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Ackerstaff, K.; Akopov, N.; Akushevich, I.; Amarian, M.; Aschenauer, E.C.; Avakian, R.; Blanchard, S.; Böttcher, H.; Brack, J.; Brauksiepe, S.; Braun, B.; Brons, St; Brüll, A.; Bruins, E.E.W.; Bulten, H.J.; Cadman, R.V.; Chumney, P.; Delheij, P.P.J.; De Sanctis, E.; De Schepper, D.; Düren, M.; Dvoredsky, A.; Ely, J.; Elbakian, G.; Emerson, J.; Fantoni, A.; Fechtchenko, A.; Ferstl, M.; Filippone, B.W.; Fischer, H.; Frullani, S.; Funk, M.-A.; Gagunashvili, N.D.; Galumian, P.; Garibaldi, F.; Gavrilov, G.; Gharibyan, V.; Golendukhin, A.; Graw, G.; Heinsius, F.H.; Henkes, Th; Hertenberger, R.; Izotov, A.; Jackson, H.E.; Jones, C.; Kestel, M.; Kinney, E.; Kirsch, M.; Kitching, P.; Königsmann, K.; Kolstein, M.; Kolster, H.; Korsch, W.; Kozlov, V.; Kramer, L.H.; Lorenzon, W.; Lung, A.; Makins, N.C.R.; McIlhany, K.; Meissner, F.; Mercer, D.; Metz, A.; Miller, C.A.; Mitsyn, V.; Naryshkin, Yu; Nathan, A.M.; Niczyporuk, J.M.; Owen, B.R.; Papavassiliou, V.; Pate, S.F.; Rakness, G.; Reali, A.; Reolon, A.R.; Ristinen, R.; Röper, G.; Rossi, P.; Rudnitsky, S.; Sakemi, Y.; Scarlett, C.; Schmidt, F.; Schmitt, H.; Schwind, A.; Sinram, K.; Slavich, P.; Smythe, W.R.; Spengos, M.; Stoesslein, U.; Sutter, M.; Taroian, S.; Terkulov, A.; Trudel, A.; Tytgat, M.; van Hunen, J.J.; van de Vyver, R.; van der Steenhoven, G.; Volk, E.; Welch, T.P.; Wendland, J.; Williamson, S.E.; Yoneyama, S.
Physics letters. B, 10/1999, Letnik: 464, Številka: 1Journal Article
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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in: SICRIS
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