학술논문

Measurement of the longitudinal spin asymmetries for weak boson production in proton-proton collisions at $\sqrt{s}$ = 510 GeV
Document Type
Working Paper
Author
STAR CollaborationAdam, J.Adamczyk, L.Adams, J. R.Adkins, J. K.Agakishiev, G.Aggarwal, M. M.Ahammed, Z.Alekseev, I.Anderson, D. M.Aoyama, R.Aparin, A.Arkhipkin, D.Aschenauer, E. C.Ashraf, M. U.Atetalla, F.Attri, A.Averichev, G. S.Bairathi, V.Barish, K.Bassill, A. J.Behera, A.Bellwied, R.Bhasin, A.Bhati, A. K.Bielcik, J.Bielcikova, J.Bland, L. C.Bordyuzhin, I. G.Brandenburg, J. D.Brandin, A. V.Brown, D.Bryslawskyj, J.Bunzarov, I.Butterworth, J.Caines, H.Sánchez, M. Calderón de la BarcaCebra, D.Chakaberia, I.Chaloupka, P.Chan, B. K.Chang, F-H.Chang, Z.Chankova-Bunzarova, N.Chatterjee, A.Chattopadhyay, S.Chen, J. H.Chen, X.Cheng, J.Cherney, M.Christie, W.Contin, G.Crawford, H. J.Csanad, M.Das, S.Dedovich, T. G.Deppner, I. M.Derevschikov, A. A.Didenko, L.Dilks, C.Dong, X.Drachenberg, J. L.Dunlop, J. C.Edmonds, T.Efimov, L. G.Elsey, N.Engelage, J.Eppley, G.Esha, R.Esumi, S.Evdokimov, O.Ewigleben, J.Eyser, O.Fatemi, R.Fazio, S.Federic, P.Fedorisin, J.Feng, Y.Filip, P.Finch, E.Fisyak, Y.Flores, C. E.Fulek, L.Gagliardi, C. A.Galatyuk, T.Geurts, F.Gibson, A.Grosnick, D.Gunarathne, D. S.Gupta, A.Guryn, W.Hamad, A. I.Hamed, A.Harlenderova, A.Harris, J. W.He, L.Heppelmann, S.Herrmann, N.Holub, L.Hong, Y.Horvat, S.Huang, B.Huang, H. Z.Huang, S. L.Huang, T.Huang, X.Humanic, T. J.Huo, P.Igo, G.Jacobs, W. W.Jentsch, A.Jia, J.Jiang, K.Jowzaee, S.Ju, X.Judd, E. G.Kabana, S.Kagamaster, S.Kalinkin, D.Kang, K.Kapukchyan, D.Kauder, K.Ke, H. W.Keane, D.Kechechyan, A.Kelsey, M.Kikoła, D. P.Kim, C.Kinghorn, T. A.Kisel, I.Kisiel, A.Kocan, M.Kochenda, L.Kosarzewski, L. K.Kraishan, A. F.Kramarik, L.Kravtsov, P.Krueger, K.Mudiyanselage, N. KulathungaKumar, L.Elayavalli, R. KunnawalkamKvapil, J.Kwasizur, J. H.Lacey, R.Landgraf, J. M.Lauret, J.Lebedev, A.Lednicky, R.Lee, J. H.Li, C.Li, W.Li, X.Li, Y.Liang, Y.Licenik, R.Lidrych, J.Lin, T.Lipiec, A.Lisa, M. A.Liu, F.Liu, H.Liu, P.Liu, X.Liu, Y.Liu, Z.Ljubicic, T.Llope, W. J.Lomnitz, M.Longacre, R. S.Luo, S.Luo, X.Ma, G. L.Ma, L.Ma, R.Ma, Y. G.Magdy, N.Majka, R.Mallick, D.Margetis, S.Markert, C.Matis, H. S.Matonoha, O.Mazer, J. A.Meehan, K.Mei, J. C.Minaev, N. G.Mioduszewski, S.Mishra, D.Mohanty, B.Mondal, M. M.Mooney, I.Moravcova, Z.Morozov, D. A.Nasim, Md.Nayak, K.Nelson, J. M.Nemes, D. B.Nie, M.Nigmatkulov, G.Niida, T.Nogach, L. V.Nonaka, T.Odyniec, G.Ogawa, A.Oh, K.Oh, S.Okorokov, V. A.Olvitt