/ Experiment-HEP hep-ex/0612059


Beam-Spin Asymmetries in the Azimuthal Distribution of Pion Electroproduction


Airapetian, A. ; Akopov, Z. ; Amarian, M. ; Andrus, A. ; Aschenauer, E.C. ; Augustyniak, W. ; Avakian, H. ; Avakian, R. ; Avetissian, A. ; Avetisyan, E. ; Bacchetta, A. ; Bailey, P. ; Belostotski, S. ; Bianchi, N. ; Blok, H.P. ; Bottcher, H. ; Borissov, A. ; Borysenko, A. ; Brull, A. ; Bryzgalov, V. ; Capiluppi, M. ; Capitani, G.P. ; Ciullo, G. ; Contalbrigo, M. ; Dalpiaz, P.F. ; Deconinck, W. ; De Leo, R. ; Demey, M. ; De Nardo, L. ; De Sanctis, E. ; Devitsin, E. ; Diefenthaler, M. ; Di Nezza, P. ; Dreschler, J. ; Duren, M. ; Ehrenfried, M. ; Elalaoui-Moulay, A. ; Elbakian, G. ; Ellinghaus, F. ; Elschenbroich, U. ; Fabbri, R. ; Fantoni, A. ; Felawka, L. ; Frullani, S. ; Funel, A. ; Gapienko, G. ; Gapienko, V. ; Garibaldi, F. ; Garrow, K. ; Gavrilov, G. ; Gharibyan, V. ; Giordano, F. ; Grebeniouk, O. ; Gregor, I.M. ; Guler, H. ; Hadjidakis, C. ; Hafidi, K. ; Hartig, M. ; Hasch, D. ; Hasegawa, T. ; Hesselink, W.H.A. ; Hillenbrand, A. ; Hoek, M. ; Holler, Y. ; Hommez, B. ; Hristova, I. ; Iarygin, G. ; Ivanilov, A. ; Izotov, A. ; Jackson, H.E. ; Jgoun, A. ; Kaiser, R. ; Keri, T. ; Kinney, E. ; Kisselev, A. ; Kobayashi, T. ; Kopytin, M. ; Korotkov, V. ; Kozlov, V. ; Krauss, B. ; Kravchenko, P. ; Krivokhijine, V.G. ; Lagamba, L. ; Lapikas, L. ; Lenisa, P. ; Liebing, P. ; Linden-Levy, L.A. ; Lorenzon, W. ; Lu, J. ; Lu, S. ; Ma, B.-Q. ; Maiheu, B. ; Makins, N.C.R. ; Mao, Y. ; Marianski, B. ; Marukyan, H. ; Masoli, F. ; Mexner, V. ; Meyners, N. ; Michler, T. ; Mikloukho, O. ; Miller, C.A. ; Miyachi, Y. ; Muccifora, V. ; Murray, M. ; Nagaitsev, A. ; Nappi, E. ; Naryshkin, Y. ; Negodaev, M. ; Nowak, W.-D. ; Oganessyan, K. ; Ohsuga, H. ; Osborne, A. ; Perez-Benito, R. ; Pickert, N. ; Raithel, M. ; Reggiani, D. ; Reimer, P.E. ; Reischl, A. ; Reolon, A.R. ; Riedl, C. ; Rith, K. ; Rosner, G. ; Rostomyan, A. ; Rubacek, L. ; Rubin, J. ; Ryckbosch, D. ; Salomatin, Y. ; Sanjiev, I. ; Savin, Igor A. ; Schafer, A. ; Schnell, G. ; Schuler, K.P. ; Seele, J. ; Seidl, R. ; Seitz, B. ; Shearer, C. ; Shibata, T.-A. ; Shutov, V. ; Sinram, K. ; Stancari, M. ; Statera, M. ; Steffens, E. ; Steijger, J.J.M. ; Stenzel, H. ; Stewart, J. ; Stinzing, F. ; Streit, J. ; Tait, P. ; Tanaka, H. ; Taroian, S. ; Tchuiko, B. ; Terkulov, A. ; Trzcinski, A. ; Tytgat, M. ; Vandenbroucke, A. ; van der Nat, P.B. ; van der Steenhoven, G. ; van Haarlem, Y. ; Vikhrov, V. ; Vogel, C. ; Wang, S. ; Ye, Y. ; Ye, Z. ; Yen, S. ; Zihlmann, B. ; Zupranski, P.

Published in: Phys.Lett.
Year: 2007
Vol.: B648
Page No: 164-170

Abstract: A measurement of the beam-spin asymmetry in the azimuthal distribution of pions produced in semi-inclusive deep-inelastic scattering off protons is presented. The measurement was performed using the {HERMES} spectrometer with a hydrogen gas target and the longitudinally polarized 27.6 GeV positron beam of HERA. The sinusoidal amplitude of the dependence of the asymmetry on the angle $\phi$ of the hadron production plane around the virtual photon direction relative to the lepton scattering plane was measured for $\pi^+,\pi^-$ and $\pi^0$ mesons. The dependence of this amplitude on the Bjorken scaling variable and on the pion fractional energy and transverse momentum is presented. The results are compared to theoretical model calculations.

Web-Page: http://durpdg.dur.ac.uk/cgi-hepdata/hepreac/7025262

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