Vector mesons $ρ, ρ'$ and $ρ''$ diffractively photo- and leptoproduced

Details Vector mesons $ρ, ρ'$ and $ρ''$ diffractively photo- and leptoproduced Vector mesons $ρ, ρ'$ and $ρ''$ diffractively photo- and leptoproduced

1999-01-14

arxiv.org/abs/hep-ph/9901313v1

Fizika B8:375-382,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, LaTeX2e, 6 ps/eps figures included, to be published in Fizika B

Scientific paper

In the framework of non-perturbative QCD we calculate high-energy diffractive production of vector mesons $\rh, \rh'$ and $\rh''$ by real and virtual photons on a nucleon. The initial photon dissociates into a $q\bar{q}$-dipole and transforms into a vector meson by scattering off the nucleon which, for simplicity, is represented as quark-diquark. The relevant dipole-dipole scattering amplitude is provided by the non-perturbative model of the stochastic QCD vacuum. The wave functions result from considerations in the frame of light-front dynamics; the physical $\rh'$- and $\rh''$-mesons are assumed to be mixed states of an active 2S-excitation and some residual rest (2D- and/or hybrid state). We obtain good agreement with the experimental data and get an understanding of the markedly different $\pi^+\pi^-$-mass spectra for photoproduction and $e^+e^-$-annihilation.

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