Drell-Yan process at forward rapidity at the LHC

We analyze the Drell-Yan lepton pair production at forward rapidity at the Large Hadron Collider. Using the dipole framework for the computation of the cross section we find a significant suppression in comparison to the collinear factorization formula due to saturation effects in the dipole cross section. We develop a twist expansion in powers of Q_s^2/M^2 where Q_s is the saturation scale and M the invariant mass of the produced lepton pair. For the nominal LHC energy the leading twist description is sufficient down to masses of 6 GeV. Below that value the higher twist terms give a significant contribution.Comment: 13 pages, 7 figure

Geometric scaling for the total gamma^* p cross section in the low x region

We observe that the saturation model of deep inelastic scattering, which successfully describes inclusive and diffractive data at small x, predicts a geometric scaling of the total gamma^* p cross section in the region of small Bjorken variable x. The geometric scaling in this case means that the cross section is a function of only one dimensionless variable tau = Q^2 R_0^2(x), where the function R_0(x) (called saturation radius) decreases with decreasing x. We show that the experimental data from HERA in the region x<0.01 confirm the expectations of this scaling over a very broad region of Q^2. We suggest that the geometric scaling is more general than the saturation model.Comment: 12 pages, 4 figures, LaTeX, revised version to appear in journal. 1 new figure, several new references added, extended discussion on saturation radiu

Correspondence between images of terrorists and preferred approaches to counterterrorism: the moderating role of ideological orientations.

Two studies examined the moderating effects of right wing authoritarianism and social dominance orientation on the relationship between terrorist images (soldiers vs. criminals) and preference for counterterrorist actions (military aggression vs. criminal prosecution). Study 1 indicated that the perception of Al-Qaeda terrorists as soldiers was related to preference for military counterterrorism, especially among people high in social dominance orientation. The relationship between the perception of Al-Qaeda terrorists as criminals and preference for the criminal prosecution of terrorists was strengthened among those high in right wing authoritarianism. Study 2 showed that when terrorists were framed as soldiers, social dominance orientation was related to support for military counterterrorism. When terrorists were framed as criminals, only people who endorsed high levels of right wing authoritarianism supported criminal prosecution of terrorists. Social dominance orientation was related to opposition towards military counterterrorism when terrorists were not perceived as soldiers or framed as criminals. It was also related to opposition towards criminal prosecution of terrorists when terrorists were framed as criminals. The findings suggest that different terrorist images are related to preference for counterterrorism that corresponds with the content of the images and individuals’ chronic ideological orientations

QCD evolution and skewedness effects in color dipole description of DVCS

We show the role played by QCD evolution and skewedness effects in the DVCS cross section at large $Q^2$ within the color dipole description of the process at photon level. The dipole cross section is given by the saturation model, which can be improved by DGLAP evolution at high photon virtualities. We investigate both possibilities as well as the off-forward effect through a simple phenomenological parametrisation. The results are compared to the recent ZEUS DVCS data.Comment: LaTeX, 6 pages, 5 Figs. Vers 2: Minor modifications. Accepted by EPJ

Constraining the double gluon distribution by the single gluon distribution

We show how to consistently construct initial conditions for the QCD evolution equations for double parton distribution functions in the pure gluon case. We use to momentum sum rule for this purpose and a specific form of the known single gluon distribution function in the MSTW parameterization. The resulting double gluon distribution satisfies exactly the momentum sum rule and is parameter free. We also study numerically its evolution with a hard scale and show the approximate factorization into product of two single gluon distributions at small values of x, whereas at large values of x the factorization is always violated in agreement with the sum rule.Comment: 8 pages, 2 figure