Evidence for no shrinkage in elastic photoproduction of J/Psi

Details Evidence for no shrinkage in elastic photoproduction of J/Psi Evidence for no shrinkage in elastic photoproduction of J/Psi

1997-12-24

arxiv.org/abs/hep-ph/9712519v1

Phys.Lett. B424 (1998) 191-194

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages including 2 figures

Scientific paper

10.1016/S0370-2693(98)00160-9

The differential cross section dsigma/dt of elastic photoproduction of J/Psi at different gamma p center of mass energies W are used to determine the properties of the exchanged trajectory in the reaction gamma p --> J/Psi p. In the region |t| < 1 GeV^2, the resulting trajectory is alpha(t) = (1.153 \pm 0.027) + (-0.001 \pm 0.072)t. The vanishing value of the slope of the trajectory is an experimental evidence for no shrinkage and thus for the perturbative nature of the exchange.

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