Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2000-10-31
Int.J.Mod.Phys. A16S1A (2001) 187-190
Physics
High Energy Physics
High Energy Physics - Experiment
Contributed to the proceedings of DPF2000, the meeting of the Division of Particles and Fields of the American Physical Societ
Scientific paper
We discuss recent preliminary results on the diffractive photoproduction of {\rhoz}, $\phi$, and {\jpsi} mesons at high momentum transfer reported by the ZEUS collaboration at HERA. A special-purpose calorimeter served to tag the quasi-real photons ($\qsq<0.01 \gevsq$) in the process $\gamma + p \to {\rm VM}+ Y$, where $Y$ represents a dissociated state of the proton. The resulting range in photon-proton center-of-mass energy extends from 80 to 120 \gev. The differential cross sections $\frac{\D\sigma}{\D t}$ were obtained in the region ${\abst}>1.2 \gevsq$, where $t$ denotes the squared momentum transfer to the proton. The measurements provide good sensitivity to the observed power-law dependence $\frac{\D\sigma}{\D t} \propto {(-t)}^{-n}$. Over the region in momentum transfer covered by the data, the power is found to be approximately $n\simeq 3$ for {\rhoz} and $\phi$ photoproduction, and approximately $n\simeq 2$ for {\jpsi} photoproduction.
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