Scanning the BFKL pomeron in elastic production of vector mesons at HERA

Abstract

Elastic production of vector mesons ${\gamma }^{\ast }N\to VN$ is the pomeron-exchange dominated diffractive reaction with much potential of probing the BFKL pomeron. The BFKL pomeron can conveniently be described in terms of the dipole cross section which is a solution of the generalized BFKL equation. In this paper we discuss, how the energy and $Q^2$ dependence of elastic production of vector mesons at HERA will allow scanning the dipole cross section as a function of dipole size $r$. We show that determinaton of the intercept of the BFKL pomeron requires measuring the ${\rho }^0$ and $J/\Psi$ production at $Q^2\sim (100-200)Ge{V}^2$ and/or the quasireal photoproduction of the ${\rm Y}$. We present predictions for the effective intercept in the kinematic range of the forthcoming HERA experiments, which can shed much light on the nonperturbative component of the pomeron.

15 pages, $ 6 figures (to be requested)

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