26 research outputs found
Measurement of the polarized structure functions g1, b1 and the polarized quark distributions q at HERMES
Get PDFA study of fragmentation processes in the HERMES experiment using a ring imaging Cerenkov detector
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Measurement of the polarized structure functions g1, b1 and the polarized quark distributions delta(q) at HERMES
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Polarized semi-inclusive deep-inelastic scattering on transversely and longitudinally polarized nucleons at HERMES
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Measurement of the beam-spin azimuthal asymmetry associated with deeply-virtual Compton scattering
No full textThe beam-spin asymmetry in hard electroproduction of photons has been measured. The data have been accumulated by the HERMES experiment at DESY using the HERA 27.6 GeV longitudinally polarized positron beam and an unpolarized hydrogen-gas target. The asymmetry in the azimuthal distribution of the produced photons in the angle phi relative to the lepton scattering plane was determined with respect to the helicity state of the incoming positron beam. The beam-spin analyzing power in the sin phi moment was measured to be -0.23 +/- 0.04(stat) +/- 0.03(syst) in the missing-mass range below 1.7 GeV. The observed asymmetry is attributed to the interference of the Bethe-Heitler and deeply virtual Compton scattering processes
