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Adam, J, Adamczyk, L, Adams, JR, Adkins, JK, Agakishiev, G, Aggarwal, MM, Ahammed, Z, Ajitanand, NN, Alekseev, I, Anderson, DM et al (show 338 more authors) , Aoyama, R, Aparin, A, Arkhipkin, D, Aschenauer, EC, Ashraf, MU, Atetalla, F, Attri, A, Averichev, GS, Bai, X, Bairathi, V, Barish, K, Bassill, AJ, Behera, A, Bellwied, R, Bhasin, A, Bhati, AK, Bielcik, J, Bielcikova, J, Bland, LC, Bordyuzhin, IG, Brandenburg, JD, Brandin, AV, Brown, D, Bryslawskyj, J, Bunzarov, I, Butterworth, J, Caines, H, Sanchez, M Calderon de la Barca, Campbell, JM, Cebra, D, Chakaberia, I, Chaloupka, P, Chang, F-H, Chang, Z, Chankova-Bunzarova, N, Chatterjee, A, Chattopadhyay, S, Chen, JH, Chen, X, Chen, X, Cheng, J, Cherney, M, Christie, W, Contin, G, Crawford, HJ, Das, S, Dedovich, TG, Deppner, IM, Derevschikov, AA, Didenko, L, Dilks, C, Dong, X, Drachenberg, JL, Dunlop, JC, Efimov, LG, Elsey, N, Engelage, J, Eppley, G, Esha, R, Esumi, S, Evdokimov, O, Ewigleben, J, Eyser, O, Fatemi, R, Fazio, S, Federic, P, Federicova, P, Fedorisin, J, Filip, P, Finch, E, Fisyak, Y, Flores, CE, Fulek, L, Gagliardi, CA, Galatyuk, T, Geurts, F, Gibson, A, Grosnick, D, Gunarathne, DS, Guo, Y, Gupta, A, Guryn, W, Hamad, AI, Hamed, A, Harlenderova, A, Harris, JW, He, L, Heppelmann, S, Heppelmann, S, Herrmann, N, Hirsch, A, Holub, L, Horvat, S, Huang, X, Huang, B, Huang, SL, Huang, HZ, Huang, T, Humanic, TJ, Huo, P, Igo, G, Jacobs, WW, Jentsch, A, Jia, J, Jiang, K, Jowzaee, S, Judd, EG, Kabana, S, Kalinkin, D, Kang, K, Kapukchyan, D, Kauder, K, Ke, HW, Keane, D, Kechechyan, A, Kikola, DP, Kim, C, Kinghorn, TA, Kisel, I, Kisiel, A, Kochenda, L, Kosarzewski, LK, Kraishan, AF, Kramarik, L, Krauth, L, Kravtsov, P, Krueger, K, Kulathunga, N, Kumar, S, Kumar, L, Kvapil, J, Kwasizur, JH, Lacey, R, Landgraf, JM, Lauret, J, Lebedev, A, Lednicky, R, Lee, JH, Li, X, Li, C, Li, W, Li, Y, Liang, Y, Lidrych, J, Lin, T, Lipiec, A, Lisa, MA, Liu, F, Liu, P, Liu, H, Liu, Y, Ljubicic, T, Llope, WJ, Lomnitz, M, Longacre, RS, Luo, X, Luo, S, Ma, GL, Ma, YG, Ma, L, Ma, R, Magdy, N, Majka, R, Mallick, D, Margetis, S, Markert, C, Matis, HS, Matonoha, O, Mayes, D, Mazer, JA, Meehan, K, Mei, JC, Minaev, NG, Mioduszewski, S, Mishra, D, Mohanty, B, Mondal, MM, Mooney, I, Morozov, DA, Nasim, Md, Negrete, JD, Nelson, JM, Nemes, DB, Nie, M, Nigmatkulov, G, Niida, T, Nogach, LV, Nonaka, T, Nurushev, SB, Odyniec, G, Ogawa, A, Oh, K, Oh, S, Okorokov, VA, Olvitt, D Jr, Page, BS, Pak, R, Panebratsev, Y, Pawlik, B, Pei, H, Perkins, C, Pluta, J, Porter, J, Posik, M, Pruthi, NK, Przybycien, M, Putschke, J, Quintero, A, Radhakrishnan, SK, Ramachandran, S, Ray, RL, Reed, R, Ritter, HG, Roberts, JB, Rogachevskiy, OV, Romero, JL, Ruan, L, Rusnak, J, Rusnakova, O, Sahoo, NR, Sahu, PK, Salur, S, Sandweiss, J, Schambach, J, Schmah, AM, Schmidke, WB, Schmitz, N, Schweid, BR, Seck, F, Seger, J, Sergeeva, M, Seto, R, Seyboth, P, Shah, N, Shahaliev, E, Shanmuganathan, PV, Shao, M, Shen, WQ, Shen, F, Shi, SS, Shou, QY, Sichtermann, EP, Siejka, S, Sikora, R, Simko, M, Singha, S, Smirnov, N, Smirnov, D, Solyst, W, Sorensen, P, Spinka, HM, Srivastava, B, Stanislaus, TDS, Stewart, DJ, Strikhanov, M, Stringfellow, B, Suaide, AAP, Sugiura, T, Sumbera, M, Summa, B, Sun, Y, Sun, X, Sun, XM, Surrow, B, Svirida, DN, Szymanski, P, Tang, Z, Tang, AH, Taranenko, A, Tarnowsky, T, Thomas, JH, Timmins, AR, Tlusty, D, Todoroki, T, Tokarev, M, Tomkiel, CA, Trentalange, S, Tribble, RE, Tribedy, P, Tripathy, SK, Tsai, OD, Tu, B, Ullrich, T, Underwood, DG, Upsal, I, Van Buren, G, Vanek, J, Vasiliev, AN, Vassiliev, I, Videbaek, F, Vokal, S, Voloshin, SA, Vossen, A, Wang, G, Wang, Y, Wang, F, Wang, Y, Webb, JC, Wen, L, Westfall, GD, Wieman, H, Wissink, SW, Witt, R, Wu, Y, Xiao, ZG, Xie, G, Xie, W, Xu, QH, Xu, Z, Xu, J, Xu, YF, Xu, N, Yang, S, Yang, C, Yang, Q, Yang, Y, Ye, Z, Yi, L, Yip, K, Yoo, I-K, Yu, N, Zbroszczyk, H, Zha, W, Zhang, Z, Zhang, L, Zhang, Y, Zhang, XP, Zhang, J, Zhang, S, Zhang, S, Zhang, J, Zhao, J, Zhong, C, Zhou, C, Zhou, L, Zhu, Z, Zhu, X and Zyzak, M
(2018)
Longitudinal double-spin asymmetries for pi(0)s in the forward direction for 510 GeV polarized pp collisions.
PHYSICAL REVIEW D, 98 (3).
032013-.
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Abstract
The STAR Collaboration reports measurements of the longitudinal double-spin
asymmetry, $A_{LL}$, for neutral pions produced at forward directions in
polarized proton-proton collisions, at a center-of-mass energy of $510$ GeV.
Results are given for transverse momenta in the range $2<p_{T}<10$ GeV/$c$
within two regions of pseudorapidity that span $2.65<\eta<3.9$. These results
are sensitive to the polarized gluon parton distribution function, $\Delta
g(x)$, down to the region of Bjorken $x \sim 10^{-3}$. The asymmetries observed
are less than $\pm 5 \cdot 10^{-3}$ in magnitude, and will help constrain the
contribution to the spin of the proton from polarized gluons at low $x$, when
combined with other measurements as part of a global analysis.
Dimensions
Dimensions
