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Longitudinal double-spin asymmetries for p0s in the forward direction for 510 GeV polarized pp collisions

  • J. Adam
  • , L. Adamczyk
  • , J. R. Adams
  • , J. K. Adkins
  • , G. Agakishiev
  • , M. M. Aggarwal
  • , Z. Ahammed
  • , N. N. Ajitanand
  • , I. Alekseev
  • , D. M. Anderson
  • , R. Aoyama
  • , A. Aparin
  • , D. Arkhipkin
  • , E. C. Aschenauer
  • , M. U. Ashraf
  • , F. Atetalla
  • , A. Attri
  • , G. S. Averichev
  • , X. Bai
  • , V. Bairathi
  • K. Barish, A. J. Bassill, A. Behera, R. Bellwied, A. Bhasin, A. K. Bhati, J. Bielcik, J. Bielcikova, L. C. Bland, I. G. Bordyuzhin, J. D. Brandenburg, A. V. Brandin, D. Brown, J. Bryslawskyj, I. Bunzarov, J. Butterworth, H. Caines, M. Calderón De La Barca Sánchez, J. M. Campbell, D. Cebra, I. Chakaberia, P. Chaloupka, F. H. Chang, Z. Chang, N. Chankova-Bunzarova, A. Chatterjee, S. Chattopadhyay, J. H. Chen, X. Chen, X. Chen, J. Cheng, M. Cherney, W. Christie, G. Contin, H. J. Crawford, S. Das, T. G. Dedovich, I. M. Deppner, A. A. Derevschikov, L. Didenko, C. Dilks, X. Dong, J. L. Drachenberg, J. C. Dunlop, L. G. Efimov, N. Elsey, J. Engelage, G. Eppley, R. Esha, S. Esumi, O. Evdokimov, J. Ewigleben, O. Eyser, R. Fatemi, S. Fazio, P. Federic, P. Federicova, J. Fedorisin, P. Filip, E. Finch, Y. Fisyak, C. E. Flores, L. Fulek, C. A. Gagliardi, T. Galatyuk, F. Geurts, A. Gibson, D. Grosnick, D. S. Gunarathne, Y. Guo, A. Gupta, W. Guryn, A. I. Hamad, A. Hamed, A. Harlenderova, J. W. Harris, L. He, S. Heppelmann, S. Heppelmann, N. Herrmann, A. Hirsch, L. Holub, S. Horvat, X. Huang, B. Huang, S. L. Huang, H. Z. Huang, T. Huang, T. J. Humanic, P. Huo, G. Igo, W. W. Jacobs, A. Jentsch, J. Jia, K. Jiang, S. Jowzaee, E. G. Judd, S. Kabana, D. Kalinkin, K. Kang, D. Kapukchyan, K. Kauder, H. W. Ke, D. Keane, A. Kechechyan, D. P. Kikoła, C. Kim, T. A. Kinghorn, I. Kisel, A. Kisiel, L. Kochenda, L. K. Kosarzewski, A. F. Kraishan, L. Kramarik, L. Krauth, P. Kravtsov, K. Krueger, N. Kulathunga, S. Kumar, L. Kumar, J. Kvapil, J. H. Kwasizur, R. Lacey, J. M. Landgraf, J. Lauret, A. Lebedev, R. Lednicky, J. H. Lee, X. Li, C. Li, W. Li, Y. Li, Y. Liang, J. Lidrych, T. Lin, A. Lipiec, M. A. Lisa, F. Liu, P. Liu, H. Liu, Y. Liu, T. Ljubicic, W. J. Llope, M. Lomnitz, R. S. Longacre, X. Luo, S. Luo, G. L. Ma, Y. G. Ma, L. Ma, R. Ma, N. Magdy, R. Majka, D. Mallick, S. Margetis, C. Markert, H. S. Matis, O. Matonoha, D. Mayes, J. A. Mazer, K. Meehan, J. C. Mei, N. G. Minaev, S. Mioduszewski, D. Mishra, B. Mohanty, M. M. Mondal, I. Mooney, D. A. Morozov, Md