Speaker
Description
Transverse momentum dependent parton distributions (TMDs) are crucial to increase precision in the calculations of LHC observables that are sensitive to multiple soft gluon emissions and low-x effects. Collinear parton showers can resum the cross section to take into account large contributions at high orders in the strong coupling. However, in this case transverse momentum is not present in the hard scattering event and purely arises from the shower. This gives rise to a mismatch between the matrix element and the parton shower. In the Monte Carlo event generator Cascade, a procedure is implemented to treat both the incoming partons in the hard event and the parton shower with TMDs. Current studies are performed to implement such a procedure in Pythia8.
