https://doi.org/10.1140/epjc/s10052-014-3038-5
Regular Article - Theoretical Physics
Shadowing in multiparton proton–deuteron collisions
1
Department of Physics, Technion-Israel Institute of Technology, 32000, Haifa, Israel
2
Physics Department, Penn State University, University Park, PA, USA
* e-mail: blok@physics.technion.ac.il
Received:
26
February
2014
Accepted:
22
August
2014
Published online:
6
September
2014
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 
, so the leading twist shadowing is present, while the second parton (
) 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 
of the interaction with parton we find that shadowing reduces the DPA effect by 
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.
© SIF and Springer-Verlag Berlin Heidelberg, 2014
