Measurement of the t Distribution in Diffractive Photoproduction at HERA

Abstract

Photon diffractive dissociation, $\gamma p\to Xp$, has been studied at HERA with the ZEUS detector using $ep$ interactions where the virtuality $Q^2$ of the exchanged photon is smaller than 0.02 GeV${}^2$. The squared four-momentum $t$ exchanged at the proton vertex was determined in the range $0.073<|t|<0.40$ GeV${}^2$ by measuring the scattered proton in the ZEUS Leading Proton Spectrometer. In the photon-proton centre-of-mass energy interval $176<W<225$ GeV and for masses of the dissociated photon system $4<M_X<32$ GeV, the $t$ distribution has an exponential shape, $dN/d|t|\propto \exp (-b|t|)$, with a slope parameter $b=6.8\pm 0.9$~(stat.)~${}_{-1.1}^{+1.2}$~(syst.)~GeV${}^{-2}$.

arXiv comment13 pages including 2 figures

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