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26 April 2024

» arxiv » 1004.0177

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Exclusive Leptoproduction of Real Photons on a Longitudinally Polarised Hydrogen Target
HERMES Collaboration ; A. Airapetian ; N. Akopov ; Z. Akopov ; E.C. Aschenauer ; W. Augustyniak ; R. Avakian ; A. Avetissian ; E. Avetisyan ; B. Ball ; S. Belostotski ; N. Bianchi ; H.P. Blok ; H. Boettcher ; A. Borissov ; J. Bowles ; I. Brodski ; 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 ; M. Dueren ; M. Ehrenfried ; G. Elbakian ; F. Ellinghaus ; R. Fabbri ; A. Fantoni ; L. Felawka ; S. Frullani ; D. Gabbert ; G. Gapienko ; V. Gapienko ; F. Garibaldi ; G. Gavrilov ; V. Gharibyan ; F. Giordano ; S. Gliske ; M. Golembiovskaya ; C. Hadjidakis ; M. Hartig ; D. Hasch ; G. Hill ; A. Hillenbrand ; M. Hoek ; Y. Holler ; I. Hristova ; Y. Imazu ; A. Ivanilov ; A. Izotov ; H.E. Jackson ; H.S. Jo ; S. Joosten ; R. Kaiser ; G. Karyan ; T. Keri ; E. Kinney ; A. Kisselev ; N. Kobayashi ; V. Korotkov ; V. Kozlov ; P. Kravchenko ; V.G. Krivokhijne ; L. Lagamba ; R. Lamb ; L. Lapikas ; I. Lehmann ; P. Lenisa ; L.A. Linden-Levy ; A. Lopez~Ruiz ; W. Lorenzon ; X.-G. Lu ; X.-R. Lu ; B.-Q. Ma ; D. Mahon ; N.C.R. Makins ; S.I. Manaenkov ; L. Manfre ; Y. Mao ; B. Marianski ; A. Martinez de la Ossa ; H. Marukyan ; C.A. Miller ; Y. Miyachi ; A. Movsisyan ; V. Muccifora ; M. Murray ; A. Mussgiller ; E. Nappi ; Y. Naryshkin ; A. Nass ; M. Negodaev ; W.-D. Nowak ; L.L. Pappalardo ; R. Perez-Benito ; N. Pickert ; M. Raithel ; P.E. Reimer ; A.R. Reolon ; C. Riedl ; K. Rith ; G. Rosner ; A. Rostomyan ; J. Rubin ; D. Ryckbosch ; Y. Salomatin ; F. Sanftl ; A. Schaefer ; G. Schnell ; K.P. Schueler ; B. Seitz ; T.-A. Shibata ; V. Shutov ; M. Stancari ; M. Statera ; E. Steffens ; 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 ; 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 ;
Date:	1 Apr 2010
Abstract:	Polarisation asymmetries are measured for the hard exclusive leptoproduction of real photons from a longitudinally polarised hydrogen target. These asymmetries arise from the deeply virtual Compton scattering and Bethe-Heitler processes. From the data are extracted two asymmetries in the azimuthal distribution of produced real photons about the direction of the exchanged virtual photon: A_UL with respect to the target polarisation and A_LL with respect to the product of the beam and target polarisations. Results for both asymmetries are compared to the predictions from a generalised parton distribution model. The sin(phi) and cos(0phi) amplitudes observed respectively for the A_UL and A_LL asymmetries are compatible with the sizeable predictions from the model. Unexpectedly, a sin(2phi) modulation in the A_UL asymmetry with a magnitude similar to that of the sin(phi) modulation is observed.
Source:	arXiv, 1004.0177
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