Fresh look at double parton scattering

Abstract

A revised formula for the inclusive cross section of a double parton scattering process in a hadron collision is suggested basing on the modified collinear two-parton distributions extracted from deep inelastic scattering. The possible phenomenological issues are discussed.

W + W − pair production in proton-proton collisions: small missing terms

“…It is clear at present that in addition to the usual DPS terms, the perturbative parton splitting mechanism has to be included explicitly [49,50]. The contribution of this mechanism can be as large as the conventional DPS contribution.…”

Perturbative and nonperturbative correlations in double parton distributions

“…However, as it was argued in Refs. [38,42], the contribution under discussion may be validly included in the DPS cross section for appropriately low longitudinal momentum fractions.…”

“…It was found in Refs. [38,42] that the so-called single and double perturbative splitting graphs can significantly contribute to the inclusive cross section for the DPS process as compared to the "traditional" factorization component. It makes sense to mention here the discussion [39][40][41][42][43][44][45] concerning the double perturbative splitting graphs.…”

“…[38]. The new formula contains three contributing terms: (i) the "traditional" factorization component, (ii) the single and (iii) the double perturbative splitting graphs induced by the QCD evolution.…”

Angular correlations in the double Drell-Yan process

“…A mini-review on earlier developments of the subject is given in [31], and an overview of current developments can be found in the conference proceedings [35,36]. Recently there has been renewed interest in understanding the theoretical foundations of multiple hard scattering [37][38][39][40][41][42][43][44][45][46][47], with many issues remaining to be clarified or worked out.…”