Speaker
Description
Double parton scattering (DPS) is the phenomenon in which, during a nucleon-nucleon scattering, two partons from each nucleon undergo two distinct hard interactions.
The cross section resulting from DPS interactions is normally power-suppressed with respect to the traditional single parton scattering (SPS) cross section. However, the two contributions can be similar in size in some circumstances, for example in processes that are highly suppressed in SPS like same-sign W-boson production, or when studying jet emissions in particular phase-space sectors. Moreover, the study of DPS is closely related to the three-dimensional structure of nucleons.
In this talk we focus on the derivation of the DPS cross section formula and the relevant factorization theorems, both in collinear and TMD factorization schemes. We will also introduce the double parton distributions (DPDs), which are the DPS analog of PDFs, and the subtraction formalism that is necessary to combine SPS and DPS calculations.