Quark helicity distributions in the nucleon for up, down, and strange quarks from semi-inclusive deep-inelastic scattering
- Airapetian, A.
- Akopov, N.
- Avetissian, E.
- Marianski, B.
- Marukyan, H.
- Masoli, F.
- Mexner, V.
- Meyners, N.
- Mikloukho, O.
- Miller, C. A.
- Miyachi, Y.
- Muccifora, V.
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- Bailey, P.
- Nappi, E.
- Naryshkin, Y.
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- Negodaev, M.
- Nowak, W. D.
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- Ohsuga, H.
- Pickert, N.
- Potashov, S.
- Potterveld, D. H.
- Baturin, V.
- Raithel, M.
- Reggiani, D.
- Reimer, P. E.
- Reischl, A.
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- Rosner, G.
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- Beckmann, M.
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- Ybeles Smit, G.
- Yen, S.
- Zihlmann, B.
- Blok, H. P.
- Zohrabian, H.
- Zupranski, P.
- HERMES Collaboration
- Blumlein, J.
- Akopov, Z.
- Bottcher, H.
- Borissov, A.
- Borysenko, A.
- Bouwhuis, M.
- Brack, J.
- Brull, A.
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- Ammosov, V. V.
- Elbakian, G.
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- Elschenbroich, U.
- Ely, J.
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- Fox, B.
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- Aschenauer, E. C.
- Grebeniouk, O.
- Greeniaus, L. G.
- Gregor, I. M.
- Hafidi, K.
- Hartig, M.
- Hasch, D.
- Heesbeen, D.
- Henoch, M.
- Hertenberger, R.
- Hesselink, W. H. A.
- Augustyniak, W.
- Hillenbrand, A.
- Hoek, M.
- Holler, Y.
- Hommez, B.
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- Kinney, E.
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- Kopytin, M.
- Korotkov, V.
- Kozlov, V.
- Krauss, B.
- Krivokhijine, V. G.
- Lagamba, L.
- Lapikas, Louk
- Avetissian, A.
- Laziev, A.
- Lenisa, P.
- Liebing, P.
- Lindemann, T.
- Linden-Levy, L. A.
- Lipka, K.
- Lorenzon, W.
- Lu, J.
- Maiheu, B.
- Makins, N. C. R.
DOIAbstract
Polarized deep--inelastic scattering data on longitudinally polarized hydrogen and deuterium targets have been used to determine double spin asymmetries of cross sections. Inclusive and semi--inclusive asymmetries for the production of positive and negative pions from hydrogen were obtained in a re--analysis of previously published data. Inclusive and semi--inclusive asymmetries for the production of negative and positive pions and kaons were measured on a polarized deuterium target. The separate helicity densities for the up and down quarks and the anti--up, anti--down, and strange sea quarks were computed from these asymmetries in a ``leading order QCD analysis. The polarization of the up--quark is positive and that of the down--quark is ...
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