Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-05-06
NATO Science Series,111:253, 2003
Physics
High Energy Physics
High Energy Physics - Phenomenology
Scientific paper
We point out a significance of ultraperipheral photoproduction of vector mesons in the Coulomb field of nuclei as a means of measuring the radius of the neutral vector meson. This new contribution to the production amplitude is very small compared to the conventional diffractive amplitude, but because of large impact parameters inherent to the ultraperipheral Coulomb mechanism its impact on the diffraction slope is substantial. We predict appreciable and strongly energy dependent increase of the diffraction slope towards very small momentum transfer.The magnitude of the effect is proportional to the mean radius squared of the vector meson and is within the reach of high precision photoproduction experiments, which gives a unique experimental handle on the size of vector mesons.
Gevorkyan S. R.
Ivanov Igor P.
Nikolaev Nikolai N.
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