Shadowing in multiparton proton–deuteron collisions

B. Blok, M. Strikman
2014 European Physical Journal C: Particles and Fields  
We study the screening effect for the multiparton interactions (MPI) for proton--deuteron collisions in the kinematics where one parton belonging to the deuteron has small x_1 so the leading twist shadowing is present while the second parton (x_2) is involved in the interaction where shadowing effects are small. We find that the ratio of the shadowing and the impulse approximation terms is approximately factor of two larger for MPI than for the single parton distributions. We also calculate the
more » ... double parton antishadowing (DPA) contribution to the cross section due to the independent interactions of the partons ofthe projectile proton with two nucleons of the deuteron and find that shadowing leads to a strong reduction ofthe DPA effect.For example, for the resolution scale Q_1^2 ∼ 4 GeV^2 of the interaction with parton x_1 we find that shadowing reduces the DPA effect by ∼ 30 of interference diagrams, which correspond to the interchange ofpartonsbetween the proton and neutron, constitutes only a small correction to the shadowing contributions.
doi:10.1140/epjc/s10052-014-3038-5 fatcat:2n32r73qirdrbebe4swkje5bru