Measurement of diffractive photoproduction of vector mesons at large momentum transfer at HERA

Details Measurement of diffractive photoproduction of vector mesons at large momentum transfer at HERA Measurement of diffractive photoproduction of vector mesons at large momentum transfer at HERA

1999-10-19

arxiv.org/abs/hep-ex/9910038v1

Eur.Phys.J.C14:213-238,2000

Physics

High Energy Physics

High Energy Physics - Experiment

52 pages, including 24 figures and 18 tables

Scientific paper

10.1007/s100520050748

Elastic and proton-dissociative photoproduction of $\rho^0$, $\phi$ and $J/\psi$ vector mesons ($\gamma p\to Vp$, $\gamma p\to VN$, respectively) have been measured in e^+p interactions at HERA up to -t=3 GeV$^2$, 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, Q^2, to values less than 0.01 GeV$^2$, and selects a $\gamma p$ average center-of-mass energy of = 94 GeV. Results for the differential cross sections, d$\sigma$/d$t$, for $\rho^0$, $\phi$ and $J/\psi$ 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 $\rho^0$ 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 d$\sigma$/d$t$ for both $\rho^0$ and $\phi$ mesons.

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