Elastic and proton–dissociative photoproduction of \documentclass[12pt]{minimal}
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\begin{document}$\rho^0$\end{document}, \documentclass[12pt]{minimal}
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\begin{document}$\phi$\end{document} and \documentclass[12pt]{minimal}
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\begin{document}$J/\psi$\end{document} vector mesons (\documentclass[12pt]{minimal}
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\begin{document}$\gamma p\rightarrow Vp$\end{document}, \documentclass[12pt]{minimal}
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\begin{document}$\gamma p\rightarrow VN$\end{document}, respectively) have been measured in \documentclass[12pt]{minimal}
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\begin{document}$e^+p$\end{document} interactions at HERA up to \documentclass[12pt]{minimal}
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\begin{document}$-t=3$\end{document} GeV\documentclass[12pt]{minimal}
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\begin{document}$^2$\end{document}, where t is the four-momentum transfer squared at the photon–vector–meson vertex. The analysis is based on a data sample in which photoproduction reactions were tagged by detection of the scattered positron in a special-purpose calorimeter. This limits the photon virtuality, \documentclass[12pt]{minimal}
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\begin{document}$Q^2$\end{document}, to values less than 0.01 GeV\documentclass[12pt]{minimal}
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\begin{document}$^2$\end{document}, and selects a \documentclass[12pt]{minimal}
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\begin{document}$\gamma p$\end{document} average center-of-mass energy of \documentclass[12pt]{minimal}
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\begin{document}$\langle W\rangle$\end{document} = 94 GeV. Results for the differential cross sections, \documentclass[12pt]{minimal}
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\begin{document}$\mbox{d}\sigma/\mbox{d}t$\end{document}, for \documentclass[12pt]{minimal}
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\begin{document}$\rho^0$\end{document}, \documentclass[12pt]{minimal}
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\begin{document}$\phi$\end{document} and \documentclass[12pt]{minimal}
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\begin{document}$J/\psi$\end{document} mesons are presented and compared to the results of recent QCD calculations. Results are also presented for the t-dependence of the pion-pair invariant-mass distribution in the \documentclass[12pt]{minimal}
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\begin{document}$\rho^0$\end{document} mass region and of the spin-density matrix elements determined from the decay-angle distributions. The Pomeron trajectory has been derived from measurements of the W dependence of the elastic differential cross sections \documentclass[12pt]{minimal}
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\begin{document}$\mbox{d}\sigma/\mbox{d}t$\end{document} for both \documentclass[12pt]{minimal}
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\begin{document}$\rho^0$\end{document} and \documentclass[12pt]{minimal}
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\begin{document}$\phi$\end{document} mesons.
