The spin structure function gp1 of the proton and a test of the Bjorken sum rule

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Title:	The spin structure function gp1 of the proton and a test of the Bjorken sum rule
Authors:	彭仁傑;Adolph, C.;Alexeev, M.G.;Alexeev, G.D.;Andrieux, V.;Balestra, F.;Beck, R.;Bedfer, Y.;Bicker, K.;Bielert, E.R.;Bisplinghoff, J.;Bodlak, M.;Boer, M.;Bradamante, F.;Bressan, A.;Büchele, M.;Burtin, E.;Capozza, L.;Chang, W.-C.;Chiosso, M.;Chung, S.U.;Curiel, Q.;Dasgupta, S.S.;Dasgupta, S.;Denisov, O.Yu;Donskov, S.V.;Doshita, N.;Duic, V.;Dziewiecki, M.;Efremov, A.;Eyrich, W.;Ferrero, A.;Finger, M.;Fischer, H.;Friedrich, J.M.;Fuchey, E.;Gavrichtchouk, O.P.;Gerassimov, S.;Giordano, F.;Gnesi, I.;Grabmüller, S.;Grasso, A.;Grosse-Perdekamp, M.;Grussenmeyer, T.;Guskov, A.;von Harrach, D.;Hashimoto, R.;Herrmann, F.;Hinterberger, F.;Horikawa, N.;Ivanov, A.;Khaustov, G.V.;Koivuniemi, J.H.;Königsmann, K.;Kotzinian, A.M.;Kuchinski, N.;Kunne, F.;Kurek, K.;Kurjata, R.P.;Levorato, S.;Longo, R.;Makins, N.;Marchand, C.;Martin, A.;Marzec, J.;Matsuda, T.;Meyer, W.;Michigami, T.;Nagel, T.;Nikolaenko, V.I.;Nunes, A.S.;Olshevsky, A.G.;Orlov, I.;Ostrick, M.;Pereira, F.;Pesek, M.;Pochodzalla, J.;Polyakov, V.A.;Pretz, J.;Quaresma, M.;Regali, C.;Reicherz, G.;Riedl, C.;Rossiyskaya, N.S.;Samoylenko, V.D.;Santos, C.;Sarkar, S.;Schmieden, H.;Schopferer, S.;Slunecka, M.;Srnka, A.;Sulc, M.;Szabelski, A.;Szameitat, T.;Tessaro, S.;Uhl, S.;Virius, M.;Weisrock, T.;Wilfert, M.;Zavertyaev, M.;Ziembicki, M.
Contributors:	高能與強場物理研究中心
Date:	2016-02-10
Issue Date:	2026-04-23 12:07:54 (UTC+8)
Publisher:	Elsevier;Elsevier B.V
Abstract:	摘要： New results for the double spin asymmetry A1p and the proton longitudinal spin structure function g1p are presented. They were obtained by the COMPASS Collaboration using polarised 200 GeV muons scattered off a longitudinally polarised NH3 target. The data were collected in 2011 and complement those recorded in 2007 at 160 GeV, in particular at lower values of x. They improve the statistical precision of g1p(x) by about a factor of two in the region x≲0.02. A next-to-leading order QCD fit to the g1 world data is performed. It leads to a new determination of the quark spin contribution to the nucleon spin, ΔΣ, ranging from 0.26 to 0.36, and to a re-evaluation of the first moment of g1p. The uncertainty of ΔΣ is mostly due to the large uncertainty in the present determinations of the gluon helicity distribution. A new evaluation of the Bjorken sum rule based on the COMPASS results for the non-singlet structure function g1NS(x,Q2) yields as ratio of the axial and vector coupling constants \|gA/gV\|=1.22±0.05 (stat.)±0.10 (syst.), which validates the sum rule to an accuracy of about 9%. 出版者： Elsevier B.V 出版日期： 2016-02-10 出處： Physics letters. B, 2016-02, Vol.753 (C), p.18-28 資源來源： ScienceDirect (Elsevier) Journals 版權： 2015 The Authors 識別號： ISSN: 0370-2693 識別號： EISSN: 1873-2445 識別號： DOI: 10.1016/j.physletb.2015.11.064
Appears in Collections:	[Center for High Energy and High Field Physics (CHiP)] journal & Dissertation

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