Ultraperipheral photoproduction of vector mesons in the nuclear Coulomb field and the size of neutral vector mesons
Abstract
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.
 Publication:

arXiv eprints
 Pub Date:
 May 2003
 DOI:
 10.48550/arXiv.hepph/0305054
 arXiv:
 arXiv:hepph/0305054
 Bibcode:
 2003hep.ph....5054G
 Keywords:

 High Energy Physics  Phenomenology
 EPrint:
 NATO Sci.Ser.II 111:253, 2003