Dipole-proton $S$-matrix derived from diffractive meson electroproduction

Abstract

Through a determination of the $S$-matrix element for the scattering of a localized colour dipole on a proton, we show that saturation effects can already be sizable at HERA. The saturation scale is found to be around 1-1.5 $Ge{V}^2$ for the highest available energies and for central collisions, and is a decreasing function of the impact parameter.

Comments: 4 pages, 1 figure (in eps) talk given at XXXI International Symposium on Multiparticle Dynamics, Sep. 1-7, 2001, Datong China URL http://ismd31.ccnu.edu.cn/