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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...
Cross section ratios for deep-inelastic scattering from 14 N and 3 He with respect to 2 H have been measured by the HERMES experiment at DESY using a 27.5 GeV positron beam. The data cover a range in the Bjorken scaling variable x between 0.013 and 0.65, while the negative squared four-momentum transfer Q 2 varies from 0.5 to 15 GeV 2 . The data are compared...
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