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

1999; Elsevier BV; Volume: 464; Issue: 1-2 Linguagem: Inglês

10.1016/s0370-2693(99)00964-8

1873-2445

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

Quantum Chromodynamics and Particle Interactions

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 3He targets, in the kinematic range 0.023<x<0.6 and 1 GeV2<Q2<10 GeV2. Polarized quark distributions are extracted as a function of x for up (u+ū) and down (d+d̄) 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 Δq3 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.