/ Experiment-HEP arXiv:0907.2596


Single-spin azimuthal asymmetry in exclusive electroproduction of pi+ mesons on transversely polarized protons


Airapetian, A. (Michigan U.) ; Akopov, N. (Yerevan Phys. Inst.) ; Akopov, Z. (DESY) ; Aschenauer, E.C. (DESY, Zeuthen) ; Augustyniak, W. (Warsaw, Inst. Nucl. Studies) ; Avetissian, A. (Yerevan Phys. Inst.) ; Avetisyan, E. (DESY) ; Ball, B. (Michigan U.) ; Belostotski, S. (St. Petersburg, INP) ; Bianchi, N. (Frascati) ; Blok, H.P. (Vrije U., Amsterdam) ; Bottcher, H. (DESY, Zeuthen) ; Bonomo, C. (Ferrara U.) ; Borissov, A. (DESY) ; Bryzgalov, V. (Serpukhov, IHEP) ; Burns, J. (Glasgow U.) ; Capiluppi, M. (Ferrara U.) ; Capitani, G.P. (Frascati) ; Cisbani, E. (Rome, ISS) ; Ciullo, G. (Ferrara U.) ; Contalbrigo, M. (Ferrara U.) ; Dalpiaz, P.F. (Ferrara U.) ; Deconinck, W. (Michigan U.) ; De Leo, R. (INFN, Bari) ; De Nardo, L. (DESY) ; De Sanctis, E. (Frascati) ; Diefenthaler, M. (Erlangen - Nuremberg U.) ; Di Nezza, P. (Frascati) ; Dreschler, J. (NIKHEF, Amsterdam) ; Duren, M. (Giessen U.) ; Ehrenfried, M. (Giessen U.) ; Elbakian, G. (Yerevan Phys. Inst.) ; Ellinghaus, F. (Colorado U.) ; Fabbri, R. (DESY, Zeuthen) ; Fantoni, A. (Frascati) ; Felawka, L. (TRIUMF) ; Frullani, S. (Rome, ISS) ; Gabbert, D. (DESY, Zeuthen) ; Gapienko, V. (Serpukhov, IHEP) ; Garibaldi, F. (Rome, ISS) ; Gharibyan, V. (Yerevan Phys. Inst.) ; Giordano, F. (Ferrara U.) ; Gliske, S. (Michigan U.) ; Hadjidakis, C. (Frascati) ; Hartig, M. (DESY) ; Hasch, D. (Frascati) ; Hill, G. (Glasgow U.) ; Hillenbrand, A. (DESY, Zeuthen) ; Hoek, M. (Glasgow U.) ; Holler, Y. (DESY) ; Hristova, I. (DESY, Zeuthen) ; Imazu, Y. (Tokyo Inst. Tech.) ; Ivanilov, A. (Serpukhov, IHEP) ; Jackson, H.E. (Argonne) ; Jo, H.S. (Gent U.) ; Joosten, S. (Gent U.) ; Kaiser, R. (Glasgow U.) ; Keri, T. (Giessen U.) ; Kinney, E. (Colorado U.) ; Kisselev, A. (St. Petersburg, INP) ; Kobayashi, N. (Tokyo Inst. Tech.) ; Korotkov, V. (Serpukhov, IHEP) ; Kravchenko, P. (St. Petersburg, INP) ; Lagamba, L. (INFN, Bari) ; Lamb, R. (Illinois U., Urbana) ; Lapikas, L. (NIKHEF, Amsterdam) ; Lehmann, I. (Glasgow U.) ; Lenisa, P. (Ferrara U.) ; Linden-Levy, L.A. (Illinois U., Urbana) ; Lopez Ruiz, A. (Gent U.) ; Lorenzon, W. (Michigan U.) ; Lu, X.-G. (DESY, Zeuthen) ; Lu, X.-R. (Tokyo Inst. Tech.) ; Ma, B.