Speaker
Jonathan Gaunt
(DESY)
Description
I will discuss the role of a particular class of graph in the double parton scattering total cross section. These are the '2v1' or `single perturbative splitting' graphs, in which two 'nonperturbatively generated' (NP) ladders interact with two ladders that have been generated via a perturbative 1->2 branching process. I will argue that these graphs do contribute to the LO DPS cross section, albeit with a different geometrical prefactor to the one that applies to the '2v2'/'zero perturbative splitting' graphs. I will also show that in these graphs there can be 'crosstalk' between the NP ladders, and discuss the numerical significance of this crosstalk.
Author
Jonathan Gaunt
(DESY)
