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- Title
Shadowing in multiparton proton-deuteron collisions.
- Authors
Blok, B.; Strikman, M.
- Abstract
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 in the kinematics where shadowing effects are small. We find that the ratio of the shadowing and the impulse approximation terms is approximately a factor of 2 larger for MPI than for the single parton distributions. We also calculate the double parton antishadowing (DPA) contribution to the cross section due to the independent interactions of the partons of the projectile proton with two nucleons of the deuteron and find that shadowing leads to a strong reduction of the DPA effect. For example, for the resolution scale $$Q_1^2 \sim 4$$ $$\text{ GeV }^2$$ of the interaction with parton $$x_1$$ we find that shadowing reduces the DPA effect by $$\sim $$ 30 %. It is argued that in the discussed kinematics the contribution of the interference diagrams, which correspond to the interchange of partons between the proton and neutron, constitutes only a small correction to the shadowing contributions.
- Subjects
PROTON-deuteron interactions; ATOMIC collisions; PARTONS; PARTICLE kinematics; SHADOWING theorem (Mathematics); IMPULSE (Physics); QUANTUM interference
- Publication
European Physical Journal C -- Particles & Fields, 2014, Vol 74, Issue 9, p1
- ISSN
1434-6044
- Publication type
Article
- DOI
10.1140/epjc/s10052-014-3038-5