The QCD description of diffractive rho meson electroproduction

Details The QCD description of diffractive rho meson electroproduction The QCD description of diffractive rho meson electroproduction

1996-09-24

arxiv.org/abs/hep-ph/9609448v1

Phys.Rev. D55 (1997) 4329-4337

Physics

High Energy Physics

High Energy Physics - Phenomenology

19 pages, LaTeX, 6 Postscript figures. The complete paper, including figures, is also available via anonymous ftp at ftp://c

Scientific paper

10.1103/PhysRevD.55.4329

We critically review the QCD predictions for the cross sections sigma_L and sigma_T for diffractive rho meson electroproduction in longitudinally and transversely polarised states in the HERA energy region. We show that both perturbative and non-perturbative approaches which involve convolution with the rho meson wave function predict values of sigma_T which fall-off too quickly with increasing Q^2, in comparison with the data. We present a perturbative QCD model based on the open production of light qqbar pairs and parton-hadron duality, which describes all features of the data for rho electroproduction at high Q^2 and, in particular, predicts a satisfactory Q^2 behaviour of sigma_L/sigma_T. We find that precise measurements of the latter can give valuable information on the Q^2 behaviour of the gluon distribution at small x.

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