Measurement of the total photon proton cross section and its decomposition at 200 GeV centre of mass energy

摘要

We present a new measurement of the total photoproduction cross section performed with the H1 detector at HERA. For an average centre of mass energy of 200 GeV a value of (sigma)(sub tot)(sup (gamma)p)=165(+-)2(+-)11 (mu)b has been obtained. A detailed analysis of the data in adequate kinematic regions enabled a decomposition of the total cross section in its elastic, single diffractive dissociation and remaining non-diffractive parts, based on safe assumptions on the double diffractive dissociation contribution. (orig.)