Abstract
Differential cross sections for the process γp→XY are measured as a function of the invariant mass MX of the system produced at the photon vertex. Results are presented in two fixed ranges of the mass MY of the system Y, the lower of which, MY<1.6 GeV, is heavily dominated by the single photon dissociation process γp→Xp. Both the centre of mass energy W and the MX2 dependence of H1 single dissociation data and those from a fixed target experiment may simultaneously be described in a triple-Regge model. Diffraction is found to dominate at low MX, though a sizable subleading contribution is present at larger masses. The pomeron intercept is found to be αP(0)=1.068±0.016 (stat.)±0.022 (syst.)±0.041 (model), in good agreement with values obtained from total and elastic hadronic and photoproduction cross sections. The diffractive contribution to the process γp→Xp with MX2/W2<0.05 is measured to be 22.2±0.6 (stat.)±2.6 (syst.)±1.7 (model)% of the total γp cross section at 〈W〉=187 GeV.
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