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  • Single-spin azimuthal asymm...
    Akopov, N.; Amarian, M.; Aschenauer, E.C.; Avakian, H.; Avakian, R.; Avetissian, E.; Bailey, P.; Baturin, V.; Belostotski, S.; Bernreuther, S.; Borissov, A.; Bouwhuis, M.; Capitani, G.P.; Ciullo, G.; Dalpiaz, P.F.; De Leo, R.; De Nardo, L.; de Witt Huberts, P.K.A.; Di Nezza, P.; Ellinghaus, F.; Fantoni, A.; Fechtchenko, A.; Felawka, L.; Fox, B.; Franz, J.; Frullani, S.; Gärber, Y.; Garibaldi, F.; Garutti, E.; Gavrilov, G.; Grebeniouk, O.; Greeniaus, L.G.; Haeberli, W.; Hafidi, K.; Hasch, D.; Heesbeen, D.; Heinsius, F.H.; Hesselink, W.H.A.; Hofman, G.; Holt, R.J.; Hommez, B.; Izotov, A.; Jgoun, A.; Kolster, H.; Korotkov, V.; Kotik, E.; Kyle, G.; Laziev, A.; Lenisa, P.; Liebing, P.; Lindemann, T.; Lorenzon, W.; Maas, A.; Makins, N.C.R.; Marukyan, H.; McIlhany, K.; Menden, F.; Mexner, V.; Nappi, E.; Negodaeva, K.; Nowak, W.-D.; Oganessyan, K.; Owen, B.R.; Podiatchev, S.; Potterveld, D.H.; Raithel, M.; Rakness, G.; Rappoport, V.; Redwine, R.; Reggiani, D.; Reimer, P.; Reolon, A.R.; Rith, K.; Ryckbosch, D.; Sakemi, Y.; Sato, F.; Schill, C.; Schnell, G.; Schüler, K.P.; Seibert, J.; Seitz, B.; Shutov, V.; Simani, M.C.; Sinram, K.; Steffens, E.; Taroian, S.; Terkulov, A.; Thomas, E.; Tytgat, M.; Urciuoli, G.M.; van den Brand, J.F.J.; Vetterli, M.C.; Vikhrov, V.; Vincter, M.G.; Visser, J.; Volmer, J.; Wendland, J.; Wise, T.; Yen, S.; Zohrabian, H.

    Physics letters. B, 05/2002, Letnik: 535, Številka: 1
    Journal Article

    A single-spin asymmetry in the distribution of exclusively produced π + mesons azimuthally around the virtual photon direction relative to the lepton scattering plane has been measured for the first time in deep-inelastic scattering of positrons off longitudinally polarized protons. Integrated over the experimental acceptance, the sin φ moment of the polarization asymmetry of the cross section is measured to be −0.18±0.05(stat.)±0.02(syst.). The asymmetry is also studied as a function of the relevant kinematic variables, and its magnitude is found to grow with decreasing x and increasing − t and vanish at t→ t min (where x is the Bjorken scaling variable and t is the squared four-momentum transferred to the nucleon).