2018 Impact factor 4.843
Particles and Fields
Eur. Phys. J. C 2, 237-246

Measurement of the t distribution
in diffractive photoproduction at HERA

The ZEUS Collaboration, J. Breitweg et al.

Argonne National Laboratory, Argonne, IL, USA

Received: 3 December 1997

Abstract
Photon diffractive dissociation, $\gamma p \rightarrow Xp$, has been studied at HERA with the ZEUS detector using ep interactions where the virtuality Q2 of the exchanged photon is smaller than 0.02 GeV2. The squared four-momentum t exchanged at the proton vertex was determined in the range 0.073<|t|<0.40 GeV2 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<MX<32 GeV, the t distribution has an exponential shape, $dN/d\vert t\vert \propto \exp{(-b\vert t\vert)}$, with a slope parameter $b=6.8 \pm 0.9$ (stat.) +1.2-1.1 (syst.) GeV-2.


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