Measurement of deeply virtual compton scattering beam-spin asymmetries.
The beam-spin asymmetries in the hard exclusive electroproduction of photons on the proton (e p-->epgamma) 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, Q2 from 1 to 4.8 GeV2, -t from 0.09 to 1.8 GeV2), the azimuthal dependence of the asymmetries is compatible with expectations from leading-twist dominance, A approximately a sinphi/(1+c cosphi). This extensive set of data can thus be used to constrain significantly the generalized parton distributions of the nucleon in the valence quark sector.
CEA-Saclay, Service de Physique Nucléaire, 91191 Gif-sur-Yvette, France.
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Girod
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Niyazov
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Avakian
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Ball
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Bedlinskiy
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Elouadrhiri
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Garçon
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Guidal
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Joo
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Kubarovsky
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Kuleshov
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MacCormick
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Niccolai
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Pogorelko
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Sabatié
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Stepanyan
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Stoler
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Ungaro
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Zhao
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Amaryan
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Ambrozewicz
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Asryan
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Bagdasaryan
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Baillie
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Batourine
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Battaglieri
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Bellis
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Berman
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Biselli
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Blaszczyk
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Bouchigny
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Boiarinov
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Bradford
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Brooks
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Bültmann
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Butuceanu
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Chen
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Cheng
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Fedotov
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Funsten
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Salamanca
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