Inclusive transverse momentum distributions of charged particles in diffractive and non-diffractive photoproduction at HERAстатья
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Аннотация:Inclusive transverse momentum spectra of charged particles in photoproduction events in the laboratory pseudorapidity range −1.2<η<1.4 have been measured up top T =8 GeV usign the ZEUS detector. Diffractive and non-diffractive reactions have been selected with an average γp centre of mass (c.m.) energy of 〈W〉=180 GeV. For diffractive reactions, thep T spectra of the photon dissociation events have been measured in two intervals of the dissociated photon mass with mean values 〈M X 〉=5 GeV and 10 GeV. The inclusive transverse momentum spectra fall exponentially in the lowp T region. The non-diffractive data show a pronounced highp T tail departing from the exponential shape. Thep T distributions are compared to lower energy photoproduction data and to hadron-hadron collisions at a similar c.m. energy. The data are also compared to the results of a next-to-leading order QCD calculation.