Color dipole phenomenology of diffractive electroproduction of light vector mesons at HERA

1996/05/06 by J. Nemchik, N. N. Nikolaev, E. Predazzi +1 · 1 citation
Physics and Astronomy · #hep-ph

paper · pdf

published as Z.Phys. C75 (1997) 71-87 · 39 pages LaTeX, 18 figures in bitmapped postscript, uuencoded. The original postscript figures are available at ftp://ftp.to.infn.it/pub/giunti/jan/

arxiv created 1996/05/06 · arxiv updated 2009/11/30

Abstract

We develop the color dipole phenomenology of diffractive photo- and electroproduction γ^* N→ V(V') N of light vector mesons (V(1S) = ϕ⁰, ω⁰, ρ⁰) and their radial excitations (V'(2S) = ϕ', ω', ρ'). The node of the radial wave function of the 2S states in conjunction with the energy dependence of the color dipole cross section is shown to lead to a strikingly different Q² and ν dependence of diffractive production of the V(1S) and V'(2S) vector mesons. We discuss the restoration of flavor symmetry and universality properties of production of different vector mesons as a function of Q²+m_V². The color dipole model predictions for the ρ⁰ and ϕ⁰ production are in good agreement with the experimental data from the EMC, NMC, ZEUS and H1 collaborations. We present the first direct evaluation of the dipole cross section from these data.

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