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

We report measurements of single- and double- spin asymmetries for \(W^{\pm}\) and \(Z/\gamma^*\) boson production in longitudinally polarized \(p+p\) collisions at \(\sqrt{s} = 510\) GeV by the STAR experiment at RHIC. The asymmetries for \(W^{\pm}\) were measured as a function of the decay lepton...

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Bibliographic Details
Published in:arXiv.org 2014-08
Main Authors: Adamczyk, L, Adkins, J K, Arkhipkin, D, Aschenauer, E C, Averichev, G S, Banerjee, A, Bhasin, A, Brandin, A V, Brovko, S G, Campbell, J M, Cendejas, R, Chaloupka, P, Chang, Z, Chwastowski, J, Contin, G, Cramer, J G, Crawford, H J, Debbe, R R, Dilks, C, Ding, F, Dong, X, Du, C M, Dunlop, J C, Engle, K S, Fisyak, Y, Flores, C E, Gagliardi, C A, Gangadharan, D R, Geurts, F, Gupta, S, Hirsch, A, Huang, H Z, Jang, H, Judd, E G, Kabana, S, Kang, K, Kisel, I, Kisiel, A, Kosarzewski, L K, Krueger, K, Kumar, L, LeVine, M J, W Li, Ljubicic, T, D M M D Madagodagettige Don, Mahapatra, D P, Masui, H, Mondal, M M, Nandi, B K, Nogach, L V, Novak, J, Ogawa, A, Olvitt, D L, Pachr, M, Page, B S, Panebratsev, Y, Pei, H, Pruthi, N K, Ramachandran, S, Raniwala, R, Ritter, H G, Roberts, J B, Roy, A, Rusnak, J, Sahu, P K, Sandweiss, J, Scharenberg, R P, Seger, J, Shanmuganathan, P V, Shao, M, Shen, W Q, Spinka, H M, Sun, Y, Sun, Z, Szelezniak, M A, Takahashi, J, Tang, Z, Tokarev, M, Trentalange, S, Tribble, R E, Trzeciak, B A, Tsai, O D, Turnau, J, Varma, R, Vasconcelos, G M S, Vertesi, R, Vossen, A, Wang, F, Wang, H, Webb, J C, Witt, R, J Xu, Yang, C, Z Ye, Yepes, P, L Yi, I-K, Yoo, N Yu, Zha, W, Zhang, Z P
Format: Article
Language:English
Subjects:
Asymmetry
Inelastic scattering
Leptons
Particle collisions
Protons
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Summary:We report measurements of single- and double- spin asymmetries for \(W^{\pm}\) and \(Z/\gamma^*\) boson production in longitudinally polarized \(p+p\) collisions at \(\sqrt{s} = 510\) GeV by the STAR experiment at RHIC. The asymmetries for \(W^{\pm}\) 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 recent polarized deep inelastic scattering measurements, and show a preference for a sizable, positive up antiquark polarization in the range \(0.05
ISSN:2331-8422
DOI:10.48550/arxiv.1404.6880