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The HERA electron-proton storage ring at D ESY, Hamburg, provided a unique laboratory for the collection of data in deep-inelastic charged lepton -proton scattering at a center-of-mass energy of about 7 GeV for the fixed-target experiment H ERMES and at 318 GeV for the collider experiments ZEUS and H1. HERA could be operated with both electrons and positrons. The ability of the lepton beam to polarize itself was exploited. Data taken with the HERMES spectrometer on unpolarized and transversely polarized gaseous targets are presented. Two examples involving interference processes are chosen that are sensitive to the beam charge: the measurement of azimuthal asymmtries in deeply-virtual COMPTON scattering and the search for a two-photon exchange signal at HERMES.

Positrons and Electrons at HERA and HERMES