Inclusive double-helicity asymmetries in neutral-pion and eta-meson production in p → + p → collisions at s =200GeV

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Title:	Inclusive double-helicity asymmetries in neutral-pion and eta-meson production in p → + p → collisions at s =200GeV
Authors:	彭仁傑;Aidala, C.;Akiba, Y.;Aramaki, Y.;Armendariz, R.;Awes, T. C.;Azmoun, B.;Babintsev, V.;Baublis, V.;Baumann, C.;Broxmeyer, D.;Bunce, G.;Choi, I. J.;Chujo, T.;Datta, A.;Dharmawardane, K. V.;Drapier, O.;Durham, J. M.;Frawley, A. D.;Gong, X.;Gonin, M.;Perdekamp, M. Grosse;Gunji, T.;Hahn, K. I.;Hemmick, T. K.;Hester, T.;Hill, J. C.;Homma, K.;Ichihara, T.;Ikeda, Y.;Isenhower, D.;Johnson, B. M.;Jouan, D.;Kang, J. H.;Kempel, T.;Kim, B. I.;Kim, D. J.;Kistenev, E.;Kline, P.;Koster, J.;Král, A.;Kwon, Y.;Lee, K. B.;Lee, S. H.;Lynch, D.;Mao, Y.;Masui, H.;Miki, K.;Mitchell, J. T.;Miyachi, Y.;Mohanty, A. K.;Moon, H. J.;Morino, Y.;Naglis, M.;Nagy, M. I.;Nakamura, T.;Nihashi, M.;Nouicer, R.;Oka, M.;Okada, K.;Oskarsson, A.;Pak, R.;Pantuev, V.;Papavassiliou, V.;Park, B. H.;Park, I. H.;Patel, L.;Purschke, M. L.;Read, K. F.;Rolnick, S. D.;Sano, S.;Shein, I.;Shimomura, M.;Shoji, K.;Sickles, A.;Silva, C. L.;Silvermyr, D.;Silvestre, C.;Singh, B. K.;Singh, C. P.;Sodre, T.;Stenlund, E.;Sukhanov, A.;Takagui, E. M.;Takahara, A.;Taketani, A.;Tanabe, R.;Tanaka, Y.;Torii, H.;Tserruya, I.;Virius, M.;Vossen, A.;Watanabe, K.;Wessels, J.;White, S. N.;Winter, D.;Yang, R.;Yanovich, A.;Yokkaichi, S.;Yoo, J. S.;Younus, I.
Contributors:	高能與強場物理研究中心
Date:	2014-07-17
Issue Date:	2026-04-23 12:02:48 (UTC+8)
Publisher:	American Physical Society;American Physical Society (APS)
Abstract:	摘要： Results are presented from data recorded in 2009 by the PHENIX experiment at the Relativistic Heavy Ion Collider for the double-longitudinal spin asymmetry, A(LL), for pi(0) and eta production in root s = 200 GeV polarized p + p collisions. Comparison of the pi(0) results with different theory expectations based on fits of other published data showed a preference for small positive values of gluon polarization, Delta G, in the proton in the probed Bjorken x range. The effect of adding the new 2009 pi(0) data to a recent global analysis of polarized scattering data is also shown, resulting in a best fit Delta G(DSSV)([0.05,0.2]) = 0.06(-0.15)(+0.11) in the range 0.05 < x < 0.2, with the uncertainty at Delta chi(2) = 9 when considering only statistical experimental uncertainties. Shifting the PHENIX data points by their systematic uncertainty leads to a variation of the best-fit value of Delta G(DSSV)([0.05,0.2]) between 0.02 and 0.12, demonstrating the need for full treatment of the experimental systematic uncertainties in future global analyses. 出版者： American Physical Society (APS) 出版日期： 2014-07-17 出處： Physical Review D, 2014-07, Vol.90 (1) 識別號： ISSN: 1550-7998 識別號： DOI: 10.1103/physrevd.90.012007
Appears in Collections:	[Center for High Energy and High Field Physics (CHiP)] journal & Dissertation

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