| Reference |
talk presented at EPS 2001, July 2001 |
| Document |
Conference paper
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| Contact |
Wulfrin Bartel, Oliver Karschnick |
| Abstract |
The elastic photoproduction of rho mesons is studied with the H1 detector in events where a high momentum proton is measured in the forward proton spectrometer. The photon-proton centre-of-mass energy is in the range 25 GeV < W < 70 GeV, the four momentum transfer squared at the proton vertex is 0.073 GeV^2 < |t| < 0.45 GeV^2 and the fractional energy of the proton is E_p'/E_p > 0.98. The distribution of the two pion invariant mass is found to be skewed increasing with decreasing |t|. A variation with W is not observed. The total cross section for rho meson photoproduction is measured in three bins of W, as well as the slope of the differential cross section d sigma / d t ~ exp(bt). The measured slope alpha'_pom of the pomeron trajectory is compatible with a gradient alpha'_pom = 0.25 GeV^-2 extracted from fits to hadron-hadron elastic scattering cross sections. The results of an analysis of the decay angular distribution are compatible with the assumption of s-channel helicity conservation in this process. |
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