The proton dipole cross section σd is a universal quantity in singly dissociative diffractive γ p processes. It is simply the total cross section for scattering a qq̄ pair of a given size and energy in the photonic fluctuation off the proton target. We make use of a parameterisation used to extract σd from a fit to electroproduction and photoproduction γ p total cross-section data [1] to predict...

I develop and test the theoretical predictions that when investor overreaction to marketwide news is larger, firm valuations in the cross section become more dispersed and stocks earn lower expected returns. Consistent with these predictions, measures of cross-sectional dispersion of firm valuations are negatively related to subsequent market and portfolio excess returns, especially for sets of...

We report on a successful attempt to extract the cross-section for the high-energy scattering of colour dipoles of fixed transverse size off protons using electroproduction and photoproduction total crosssection data, subject to the constraint provided by the ratio of the overall photon dissociation cross-section to the total cross-section. 13.60.Hb, 25.20.Lj, 25.30.Rw, 13.38.-t, 24.85.+p, 12.4...

HERA, the first electron-proton collider, has been delivering luminosity since 1992. It is the natural extension of an impressive series of fixed-target leptonnucleon scattering experiments. The increase of a factor ten in center-of-mass energy over that available for fixed-target experiments has allowed the discovery of several important results, such as the large number of slow partons in the...