6 research outputs found

    A Measurement of sigma(t) (gamma p) at s**(1/2) = 210-GeV

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    A measurement of σtot(γp) at √s = 210 GeV

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    The total photoproduction cross section is determined from a measurement of electroproduction with the ZEUS detector at HERA. The Q2 values of the virtual photons are in the range 10-7 < Q2 < 2 × 10-2 GeV2. The γp total cross section in the γp centre of mass energy range 186-233 GeV is 154 ± 16 (stat.) ± 32 (syst.) μb

    A Measurement of sigma(tot) (gamma p) at s**(1/2) = 210-GeV

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    Observation of hard scattering in photoproduction at HERA

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    We report a study of electron proton collisions at very low Q<sup>2</sup>, corresponding to virtual photoproduction at centre of mass energies in the range 100–295 GeV. The distribution in transverse energy of the observed hadrons is much harder than can be explained by soft processes. Some of the events show back-to-back two-jet production at the rate and with the characteristics expected from hard two-body scattering. A subset of the two-jet events have energy in the electron direction consistent with that expected from the photon remnant in resolved photon processes

    Initial study of deep inelastic scattering with ZEUS at HERA

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    Results are presented on neutral current, deep inelastic scattering measured in collisions of 26.7 GeV electrons and 820 GeV protons. The events typically populate a range in Q2 from 10 to 100 GeV2. The values of x extend down to x ∼ 10−4 which is two orders of magnitude lower than previously measured at such Q2 values in fixed target experiments. The measured cross sections are in accord with the extrapolations of current parametrisations of parton distributions
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