Diffractive photoproduction of ρ mesons with large momentum transfer at HERA
Physics Letters B2006Vol. 638(5-6), pp. 422–431
Citations Over TimeTop 10% of 2006 papers
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Abstract
The diffractive photoproduction of mesons, ep eY , with large momentum transfer squared at the proton vertex, |t|, is studied with the H1 detector at HERA using an integrated luminosity of 20.1 pb -1 . The photon-proton centre of mass energy spans the range 75 < W < 95 GeV, the photon virtuality is restricted to Q 2 < 0.01 GeV 2 and the mass M Y of the proton remnant is below 5 GeV. The t dependence of the cross section is measured for the range 1.5 < |t| < 10.0 GeV 2 and is well described by a power law, d/d|t| |t| -n . The spin density matrix elements, which provide information on the helicity structure of the interaction, are extracted using measurements of angular distributions of the decay products. The data indicate a violation of s-channel helicity conservation, with contributions from both single and double helicity-flip being observed. The results are compared to the predictions of perturbative QCD models.
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