Effects of transversity in deep-inelastic scattering by polarized protons

Single-spin asymmetries for pions and charged kaons are measured in semi-inclusive deep-inelastic scattering of positrons and electrons off a transversely nuclear-polarized hydrogen target. The dependence of the cross section on the azimuthal angles of the target polarization (phi_S)and the produced...

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Veröffentlicht in:	arXiv.org 2010-06
Hauptverfasser:	HERMES collaboration, Akopov, N, Akopov, Z, Aschenauer, E C, Avakian, R, Avetissian, A, Avetisyan, E, Bacchetta, A, Belostotski, S, Bianchi, N, Blok, H P, Borissov, A, Bowles, J, Bryzgalov, V, Burns, J, Capiluppi, M, Capitani, G P, Cisbani, E, Ciullo, G, Contalbrigo, M, Deconinck, W, De Leo, R, De Nardo, L, P Di Nezza, Dueren, M, Elbakian, G, Ellinghaus, F, Fantoni, A, Felawka, L, Frullani, S, Gabbert, D, Gapienko, G, Gapienko, V, Gharibyan, V, Giordano, F, Gliske, S, Hasch, D, Hillenbrand, A, Hoek, M, Holler, Y, Imazu, Y, Ivanilov, A, Izotov, A, Jo, H S, Joosten, S, Karyan, G, Kinney, E, Kobayashi, N, Korotkov, V, Kozlov, V, Kravchenko, P, Lagamba, L, Lapikas, L, Lenisa, P, A Lopez Ruiz, Makins, N C R, Manaenkov, S I, Manfre, L, Mao, Y, Marukyan, H, Miller, C A, Miyachi, Y, Movsisyan, A, Murray, M, Nappi, E, W -D Nowak, Perez-Benito, R, Pickert, N, Raithel, M, Reolon, A R, Rosner, G, Rostomyan, A, Rubin, J, Salomatin, Y, Sanftl, F, Schnell, G, Seitz, B, T -A Shibata, Shutov, V, Stancari, M, Statera, M, Steffens, E, Steijger, J J M, Stenzel, H, Stewart, J, Taroian, S, Terkulov, A, Tytgat, M, Y Van Haarlem, C Van Hulse, Veretennikov, D, Vikhrov, V, Vilardi, I, Vogel, C, Yaschenko, S, H Ye, Z Ye, W Yu, Zihlmann, B, Zupranski, P
Format:	Artikel
Sprache:	eng
Schlagworte:	Dependence Distribution functions Inelastic scattering Kaons Physics - High Energy Physics - Experiment Pions Positrons
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Zusammenfassung:	Single-spin asymmetries for pions and charged kaons are measured in semi-inclusive deep-inelastic scattering of positrons and electrons off a transversely nuclear-polarized hydrogen target. The dependence of the cross section on the azimuthal angles of the target polarization (phi_S)and the produced hadron (phi) is found to have a substantial sin(phi+phi_S) modulation for the production of pi+, pi- and K+. This Fourier component can be interpreted in terms of non-zero transversity distribution functions and non-zero favored and disfavored Collins fragmentation functions with opposite sign. For pi0 and K- production the amplitude of this Fourier component is consistent with zero.
ISSN:	2331-8422
DOI:	10.48550/arxiv.1006.4221