/ Experiment-HEP hep-ex/0112022


Single spin azimuthal asymmetry in exclusive electroproduction of pi+ mesons


Airapetian, A. ; Akopov, N. ; Akopov, Z. ; Amarian, M. ; Aschenauer, E.C. ; Avakian, H. ; Avakian, R. ; Avetissian, A. ; Avetissian, E. ; Bailey, P. ; Baturin, V. ; Baumgarten, C. ; Beckmann, M. ; Belostotski, S. ; Bernreuther, S. ; Bianchi, N. ; Bottcher, H. ; Borissov, A. ; Bouhali, O. ; Bouwhuis, M. ; Brack, J. ; Brauksiepe, S. ; Brull, A. ; Brunn, I. ; Bulten, H.J. ; Capitani, G.P. ; Chumney, Pamela R.K. ; Cisbani, E. ; Ciullo, G. ; Court, G.R. ; Dalpiaz, P.F. ; De Leo, R. ; De Nardo, L. ; De Sanctis, E. ; De Schepper, D. ; Devitsin, E. ; de Witt Huberts, P.K.A. ; Di Nezza, P. ; Duren, M. ; Ehrenfried, M. ; Elbakian, G. ; Ellinghaus, F. ; Ely, J. ; Fabbri, R. ; Fantoni, A. ; Fechtchenko, A. ; Felawka, L. ; Filippone, B.W. ; Fischer, H. ; Fox, B. ; Franz, J. ; Frullani, S. ; Garber, Y. ; Garibaldi, F. ; Garutti, E. ; Gavrilov, G. ; Gharibyan, V. ; Graw, G. ; Grebeniouk, O. ; Green, P.W. ; Greeniaus, L.G. ; Gute, A. ; Haeberli, W. ; Hafidi, K. ; Hartig, M. ; Hasch, D. ; Heesbeen, D. ; Heinsius, F.H. ; Henoch, M. ; Hertenberger, R. ; Hesselink, W.H.A. ; Hofman, G. ; Holler, Y. ; Holt, R.J. ; Hommez, B. ; Iarygin, G. ; Izotov, A. ; Jackson, H.E. ; Jgoun, A. ; Jung, P. ; Kaiser, R. ; Kinney, E. ; Kisselev, A. ; Kitching, P. ; Konigsmann, Kay ; Kolster, H. ; Korotkov, V. ; Kotik, E. ; Kozlov, V. ; Krauss, B. ; Krivokhijine, V.G. ; Kyle, G. ; Lagamba, L. ; Laziev, A. ; Lenisa, P. ; Liebing, P. ; Lindemann, T. ; Lorenzon, W. ; Maas, A. ; Makins, N.C.R. ; Marukyan, H. ; Masoli, F. ; McIlhany, Kevin L. ; Meissner, F. ; Menden, F. ; Mexner, V. ; Meyners, N. ; Mikloukho, O. ; Milner, R. ; Muccifora, V. ; Nagaitsev, A. ; Nappi, E. ; Naryshkin, Y. ; Nass, A. ; Negodaeva, K. ; Nowak, W.D. ; Oganessyan, K. ; O'Neill, T.G. ; Owen, B.R. ; Pate, S.F. ; Podiatchev, S. ; Potashov, S. ; Potterveld, David H. ; Raithel, M. ; Rakness, G. ; Rappoport, V. ; Redwine, R. ; Reggiani, D. ; Reimer, P.E. ; Reolon, A.R. ; Rith, K. ; Robinson, D. ; Rostomyan, A. ; Ryckbosch, D. ; Sakemi, Y. ; Sanjiev, I. ; Sato, F. ; Savin, Igor A. ; Scarlett, C. ; Schafer, A. ; Schill, C. ; Schmidt, F. ; Schnell, G. ; Schuler, K.P. ; Schwind, A. ; Seibert, J. ; Seitz, B. ; Shibata, T.A. ; Shutov, V. ; Simani, M.C. ; Simon, A. ; Sinram, K. ; Steffens, E. ; Steijger, J.J.M. ; Stewart, J. ; Stosslein, U. ; Suetsugu, K. ; Taroian, S. ; Terkulov, A. ; Tessarin, S. ; Thomas, E. ; Tipton, B. ; Tytgat, M. ; Urciuoli, G.M. ; van den Brand, J.F.J. ; van der Steenhoven, G. ; van de Vyver, R. ; Vetterli, M.C. ; Vikhrov, V. ; Vincter, M.G. ; Visser, J. ; Volmer, J. ; Weiskopf, C. ; Wendland, J. ; Wilbert, J. ; Wise, T. ; Yen, S. ; Yoneyama, S. ; Zohrabian, H.

Published in: Phys.Lett.
Year: 2002
Vol.: B535
Page No: 85-92
Pages: 6

Abstract: A single-spin asymmetry in the distribution of exclusively produced pi^+ mesons azimuthally around the virtual photon direction relative to the lepton scattering plane has been measured for the first time in deep-inelastic scattering of positrons off longitudinally polarized protons. Integrated over the experimental acceptance, the sin \phi moment of the polarization asymmetry of the cross section is measured to be -0.18 +/- 0.05 (stat.) +/- 0.02 (syst.). The asymmetry is also studied as a function of the relevant kinematic variables, and its magnitude is found to grow with decreasing x and increasing -t and vanish at t -> t_min (where x is the Bjorken scaling variable and t is the squared four-momentum transferred to the nucleon).

Web-Page: http://www.adsabs.harvard.edu/abs/2002PhLB..535...85H; http://alice.cern.ch/format/showfull?sysnb=2288236; http://www.sciencedirect.com/science?_ob=GatewayURL&_origin=SPIRES&_method=citationSearch&_volkey=03702693%23535%2385&_version=1&md5=2ffed53ff93fcbf05fd09ac7b3290a92; http://www.sciencedirect.com/web-editions?_ob=GatewayURL&_origin=SPIRES&_method=citationSearch&_volkey=03702693%23535%2385&_version=1&md5=2ffed53ff93fcbf05fd09ac7b3290a92

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