Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-08-27
Nucl.Phys.Proc.Suppl. 74 (1999) 91-95
Physics
High Energy Physics
High Energy Physics - Phenomenology
Talk given in Montpellier, QCD Euroconference 98, to be published in the proceedings Nucl.Phys. B (Proc.Suppl.). 5 pages, LaTe
Scientific paper
10.1016/S0920-5632(99)00141-3
We present a non-perturbative QCD calculation of high-energy diffractive photo- and leptoproduction of vector mesons $\rho$, $\rho'$ and $\rho''$ on a nucleon. The initial photon splits up in a $q\bar{q}$-dipole and transforms into a vector meson by scattering on the quark-diquark nucleon. The dipole-dipole scattering amplitude is provided by the non-perturbative model of the stochastic QCD vacuum, the wave functions result from considerations on the light-cone. We assume the physical $\rho'$- and $\rho''$-states to be mixed states of an active 2S-excitation and a rest whose coupling to the photon is suppressed. We obtain good agreement with the experimental data and get an understanding of the markedly different spectrum in the $\pi^+\pi^-$-invariant mass for photoproduction and $e^+e^-$-annihilation.
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