Acta Physica Polonica B

Vol. 33, No. 11, November 2002, page 3535


Diffractive Photoproduction of \psi (2S) Mesons at HERA

Duncan Brown

The diffractive photoproduction of the \psi (2S) meson is measured using a data set collected between 1996 and 2000 by the H1 detector at HERA corresponding to a luminosity of 77 pb-1. The ratio of the integrated diffractive cross sections for \psi (2S) and J/\psi production is presented as a function of the photon--proton centre-of-mass energy W\gamma p. The dependences of elastic and proton-dissociative \psi (2S) production on the four-momentum transfer squared t at the proton vertex are also presented. The results are compared to theoretical predictions calculated within the colour dipole framework.

PACS numbers: 13.60.Le, 14.40.Lb


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