Diffractive photo-and leptoproduction of vector mesons, and

G Kulzinger, HG Dosch, HJ Pirner - The European Physical Journal C …, 1999 - Springer
G Kulzinger, HG Dosch, HJ Pirner
The European Physical Journal C-Particles and Fields, 1999Springer
We calculate diffractive photo-and leptoproduction of ρ-, ρ'-and ρ''-mesons. The incoming
photon dissociates into a q̄q-dipole which scatters on the nucleon and transforms into a
vector meson state. The scattering amplitude is calculated in non-perturbative QCD with the
model of the stochastic vacuum. Assuming that the physical ρ'-and ρ''-mesons are mixed
states of an active 2S-excitation and some residual hybrid state which cannot be produced
diffractively in lowest order QCD, we obtain good agreement with the data, especially the …
Abstract
We calculate diffractive photo- and leptoproduction of -, - and -mesons. The incoming photon dissociates into a -dipole which scatters on the nucleon and transforms into a vector meson state. The scattering amplitude is calculated in non-perturbative QCD with the model of the stochastic vacuum. Assuming that the physical - and -mesons are mixed states of an active 2S-excitation and some residual hybrid state which cannot be produced diffractively in lowest order QCD, we obtain good agreement with the data, especially the markedly different spectrum in the -invariant mass for photoproduction and -annihilation.
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