Akademska digitalna zbirka SLovenije - logo
E-viri
Celotno besedilo
  • Single spin azimuthal asymm...
    Airapetian, A.; Akopov, Z.; Avakian, H.; Avakian, R.; Avetissian, E.; Bains, B.; Belostotski, S.; Bernreuther, S.; Borissov, A.; Bouhali, O.; Brack, J.; Brauksiepe, S.; Bruckner, W.; Brull, A.; Brunn, I.; Bulten, H. J.; Capitani, G. P.; Cisbani, E.; Ciullo, G.; Court, G. R.; De Leo, R.; De Schepper, D.; Ehrenfried, M.; Elbakian, G.; Fantoni, A.; Fechtchenko, A.; Felawka, L.; Frullani, S.; Garber, Y.; Garibaldi, F.; Garutti, E.; Gavrilov, G.; Green, P. W.; Haeberli, W.; Hafidi, K.; Hartig, M.; Heesbeen, D.; Henoch, M.; Hesselink, W. H. A.; Holler, Y.; Holt, R. J.; Hommez, B.; Iarygin, G.; Izotov, A.; Kanesaka, J.; Kobayashi, H.; Konigsmann, K.; Kotik, E.; Kozlov, V.; Kyle, G.; Lagamba, L.; Laziev, A.; Lenisa, P.; Lorenzon, W.; Maas, A.; Masoli, F.; McAndrew, M.; McIlhany, K.; Meissner, F.; Meyners, N.; Mikloukho, O.; Milner, R.; Muccifora, V.; Mussa, R.; Nappi, E.; Naryshkin, Y.; Nass, A.; Owen, B. R.; Pate, S. F.; Potashov, S.; Raithel, M.; Rakness, G.; Redwine, R.; Reolon, A. R.; Rith, K.; Robinson, D.; Rostomyan, A.; Ruh, M.; Ryckbosch, D.; Sanjiev, I.; Scarlett, C.; Schuler, K. P.; Schwind, A.; Seibert, J.; Shutov, V.; Simani, M. C.; Steffens, E.; Steijger, J. J. M.; Tessarin, S.; Thomas, E.; Tipton, B.; Tytgat, M.; Urciuoli, G. M.; Van Den Brand, J. F. J.; Van Hunen, J. J.; Vetterli, M. C.; Vikhrov, V.; Vincter, M. G.; Weiskopf, C.; Wendland, J.

    2001
    Report

    A single-spin asymmetry in the azimuthal distribution of neutral pions relative to the lepton scattering plane has been measured for the first time in deep-inelastic scattering of positrons off longitudinally polarized protons. The analysing power in the sin(phi) moment of the cross section is 0.019 +/- 0.007(stat.) +/- 0.003(syst.). This result is compared to single-spin asymmetries for charged pion production measured in the same kinematic range. The pi^0 asymmetry is of the same size as the pi^+ asymmetry and shows a similar dependence on the relevant kinematic variables. The asymmetry is described by a phenomenological calculation based on a fragmentation function that represents sensitivity to the transverse polarization of the struck quark.