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The energy dependence of the photon–proton total cross section, σtotγp, was determined from e+p scattering data collected with the ZEUS detector at HERA at three values of the center-of-mass energy, W, of the γp system in the range 194<W<296 GeV. This is the first determination of the W dependence of σtotγp from a single experiment at high W. Parameterizing σtotγp∝W2ϵ, ϵ=0.111±0.009(stat.)±0...
Three- and four-jet final states have been measured in photoproduction at HERA using the ZEUS detector with an integrated luminosity of 121 pb−1. The results are presented for jets with transverse energy ETjet>6 GeV and pseudorapidity |ηjet|<2.4, in the kinematic region given by the virtuality of the photon Q2<1 GeV2 and the inelasticity 0.2⩽y⩽0.85 and in two mass regions defined as 25⩽Mnj<50 GeV...
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