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Measurement of Deeply Virtual Compton Scattering Beam-Spin Asymmetries

F.X. Girod 1 R.A. Niyazov H. Avakian J. Ball 1 I. Bedlinskiy V.D. Burkert R. de Masi 1, 2 L. Elouadrhiri M. Garcon 1 M. Guidal 2 H.S. Jo 2 K. Joo V. Kubarovsky S.V. Kuleshov M. Maccormick 2 S. Niccolai 2 O. Pogorelko F. Sabatie 1 S. Stepanyan P. Stoler M. Ungaro B. Zhao M.J. Amaryan P. Ambrozewicz M. Anghinolfi G. Asryan H. Bagdasaryan N. Baillie J.P. Ball N.A. Baltzell V. Batourine M. Battaglieri M. Bellis N. Benmouna B.L. Berman A.S. Biselli L. Blaszczyk S. Bouchigny 2 S. Boiarinov R. Bradford D. Branford W.J. Briscoe W.K. Brooks S. Bultmann C. Butuceanu J.R. Calarco S.L. Careccia D.S. Carman L. Casey S. Chen L. Cheng P.L. Cole P. Collins P. Coltharp D. Crabb V. Crede N. Dashyan E. de Sanctis R. de Vita P.V. Degtyarenko A. Deur K.V. Dharmawardane R. Dickson C. Djalali G.E. Dodge J. Donnelly D. Doughty M. Dugger O.P. Dzyubak H. Egiyan K.S. Egiyan L. El Fassi P. Eugenio G. Fedotov G. Feldman H. Funsten G. Gavalian G.P. Gilfoyle K.L. Giovanetti J.T. Goetz A. Gonenc R.W. Gothe K.A. Griffioen N. Guler L. Guo V. Gyurjyan K. Hafidi H. Hakobyan C. Hanretty F.W. Hersman K. Hicks I. Hleiqawi M. Holtrop C. E. Hyde 3 Y. Ilieva D.G. Ireland B.S. Ishkhanov E.L. Isupov M.M. Ito D. Jenkins J.R. Johnstone H.G. Juengst N. Kalantarians J.D. Kellie M. Khandaker W. Kim A. Klein F.J. Klein A.V. Klimenko M. Kossov Z. Krahn L.H. Kramer J. Kuhn S.E. Kuhn J. Lachniet J.M. Laget J. Langheinrich D. Lawrence T. Lee K. Livingston H.Y. Lu N. Markov P. Mattione M. Mazouz 4 B. Mckinnon B.A. Mecking M.D. Mestayer C.A. Meyer T. Mibe B. Michel 3 K. Mikhailov M. Mirazita R. Miskimen V. Mokeev K. Moriya S.A. Morrow 1, 2 M. Moteabbed E. Munevar G.S. Mutchler P. Nadel-Turonski R. Nasseripour G. Niculescu I. Niculescu B.B. Niczyporuk M.R. Niroula M. Nozar M. Osipenko A.I. Ostrovidov K. Park E. Pasyuk C. Paterson S. Anefalos Pereira J. Pierce N. Pivnyuk D. Pocanic S. Pozdniakov J.W. Price S. Procureur 1 Y. Prok D. Protopopescu B.A. Raue G. Ricco M. Ripani B.G. Ritchie G. Rosner P. Rossi J. Salamanca C. Salgado J.P. Santoro V. Sapunenko R.A. Schumacher V.S. Serov Y.G. Sharabian D. Sharov N.V. Shvedunov E.S. Smith L.C. Smith D.I. Sober D. Sokhan A. Stavinsky S.S. Stepanyan B.E. Stokes I.I. Strakovsky S. Strauch M. Taiuti D.J. Tedeschi A. Tkabladze S. Tkachenko C. Tur M.F. Vineyard A.V. Vlassov E. Voutier 4 D.P. Watts L.B. Weinstein D.P. Weygand M. Williams E. Wolin M.H. Wood A. Yegneswaran L. Zana J. Zhang Z.W. Zhao
Abstract : The beam spin asymmetries in the hard exclusive electroproduction of photons on the proton (ep -> epg) were measured over a wide kinematic range and with high statistical accuracy. These asymmetries result from the interference of the Bethe-Heitler process and of deeply virtual Compton scattering. Over the whole kinematic range (x_B from 0.11 to 0.58, Q^2 from 1 to 4.8 GeV^2, -t from 0.09 to 1.8 GeV^2), the azimuthal dependence of the asymmetries is compatible with expectations from leading-twist dominance, A = a*sin(phi)/[1+c*cos(phi)]. This extensive set of data can thus be used to constrain significantly the generalized parton distributions of the nucleon in the valence quark sector.
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Submitted on : Friday, November 30, 2007 - 11:12:00 AM
Last modification on : Wednesday, September 16, 2020 - 4:08:30 PM

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F.X. Girod, R.A. Niyazov, H. Avakian, J. Ball, I. Bedlinskiy, et al.. Measurement of Deeply Virtual Compton Scattering Beam-Spin Asymmetries. Physical Review Letters, American Physical Society, 2008, 100, pp.162002. ⟨10.1103/PhysRevLett.100.162002⟩. ⟨in2p3-00193009⟩

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