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Phys Rev Lett. 2009 Oct 09;103(15):152002. doi: 10.1103/PhysRevLett.103.152002. Epub 2009 Oct 09.

Observation of the naive-T-odd Sivers effect in deep-inelastic scattering.

Physical review letters

A Airapetian, N Akopov, Z Akopov, E C Aschenauer, W Augustyniak, A Avetissian, E Avetisyan, A Bacchetta, B Ball, N Bianchi, H P Blok, H Böttcher, C Bonomo, A Borissov, V Bryzgalov, J Burns, M Capiluppi, G P Capitani, E Cisbani, G Ciullo, M Contalbrigo, P F Dalpiaz, W Deconinck, R De Leo, L De Nardo, E De Sanctis, M Diefenthaler, P Di Nezza, J Dreschler, M Düren, M Ehrenfried, G Elbakian, F Ellinghaus, U Elschenbroich, R Fabbri, A Fantoni, L Felawka, S Frullani, D Gabbert, G Gapienko, V Gapienko, F Garibaldi, V Gharibyan, F Giordano, S Gliske, C Hadjidakis, M Hartig, D Hasch, G Hill, A Hillenbrand, M Hoek, Y Holler, I Hristova, Y Imazu, A Ivanilov, H E Jackson, H S Jo, S Joosten, R Kaiser, T Keri, E Kinney, A Kisselev, V Korotkov, V Kozlov, P Kravchenko, L Lagamba, R Lamb, L Lapikás, I Lehmann, P Lenisa, L A Linden-Levy, A López Ruiz, W Lorenzon, X-G Lu, X-R Lu, B-Q Ma, D Mahon, N C R Makins, S I Manaenkov, L Manfré, Y Mao, B Marianski, A Martinez de la Ossa, H Marukyan, C A Miller, Y Miyachi, A Movsisyan, M Murray, A Mussgiller, E Nappi, Y Naryshkin, A Nass, M Negodaev, W-D Nowak, L L Pappalardo, R Perez-Benito, P E Reimer, A R Reolon, C Riedl, K Rith, G Rosner, A Rostomyan, J Rubin, D Ryckbosch, Y Salomatin, F Sanftl, A Schäfer, G Schnell, K P Schüler, B Seitz, T-A Shibata, V Shutov, M Stancari, M Statera, J J M Steijger, H Stenzel, J Stewart, F Stinzing, S Taroian, A Terkulov, A Trzcinski, M Tytgat, A Vandenbroucke, P B van der Nat, Y Van Haarlem, C Van Hulse, M Varanda, D Veretennikov, V Vikhrov, I Vilardi, C Vogel, S Wang, S Yaschenko, H Ye, Z Ye, S Yen, W Yu, D Zeiler, B Zihlmann, P Zupranski,

Affiliations

  1. Physikalisches Institut, Universität Giessen, 35392 Giessen, Germany.

PMID: 19905623 DOI: 10.1103/PhysRevLett.103.152002

Abstract

Azimuthal single-spin asymmetries of leptoproduced pions and charged kaons were measured on a transversely polarized hydrogen target. Evidence for a naive-T-odd, transverse-momentum-dependent parton distribution function is deduced from nonvanishing Sivers effects for pi(+), pi(0), and K(+/-), as well as in the difference of the pi(+) and pi(-) cross sections.

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