The spin-dependent structure function of the proton [formula omitted] and a test of the Bjorken sum rule

M Alekseev ,E Rondio,G Jegou,Yu.A Khokhlov,S Ramos,M Virius,N Horikawa,J Ball,F Klein,T Negrini,F Kunne,S Takekawa,C Franco,R Sulej,E Kabuß,M Chiosso,M.P Bussa,R Hermann,H Santos,O Kouznetsov,E Burtin,S Levorato,S Neubert,V Rapatsky,A Lehmann,P Jasinski,A Vossen,E Rocco,R Joosten,K Klimaszewski,Z.V Kroumchtein,Yu Alexandrov,K Kondo,A Korzenev,J Nassalski,A Mann,S.V Donskov,R Birsa,O.Yu Shevchenko,T Michigami,W Schröder,J Lichtenstadt,B Badełek,J Pochodzalla,C Heß,A Bressan,A Magnon,S Koblitz,A Bravar,A Sandacz,C Schill,A Martin,S Sosio,N Doshita,G Sbrizzai,R Konopka,A Amoroso,M Ziembicki,H Wollny,V Duic,K Königsmann,T Hasegawa,R Bertini,J Bernhard,I Gnesi,A El Alaoui,F Herrmann,A Ferrero,Ch Höppner,M Krämer,B Grube,D Kang,G.I Smirnov,M Zavertyaev,V.A Polyakov,B Parsamyan,V Diaz,A Guskov,A.A Lednev,G Baum,S Grabmüller,A Padee,A Maggiora,C Ilgner,A Austregesilo,M Bettinelli,V.D Samoylenko,I Konorov,A Filin,G.V Khaustov,R Garfagnini,G Reicherz,M Colantoni,R Jahn,W Dünnweber,T Schlüter,W Eyrich,R Gushterski,A.M Kotzinian,F Hinterberger,D Von Harrach,J Zhao,J.H Koivuniemi,D Panzieri,A Srnka,D.V Peshekhonov,G Brona,Yu Ivanshin,F Balestra,Q Weitzel,M Faessler,C Quintans,F Nerling,H Fischer,A Zvyagin,D Neyret,R Panknin,P Bordalo,F Robinet,M Finger,S Platchkov,T Nagel,A Grasso,K Kurek,A Cicuttin,M.L Crespo,F Tessarotto,A Mutter,J Marzec,N Zhuravlev,M Maggiora,A Nagaytsev,S Uhl,F Massmann,Y Bedfer,B Ketzer,O.P Gavrichtchouk,I Uman,W Wiślicki,E Zemlyanichkina,S Schopferer,T Matsuda,E Perevalova,M Ostrick,V.N Kolosov,M Stolarski,N.V Vlassov,D.I Ryabchikov,Yu Kisselev,P.D Eversheim,J Bisplinghoff,S Goertz,L Schmitt,J Pretz,P Schiavon,F Gautheron,Yu.V Mikhailov,S Gerassimov,W Meyer,B Gobbo,S Paul,J Barth,K Kowalik,G.K Mallot,L Sinha,G Piragino,R Gazda,J Marroncle,L Dhara,R Geyer,S Tessaro,R Windmolders,L Silva,D Chaberny,F Sozzi,S Ishimoto,G Pesaro,F Bradamante,L Lauser,A Richter,B Pawlukiewicz-Kaminska,S Sarkar,G D Alexeev ,M Šulc ,M A Giorgi ,N D’hose ,К Заремба ,Moinester ,H W Siebert ,S Dasgupta ,A Maximov ,О Денисов ,Tadahisa Iwata ,О N Ivanov ,D Cotic ,T Liška ,F H Heinsius ,L G Tkatchev ,M Slunečka ,А.g Оlshevsky ,Wolfgang Käfer ,Friedrich Jm ,Florian Haas ,G B Pontecorvo ,V Nikolaenko ,J M Le Goff ,Jaroslav Polák ,Sudipta Das ,S Dalla Torre ,I Savin ,Andreas Teufel ,Claude Marchand ,S U Chung ,Ralf Kühn ,A Král ,Jean-François Rajotte ,В.ф Константинов ,M G Sapozhnikov ,A Sissakian ,A S Nunes ,V Alexakhin ,А.в Ефремов

doi:10.1016/j.physletb.2010.05.069

The spin-dependent structure function of the proton [formula omitted] and a test of the Bjorken sum rule

M Alekseev , E Rondio + Show 220 more

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https://doi.org/10.1016/j.physletb.2010.05.069

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Journal: Physics Letters B	Publication Date: Jun 1, 2010
Citations: 153

Affiliation: INFN Sezione di Torino, University of Trieste, INFN Sezione di Trieste, European Organization for Nuclear Research, Czech Technical University in Prague, Nagoya University, University of Turin, Warsaw University of Technology, P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Technical University of Munich, Johannes Gutenberg University Mainz, University of Bonn, Joint Institute for Nuclear Research, Yamagata University, Israel Academy of Sciences and Humanities, University of Warsaw, Institut de Recherche sur les Lois Fondamentales de l'Univers, Atomic Energy and Alternative Energies Commission, CEA Saclay, The Abdus Salam International Centre for Theoretical Physics (ICTP), Ludwig-Maximilians-Universität München, Ruhr University Bochum, University of Erlangen-Nuremberg, University of Eastern Piedmont Amadeo Avogadro, Fundação para a Ciência e Tecnologia, University of Freiburg, Charles University

#Vector Coupling Constants #Bjorken Sum Rule + Show 8 more

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Abstract

The inclusive double-spin asymmetry, A1p, has been measured at COMPASS in deep-inelastic polarised muon scattering off a large polarised NH3 target. The data, collected in the year 2007, cover the range Q2>1(GeV/c)2, 0.004<x<0.7 and improve the statistical precision of g1p(x) by a factor of two in the region x<0.02. The new proton asymmetries are combined with those previously published for the deuteron to extract the non-singlet spin-dependent structure function g1NS(x,Q2). The isovector quark density, Δq3(x,Q2), is evaluated from a NLO QCD fit of g1NS. The first moment of Δq3 is in good agreement with the value predicted by the Bjorken sum rule and corresponds to a ratio of the axial and vector coupling constants |gA/gV|=1.28±0.07(stat.)±0.10(syst.).

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