Predictions for the forward cone in diffractive deep inelastic scattering

Abstract

We calculate the diffraction slope B D for diffractive DIS. We find a coun-

Dissociation of virtual photons in events with a leading proton at HERA

“…5b together with the previous ZEUS measurements in photoproduction [13] and in DIS [12], show that b is independent of Q 2 within the errors. This behaviour is expected in a QCD-based model [49].…”

“…In the dipole model, in which the virtual photon fluctuates into qq or qqg systems, the qqg contribution dominates for β < 0.2-0.3 [3]. Different t dependences for the qq and qqg regions are expected [49], with slopes higher by up to 3 GeV −2 at high β in the diffractive peak. In addition, in the qqg region, the slope b is expected to decrease logarithmically with x P : b = b P 0 − 2α P ln x P , the so-called shrinkage of the diffractive cone [3].…”

Diffraction driven steep rise of spin structure function gLT=g1+g2 at small x and DIS sum rules

“…GeV 2 which can be affected by soft dynamics. Furthermore, the overall result for unitarity driven g LT is proportional to ∆ 2 , which is the soft quantity controlled by the size of the target proton and large transverse size of diffractive qq states [24]. All this sensitivity to soft input notwithstanding, our unitarity driven g (U )…”

Evolution of high-mass diffraction from the light quark valence component of the Pomeron

“…The t-integrated diffractive SF is dimensionless, but the modulation of the SF by the β-dependent diffraction slope [9] can spoil the evolution properties, and herebelow we focus on forward diffraction, t = 0. )…”

“…(being differential in t, the so-defined diffractive SF is dimensionfull, and σ IP (x IP , β, r) has a dimension [mb] 2 , but that does not affect its evolution properties. The t-integrated diffractive SF is dimensionless, but the modulation of the SF by the β-dependent diffraction slope [9] can spoil the evolution properties, and herebelow we focus on forward diffraction, t = 0. )…”