-Q. (Peking U.) ; Mahon, D. (Glasgow U.) ; Makins, N.C.R. (Illinois U., Urbana) ; Manaenkov, S.I. (St. Petersburg, INP) ; Manfre, L. (Rome, ISS) ; Mao, Y. (Peking U.) ; Marianski, B. (Warsaw, Inst. Nucl. Studies) ; Martinez de la Ossa, A. (Colorado U.) ; Marukyan, H. (Yerevan Phys. Inst.) ; Miller, C.A. (TRIUMF) ; Miyachi, Y. (Tokyo Inst. Tech.) ; Movsisyan, A. (Yerevan Phys. Inst.) ; Muccifora, V. (Frascati) ; Murray, M. (Glasgow U.) ; Mussgiller, A. (Erlangen - Nuremberg U.) ; Nappi, E. (INFN, Bari) ; Naryshkin, Y. (St. Petersburg, INP) ; Nass, A. (Erlangen - Nuremberg U.) ; Nowak, W.-D. (DESY, Zeuthen) ; Pappalardo, L.L. (Ferrara U.) ; Perez-Benito, R. (Giessen U.) ; Reimer, P.E. (Argonne) ; Reolon, A.R. (Frascati) ; Riedl, C. (DESY, Zeuthen) ; Rith, K. (Erlangen - Nuremberg U.) ; Rosner, G. (Glasgow U.) ; Rostomyan, A. (DESY) ; Rubin, J. (Illinois U., Urbana) ; Ryckbosch, D. (Gent U.) ; Salomatin, Y. (Serpukhov, IHEP) ; Sanftl, F. (Regensburg U.) ; Schafer, A. (Regensburg U.) ; Schnell, G. (Gent U.) ; Schuler, K.P. (DESY) ; Seitz, B. (Glasgow U.) ; Shibata, T.-A. (Tokyo Inst. Tech.) ; Shutov, V. (Dubna, JINR) ; Stancari, M. (Ferrara U.) ; Statera, M. (Ferrara U.) ; Steijger, J.J.M. (NIKHEF, Amsterdam) ; Stenzel, H. (Giessen U.) ; Stewart, J. (DESY, Zeuthen) ; Taroian, S. (Yerevan Phys. Inst.) ; Terkulov, A. (Lebedev Inst.) ; Trzcinski, A. (Warsaw, Inst. Nucl. Studies) ; Tytgat, M. (Gent U.) ; Vandenbroucke, A. (Gent U.) ; van der Nat, A. (NIKHEF, Amsterdam) ; Van Haarlem, Y. (Gent U.) ; Van Hulse, C. (Gent U.) ; Varanda, M. (DESY) ; Veretennikov, D. (St. Petersburg, INP) ; Vikhrov, V. (St. Petersburg, INP) ; Vilardi, I. (INFN, Bari) ; Vogel, C. (Erlangen - Nuremberg U.) ; Wang, S. (Peking U.) ; Yaschenko, S. (Erlangen - Nuremberg U.) ; Ye, H. (Peking U.) ; Ye, Z. (DESY) ; Yen, S. (TRIUMF) ; Yu, W. (Giessen U.) ; Zeiler, D. (Erlangen - Nuremberg U.) ; Zihlmann, B. (DESY) ; Zupranski, P. (Warsaw, Inst. Nucl. Studies)

Published in: Phys.Lett.
Year: 2010
Vol.: B682
Page No: 345-350
Pages: 7

Abstract: Exclusive electroproduction of pi+ mesons was studied by scattering 27.6 GeV positrons or electrons off a transversely polarized hydrogen target. The single-spin azimuthal asymmetry with respect to target polarization was measured as a function of the Mandelstam variable t, the Bjorken scaling variable x_B, and the virtuality Q^2 of the exchanged photon. The extracted Fourier components of the asymmetry were found to be consistent with zero, except one that was found to be large and that involves interference of contributions from longitudinal and transverse virtual photons.

Web-Page: http://inspirebeta.net/record/825794/files/fig_fig1.png; http://inspirebeta.net/record/825794/files/fig_fig2.png

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