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Polarisation asymmetries are measured for the hard exclusive leptoproduction of real photons from a longitudinally polarised hydrogen target. These asymmetries arise from the deeply virtual Compton scattering and Bethe-Heitler processes. From the data are extracted two asymmetries in the azimuthal distribution of produced real photons about the direction of the exchanged virtual photon: $$ {\mathcal{A}_{\text{UL}}}...
Evidence for a positive longitudinal double-spin asymmetry <A 1ρ >=0.24+/-0.11 stat +/-0.02 syst in the cross section for exclusive diffractive ρ 0 (770) vector-meson production in polarised lepton-proton scattering was observed by the HERMES experiment. The longitudinally polarised 27.56<space>GeV HERA positron beam was...
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