Measurement of the transverse target-spin asymmetry associated with deeply virtual Compton scattering on the proton
Ye, Zhenyu
Original · EN
Measurements of deeply virtual Compton scattering (DVCS) made at HERMES using 27.6 GeV e± beams and various internal polarized or unpolarized gaseous targets are discussed. Results are reported on the transverse target-spin asymmetry (TTSA) associated with DVCS, extracted from data accumulated in 2002-2004 with the e+ beam on a transversely polarized hydrogen target. TTSA amplitudes leading in twist and αₛ are given as a function of -t, xB and Q² in the kinematic range |t|<0.7 GeV², 0.03<xB<0.35 and 1<Q²<10 GeV². Theoretical predictions based on a phenomenological model of generalized parton distributions (GPDs) agree with the experimental results. With additional statistics accumulated in 2005, one may constrain the u-quark total angular momentum in the nucleon within this model.
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