Charged-Pion cross sections and double-helicity asymmetries in polarized p+p collisions at √s = 200 GeV

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Title:	Charged-Pion cross sections and double-helicity asymmetries in polarized p+p collisions at √s = 200 GeV
Authors:	彭仁傑;Akiba, Y.;Aramaki, Y.;Armendariz, R.;Awes, T. C.;Azmoun, B.;Bannier, B.;Baumann, C.;Ben-Benjamin, J.;Bennett, R.;Buesching, H.;Bumazhnov, V.;Campbell, S.;Chiu, M.;Christiansen, P.;Chujo, T.;Cole, B. A.;Dairaku, S.;Desmond, E. J.;Engelmore, T.;Fadem, B.;Finger, M.;Fleuret, F.;Fokin, S. L.;Frawley, A. D.;Fukao, Y.;Cassagnac, R. Granier de;Grau, N.;Perdekamp, M. Grosse;Guo, L.;Gustafsson, H.-Å.;Hahn, K. I.;Han, R.;Hollis, R. S.;Hong, B.;Ichihara, T.;Ikeda, Y.;Isenhower, D.;Johnson, B. M.;Jouan, D.;Kang, J. H.;Kempel, T.;Kim, B. I.;Kistenev, E.;Kline, P.;Koster, J.;Král, A.;Kwon, Y.;Lee, K. B.;Lynch, D.;Mao, Y.;Miki, K.;Mitchell, J. T.;Miyachi, Y.;Mohanty, A. K.;Moon, H. J.;Morino, Y.;Naglis, M.;Nagy, M. I.;Nakamura, T.;Oka, M.;Okada, K.;Oskarsson, A.;Pantuev, V.;Papavassiliou, V.;Park, B. H.;Park, I. H.;Purschke, M. L.;Read, K. F.;Rolnick, S. D.;Sahlmueller, B.;Saito, N.;Samsonov, V.;Sarsour, M.;Savastio, M.;Seto, R.;Shibata, T.-A.;Shukla, P.;Sourikova, I. V.;Stenlund, E.;Sziklai, J.;Tarafdar, S.;Tennant, E.;Themann, H.;Thomas, D.;Torii, H.;Towell, R. S.;Tserruya, I.;Vale, C.;Veicht, A.;Velkovska, J.;Virius, M.;Vrba, V.;Watanabe, D.;Watanabe, Y.;Watanabe, Y. S.;Winter, D.;Wright, R. M.;Yanovich, A.;Yoo, J. S.;Yushmanov, I. E.
Contributors:	高能與強場物理研究中心
Keywords:	[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Date:	2015-01-01
Issue Date:	2026-04-23 12:00:09 (UTC+8)
Publisher:	American Physical Society;American Physical Society (APS)
Abstract:	摘要： We present midrapidity charged-pion invariant cross sections, the ratio of the π− to π+ cross sections and the charge-separated double-spin asymmetries in polarized p+p collisions at s√=200 GeV. While the cross section measurements are consistent within the errors of next-to-leading-order (NLO) perturbative quantum chromodynamics predictions (pQCD), the same calculations overestimate the ratio of the charged-pion cross sections. This discrepancy arises from the cancellation of the substantial systematic errors associated with the NLO-pQCD predictions in the ratio and highlights the constraints these data will place on flavor-dependent pion fragmentation functions. The charge-separated pion asymmetries presented here sample an x range of ∼0.03–0.16 and provide unique information on the sign of the gluon-helicity distribution International audience 出版者： American Physical Society (APS) 出版日期： 2015-02-02 出處： Physical Review D, 2015-02, Vol.91 (3) 識別號： ISSN: 1550-7998 識別號： DOI: 10.1103/physrevd.91.032001
Appears in Collections:	[Center for High Energy and High Field Physics (CHiP)] journal & Dissertation

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