Beyond The Colour-Singlet Model For Inelastic J/ψPhotoproduction

Details Beyond The Colour-Singlet Model For Inelastic J/ψPhotoproduction Beyond The Colour-Singlet Model For Inelastic J/ψPhotoproduction

1995-11-17

arxiv.org/abs/hep-ph/9511360v1

Phys. Lett. B382 (1996) 189

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, latex, no figures

Scientific paper

10.1016/0370-2693(96)00588-6

Bound-state corrections to $J/\psi$ production from almost real photons are calculated in the colour-singlet model. A systematic, gauge-invariant, theory of hard quarkonium processes is used upto $O(v^2)$, where $v$ is the relative velocity of the quarks. The internal structure of the meson is characterised by two parameters, $\epsilon_B/M$ and $\nabla^2 \phi(0)/M^2 \phi(0)$, in addition to the usual wavefunction at the origin $\phi(0)$. These parameters are constrained to be consistent with measured leptonic decay of the $J/\psi$ and hadronic and radiative decays of $\eta_c$.

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