Abstract.
We calculate diffractive photo- and leptoproduction of \(\rho\)-, \(\rho'\)- and \(\rho''\)-mesons. The incoming photon dissociates into a \(q\bar{q}\)-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 \(\rho'\)- and \(\rho''\)-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 \(\pi^+\pi^-\)-invariant mass for photoproduction and \(e^+e^-\)-annihilation.
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Received: 16 June 1998 / Published online: 22 October 1998
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Kulzinger, G., Dosch, H. & Pirner, H. Diffractive photo- and leptoproduction of vector mesons \(\rho\), \(\rho'\) and \(\rho''\) . Eur. Phys. J. C 7, 73–86 (1999). https://doi.org/10.1007/PL00021665
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DOI: https://doi.org/10.1007/PL00021665