Bethlehem , Pennsylvania 18015J. BryslawskyjUniversity of California , Riverside , California 92521I. BunzarovJoint Institute for Nuclear Research , Dubna 141 980 , RussiaJ. M. ButterworthRice University , Houston , Texas 77251H. CainesYale University , New Haven , Connecticut 06520M. Calderón de la Barca SánchezUniversity of California , Davis , California 95616D. CebraUniversity of California, Davis, California 95616I. ChakaberiaKent State University , Kent , Ohio 44242P. ChaloupkaCzech Technical University in Prague , FNSPE , Prague 115 19 , Czech RepublicB. K. ChanUniversity of California , Los Angeles , California 90095F-H. ChangNational Cheng Kung University , Tainan 70101Z. ChangBrookhaven National Laboratory , Upton , New York 11973N. Chankova-BunzarovaJoint Institute for Nuclear Research , Dubna 141 980 , RussiaA. ChatterjeeLawrence Berkeley National Laboratory , Berkeley , California 94720S. ChattopadhyayVariable Energy Cyclotron Centre , Kolkata 700064 , IndiaC. H. ChengShanghai Institute of Applied Physics , Chinese Academy of Sciences , Shanghai 201800X. ChenUniversity of Science and Technology of China , Hefei , Anhui 230026J. ChengTsinghua University , Beijing 100084M. CherneyCreighton University , Omaha , Nebraska 68178W. ChristieBrookhaven National Laboratory , Upton , New York 11973G. ContinLawrence Berkeley National Laboratory , Berkeley , California 94720H. J. CrawfordUniversity of California , Berkeley , California 94720M. CsanádEötvös Loránd University , Budapest , Hungary H-1117Susobhan DasCentral China Normal University , Wuhan , Hubei 430079Т. Г. ДедовичJoint Institute for Nuclear Research , Dubna 141 980 , RussiaI. M. DeppnerUniversity of Heidelberg, Heidelberg 69120, GermanyA. A. DerevschikovNational Research Centre "Kurchatov Institute"-Institute of High Energy Physics , Protvino 142281 , RussiaL. DidenkoBrookhaven National Laboratory , Upton , New York 11973C. DilksPennsylvania State University , University Park , Pennsylvania 16802X. DongLawrence Berkeley National Laboratory , Berkeley , California 94720J. L. DrachenbergAbilene Christian University , Abilene , Texas 79699J. C. DunlopBrookhaven National Laboratory , Upton , New York 11973T. EdmondsPurdue University , West Lafayette , Indiana 47907L. G. EfimovJoint Institute for Nuclear Research , Dubna 141 980 , RussiaN. ElseyWayne State University , Detroit , Michigan 48201J. EngelageUniversity of California , Berkeley , California 94720G. EppleyRice University , Houston , Texas 77251R. EshaUniversity of California , Los Angeles , California 90095S. EsumiUniversity of Tsukuba , Tsukuba , Ibaraki 305-8571 , JapanO. EvdokimovUniversity of Illinois at Chicago , Chicago , Illinois 60607J. EwiglebenLehigh University , Bethlehem , Pennsylvania 18015O. EyserBrookhaven National Laboratory , Upton , New York 11973R. FatemiUniversity of Kentucky , Lexington , Kentucky 40506-0055 27S. FazioBrookhaven National Laboratory , Upton , New York 11973P. FedericNuclear Physics Institute of the CAS , Rez 250 68 , Czech RepublicJ. FedorisinJoint Institute for Nuclear Research , Dubna 141 980 , RussiaY. FengLawrence Berkeley National Laboratory , Berkeley , California 94720P. FilipJoint Institute for Nuclear Research , Dubna 141 980 , RussiaE. FinchSouthern Connecticut State University , New Haven , Connecticut 06515Y. FisyakBrookhaven National Laboratory , Upton , New York 11973C. E. FloresUniversity of California , Davis , California 95616Ł. FulekAGH University of Science and Technology , FPACS , Cracow 30-059 , PolandC. A. GagliardiTexas A&M University , College Station , Texas 77843T. GalatyukTechnische Universität Darmstadt , Darmstadt 64289 , GermanyF. J. M. GeurtsRice University , Houston , Texas 77251S. M. GibsonValparaiso University , Valparaiso , Indiana 46383D. GrosnickValparaiso University , Valparaiso , Indiana 46383D. S. GunarathneTemple University , Philadelphia , Pennsylvania 19122A. GuptaUniversity of Jammu , Jammu 180001 , IndiaW. GurynBrookhaven National Laboratory , Upton , New York 11973A. I. HamadKent State University , Kent , Ohio 44242A. HamedTexas A&M University , College Station , Texas 77843A. HarlenderovaCzech Technical University in Prague , FNSPE , Prague 115 19 , Czech RepublicJ. W. HarrisYale University, New Haven, Connecticut 06520L. HePurdue University , West Lafayette , Indiana 47907S. HeppelmannUniversity of California , Davis , California 95616S. HeppelmannUniversity of California , Davis , California 95616N. HerrmannUniversity of Heidelberg, Heidelberg 69120, GermanyL. HolubCzech Technical University in Prague , FNSPE , Prague 115 19 , Czech RepublicY. HongLawrence Berkeley National Laboratory , Berkeley , California 94720
2019lv
ABI
Аннотация
We report new STAR measurements of the single-spin asymmetries ${A}_{L}$ for ${W}^{+}$ and ${W}^{\ensuremath{-}}$ bosons produced in polarized proton-proton collisions at $\sqrt{s}=510\text{ }\text{ }\mathrm{GeV}$ as a function of the decay-positron and decay-electron pseudorapidity. The data were obtained in 2013 and correspond to an integrated luminosity of $250\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$. The results are combined with previous results obtained with $86\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$. A comparison with theoretical expectations based on polarized lepton-nucleon deep-inelastic scattering and prior polarized proton-proton data suggests a difference between the $\overline{u}$ and $\overline{d}$ quark helicity distributions for $0.05<x<0.25$. In addition, we report new results for the double-spin asymmetries ${A}_{LL}$ for ${W}^{\ifmmode\pm\else\textpm\fi{}}$, as well as ${A}_{L}$ for $Z/{\ensuremath{\gamma}}^{*}$ production and subsequent decay into electron-positron pairs.
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