Photoproduction on Hydrogen ofρ0Mesons between Threshold and 6 BeV
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Abstract
Data are presented on the details of the interaction $\ensuremath{\gamma}+p\ensuremath{\rightarrow}p+{\ensuremath{\rho}}^{0}$ observed in a 12-in. hydrogen bubble chamber exposed to a bremsstrahlung photon beam of 6-BeV maximum energy at the Cambridge Electron Accelerator. The energy dependence of the cross sections, the production angular distributions, and the decay angular distributions of the ${\ensuremath{\rho}}^{0}'\mathrm{s}$ are compared with the predictions of the one-pion-exchange (OPE) mechanism and with a diffraction or multiperipheral model proposed by Berman and Drell. These data, as well as a comparison with ${\ensuremath{\omega}}^{0}$ and with ${\ensuremath{\rho}}^{0}+{N}^{*}(1238)$ production, reject the OPE model and favor a diffraction mechanism.
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