Jr., D.Page, B. S.Pak, R.Panebratsev, Y.Pawlik, B.Pei, H.Perkins, C.Pinter, R. L.Pluta, J.Porter, J.Posik, M.Pruthi, N. K.Przybycien, M.Putschke, J.Quintero, A.Radhakrishnan, S. K.Ramachandran, S.Ray, R. L.Reed, R.Ritter, H. G.Roberts, J. B.Rogachevskiy, O. V.Romero, J. L.Ruan, L.Rusnak, J.Rusnakova, O.Sahoo, N. R.Sahu, P. K.Salur, S.Sandweiss, J.Schambach, J.Schmah, A. M.Schmidke, W. B.Schmitz, N.Schweid, B. R.Seck, F.Seger, J.Sergeeva, M.Seto, R.Seyboth, P.Shah, N.Shahaliev, E.Shanmuganathan, P. V.Shao, M.Shen, W. Q.Shi, S. S.Shou, Q. Y.Sichtermann, E. P.Siejka, S.Sikora, R.Simko, M.Singh, J.Singha, S.Smirnov, D.Smirnov, N.Solyst, W.Sorensen, P.Spinka, H. M.Srivastava, B.Stanislaus, T. D. S.Stewart, D. J.Strikhanov, M.Stringfellow, B.Suaide, A. A. P.Sugiura, T.Sumbera, M.Summa, B.Sun, X. M.Sun, Y.Surrow, B.Svirida, D. N.Szymanski, P.Tang, A. H.Tang, Z.Taranenko, A.Tarnowsky, T.Thomas, J. H.Timmins, A. R.Todoroki, T.Tokarev, M.Tomkiel, C. A.Trentalange, S.Tribble, R. E.Tribedy, P.Tripathy, S. K.Tsai, O. D.Tu, B.Ullrich, T.Underwood, D. G.Upsal, I.Van Buren, G.Vanek, J.Vasiliev, A. N.Vassiliev, I.Videbæk, F.Vokal, S.Voloshin, S. A.Vossen, A.Wang, F.Wang, G.Wang, P.Wang, Y.Webb, J. C.Wen, L.Westfall, G. D.Wieman, H.Wissink, S. W.Witt, R.Wu, Y.Xiao, Z. G.Xie, G.Xie, W.Xu, H.Xu, N.Xu, Q. H.Xu, Y. F.Xu, Z.Yang, C.Yang, Q.Yang, S.Yang, Y.Ye, Z.Yi, L.Yip, K.Yoo, I. -K.Zbroszczyk, H.Zha, W.Zhang, D.Zhang, J.Zhang, L.Zhang, S.Zhang, X. P.Zhang, Y.Zhang, Z.Zhao, J.Zhong, C.Zhou, C.Zhu, X.Zhu, Z.Zurek, M. K.Zyzak, M.
Source
Phys. Rev. D 99, 051102 (2019)
Subject
High Energy Physics - Experiment
Language
Abstract
We report new STAR measurements of the single-spin asymmetries $A_L$ for $W^+$ and $W^-$ bosons produced in polarized proton--proton collisions at $\sqrt{s}$ = 510 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 pb$^{-1}$. The results are combined with previous results obtained with 86 pb$^{-1}$. A comparison with theoretical expectations based on polarized lepton-nucleon deep-inelastic scattering and prior polarized proton--proton data suggests a difference between the $\bar{u}$ and $\bar{d}$ quark helicity distributions for $0.05 < x < 0.25$. In addition, we report new results for the double-spin asymmetries $A_{LL}$ for $W^\pm$, as well as $A_L$ for $Z/\gamma^*$ production and subsequent decay into electron--positron pairs.
Comment: 8 pages, 6 figures