## H1prelim-01-115
## Diffractive dissociation in photoproduction at HERA
Reference | N.N., to be presented at EPS 2001, Summer 2001
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Contact | Robert Roosen
Abstract | The differential cross section d sigma/d Mx^2 for the process gamma p -> X Y, with a large rapidity gap between the systems X and Y and with Y a proton or a low mass proton excitation, is analysed at three centre-of-mass energies W = 91,187 and 231 GeV. The slope parameter alpha_eff(0) obtained from a tripple Regge type parameterization with a single effective trajectory is presented as a function of Mx^2.
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