HERA, the first electron-proton collider, has been delivering luminosity since 1992. It is the
natural extension of an impressive series of fixed-target lepton-nucleon scattering …

The present knowledge of the structure of the photon is presented with emphasis on
measurements of the photon structure obtained from deep inelastic electron–photon …

Photon-photon collisions are investigated in the framework of the two-component dual
parton model. The model contains contributions from direct, resolved soft, and resolved hard …

Photon proton cross sections for elastic light vector meson production, σ el νp, inelastic
diffractive production, σ nd νp, non-diffractive production, σ d νp, as well as the total cross …

We present a measurement of the longitudinal spin asymmetry A|| in photoproduction of
pairs of hadrons with high transverse momentum p T. Data were accumulated by the …

We report a study of electron proton collisions at very low Q2, corresponding to virtual
photoproduction at centre of mass energies in the range 100–295 GeV. The distribution in …

The contribution of resolved photons to the photoproduction cross section of direct photons
is reexamined. Higher order, O (α 2 α s), QCD corrections to this contribution are calculated …

Inclusive transverse momentum spectra of charged particles in photoproduction events in
the laboratory pseudorapidity range− 1.2< η< 1.4 have been measured up to p T= 8 GeV …

Cross sections are presented for the inclusive production of charged particles measured in
electron-proton collisions at low Q2 with the H1 detector at HERA. The transverse …

The production of charged hadrons and \rmK^0_\rmS mesons in the collisions of quasi-real
photons has been measured using the OPAL detector at LEP. The data were taken at e^+e …