Diffractive excitation in DIS andppcollisions

Diffractive Excitation in DIS and pp Collisions

We have in earlier papers presented an extension of Mueller’s dipole cascade model, which includes subleading effects from energy conservation and running coupling as well as colour suppressed effects from pomeron loops via a “dipole swing”. The model was applied to describe the total cross sections in pp and γ∗p collisions. In this paper we present a number of improvements of the model, in par...

- Production in Diffractive DIS

We calculate the cross section for q ¯ qg-production in diffractive DIS with finite fermion masses and zero momentum transfer. The calculation is done in the leading log(1/x P) approximation and is valid for the region of high diffractive masses (small β). We apply our cross section formula to diffractive charm production at HERA: in a Monte-Carlo-Simulation of diffractive D * ± meson productio...

Unified Picture of Dis and Diffractive Dis

The QCD dipole picture allows to build an unified theoretical description -based on BFKL dynamicsof the total and diffractive nucleon structure functions. We use a four parameter fit to describe the 1994 H1 proton structure function F2 data in the low x, moderate Q2 range. Without any additional parameter, the gluon density and the longitudinal structure functions are predicted. The diffractive...

Saturation and Diffractive DIS

Around 10% of deep inelastic scattering (DIS) events observed at HERA at small value of the Bjorken variable x are diffractive events [1, 2], when the incoming proton stays intact losing only a small fraction xIP of its initial momentum. A large rapidity gap is formed between the scattered proton (or its low mass excitation) and the diffractive system. The ratio of diffractive to total DIS cros...

Diffractive Jet Production in Dis