Flavor decomposition of the polarized quark distributions in the nucleon from inclusive and semi-inclusive deep-inelastic scattering

K Ackerstaff,F Neunreither,H Marukyan,J Blouw,M Kestel,D Fick,K Sinram,H Tallini,D De Schepper,W Hoprich,M Spengos,M Henoch,S Taroian,W Wander,M Guidal,E Thomas,C Baumgarten,A Gute,G Graw,P Kitching,C Simani,A Golendukhin,F Kümmell,E Volk,M Amarian,F Garibaldi,W Haeberli,G Van Der Steenhoven,V Papavassiliou,A Fechtchenko,E De Sanctis,T Wise,G Röper,D Hasch,G Schnell,M Kurisuno,R Openshaw,Y Gärber,L.G Greeniaus,H Kolster,V Vikhrov,P Geiger,K Mcilhany,O Grebeniouk,K Königsmann,K Woller,S Brauksiepe,K Shibatani,B Bains,F Menden,E Devitsin,F Stock,H Ihssen,J Stewart,A Dvoredsky,A Trudel,U Stoesslein,W Lachnit,R Van De Vyver,A Brüll,S Rudnitsky,M Mcandrew,B Tipton,S Frabetti,M Ruh,E Steffens,E Nappi,S Barrow,Y Holler,M Ferstl,J Franz,A Airapetian,A Avetissian,M Nupieri,R Mozzetti,H Zohrabian,P Di Nezza,F Masoli,J Stenger,H Ogami,S Blanchard,P.K.A De Witt Huberts,M Sutter,A Schwind,J Wendland,N Meyners,W Brückner,V Gyurjyan,A Jgoun,O Mikloukho,S Potashov,S Bernreuther,B Bray,V Gharibyan,S Frullani,M Maul,P Oelwein,G.R Court,A Kisselev,S Belostotski,E Cisbani,D Mercer,H Avakian,M Kückes,P Chumney,K Zapfe,G Elbakian,Y Naryshkin ,N Bianchi,W.-D Nowak,J M Niczyporuk ,N Gagunashvili ,R J Holt ,H E Jackson ,M Beckmann,M Tytgat,A Reali,M A Miller ,P.W Green,V Kozlov,Alan M Nathan ,Igor Akushevich ,A Metz,A Simon,M Kolstein,B Owen ,H Bulten ,C E Jones ,N Makins ,Joseph Emerson ,D Ryckbosch,J Visser,J Van Den Brand ,R Avakian,L Kramer ,J Brack,А Нагайцев ,R.a Ristinen ,S Brons ,P Carter,E Kinney,A Lung,H Böttcher,H Fischer,C A Miller ,Matthias Kirsch ,W Lorenzon,D Thiessen ,Р Де Лео ,H T Fortune ,J Haas ,Valeri Valentinovitch Mitsyn ,M L Pitt ,A Borissov,A R Reolon ,В А Коротков ,T Henkes ,K P Schüler ,M C Vetterli ,I Savin,E E W Bruins ,P Galumian,J W Martin ,M G Vincter ,V Muccifora,Andrea Belz ,A Fantoni,B Braun,A Terkulov,Klaus Rith ,R V Cadman ,P Dalpiaz ,M Iodice,S E Williamson ,G P Capitani ,E C Aschenauer ,Andreas Schäfer ,Pietro Slavich ,G Gavrilov,R D Mckeown ,F K Martens ,J O Hansen ,Y Sakemi,T P Welch ,J Ouyang,Gao H ,J Sowiński ,B D Fox ,F Meißner ,G M Urciuoli ,R Hertenberger,Satoshi Yoneyama ,R Milner,G Rakness,T G O’neill ,H Schmitt,T A Shibata ,O Häusser ,J Anthony Seibert ,R Redwine,W R Smythe ,V G Krivokhijine ,C Großhauser ,B W Filippone ,Friedrich Schmidt ,A Mateos,M Düren,M.-A Funk,James H Ely ,T Benisch ,H R Poolman ,D H Potterveld ,P Rossi,Hisao Kobayashi ,R Henderson,Norbert Koch ,C Scarlett,W Korsch,F H Heinsius ,P P J Delheij ,Н Акопов ,G S Kyle ,J J Van Hunen ,B Krause,A Izotov,Taeho Shin ,R Kaiser,V Shutov,K Fiedler,S F Pate ,R W Zurmühle

doi:10.1016/s0370-2693(99)00964-8

Abstract

Spin asymmetries of semi-inclusive cross sections for the production of positively and negatively charged hadrons have been measured in deep-inelastic scattering of polarized positrons on polarized hydrogen and 3 He targets, in the kinematic range 0.023< x<0.6 and 1 GeV 2< Q 2<10 GeV 2. Polarized quark distributions are extracted as a function of x for up (u+ u ̄ ) and down ( d+ d ̄ ) flavors. The up quark polarization is positive and the down quark polarization is negative in the measured range. The polarization of the sea is compatible with zero. The first moments of the polarized quark distributions are presented. The isospin non-singlet combination Δq 3 is consistent with the prediction based on the Bjorken sum rule. The moments of the polarized quark distributions are compared to predictions based on SU(3) f flavor symmetry and to a prediction from lattice QCD.

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