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We present recently-published HERMES asymmetry measurements for the hard exclusive leptoproduction of real photons from a longitudinally polarised hydrogen target using a 27.57GeV longitudinally polarised HERA positron beam. These asymmetries arise from the deeply virtual Compton scattering and Bethe-Heitler processes. Two asymmetries are simultaneously extracted in the azimuthal distribution of produced real photons about the direction of the exchanged photon: AUL with respect to the polarisation of the target and ALL with respect to the product of the beam and target polarisations. The results are presented in comparison with predictions from a generalised parton distribution model. The sinφ and cos(0φ) modulations of the AUL and ALL respectively, are observed to be compatible with the predictions from this model. An unexpected sin(2φ) amplitude is also observed for AUL.

Target single- and double-spin asymmetries in DVCS off a longitudinal polarized hydrogen target at HERMES