Nasim, J. D. Negrete, J. M. Nelson, D. B. Nemes, M. Nie, G. Nigmatkulov, T. Niida, L. V. Nogach, T. Nonaka, S. B. Nurushev, G. Odyniec, A. Ogawa, K. Oh, S. Oh, V. A. Okorokov, D. Olvitt, B. S. Page, R. Pak, Y. Panebratsev, B. Pawlik, H. Pei, C. Perkins, J. Pluta, J. Porter, M. Posik, N. K. Pruthi, M. Przybycien, J. Putschke, A. Quintero, S. K. Radhakrishnan, S. Ramachandran, R. L. Ray, R. Reed, H. G. Ritter, J. B. Roberts, O. V. Rogachevskiy, J. L. Romero, L. Ruan, J. Rusnak, O. Rusnakova, N. R. Sahoo, P. K. Sahu, S. Salur, J. Sandweiss, J. Schambach, A. M. Schmah, W. B. Schmidke, N. Schmitz, B. R. Schweid, F. Seck, J. Seger, M. Sergeeva, R. Seto, P. Seyboth, N. Shah, E. Shahaliev, P. V. Shanmuganathan, M. Shao, W. Q. Shen, F. Shen, S. S. Shi, Q. Y. Shou, E. P. Sichtermann, S. Siejka, R. Sikora, M. Simko, S. Singha, N. Smirnov, D. Smirnov, W. Solyst, P. Sorensen, H. M. Spinka, B. Srivastava, T. D.S. Stanislaus, D. J. Stewart, M. Strikhanov, B. Stringfellow, A. A.P. Suaide, T. Sugiura, M. Sumbera, B. Summa, Y. Sun, X. Sun, X. M. Sun, B. Surrow, D. N. Svirida, P. Szymanski, Z. Tang, A. H. Tang, A. Taranenko, T. Tarnowsky, J. H. Thomas, A. R. Timmins, D. Tlusty, T. Todoroki, M. Tokarev, C. A. Tomkiel, S. Trentalange, R. E. Tribble, P. Tribedy, S. K. Tripathy, O. D. Tsai, B. Tu, T. Ullrich, D. G. Underwood, I. Upsal, G. Van Buren, J. Vanek, A. N. Vasiliev, I. Vassiliev, F. Videbæk, S. Vokal, S. A. Voloshin, A. Vossen, G. Wang, Y. Wang, F. Wang, Y. Wang, J. C. Webb, L. Wen, G. D. Westfall, H. Wieman, S. W. Wissink, R. Witt, Y. Wu, Z. G. Xiao, G. Xie, W. Xie, Q. H. Xu, Z. Xu, J. Xu, Y. F. Xu, N. Xu, S. Yang, C. Yang, Q. Yang, Y. Yang, Z. Ye, Z. Ye, L. Yi, K. Yip, I. K. Yoo, N. Yu, H. Zbroszczyk, W. Zha, Z. Zhang, L. Zhang, Y. Zhang, X. P. Zhang, J. Zhang, S. Zhang, S. Zhang, J. Zhang, J. Zhao, C. Zhong, C. Zhou, L. Zhou, Z. Zhu, X. Zhu, M. Zyzak
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Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

The STAR Collaboration reports measurements of the longitudinal double-spin asymmetry, ALL, 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<pT<10 GeV/c within two regions of pseudorapidity that span 2.65<η<3.9. These results are sensitive to the polarized gluon parton distribution function, Δg(x), down to the region of Bjorken x∼10-3. The asymmetries observed are less than ±5×10-3 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.

Original languageEnglish
Article number032013
JournalPhysical Review D
Volume98
Issue number3
DOIs
StatePublished - Aug 1 2018

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