Calculations with off-shell matrix elements, TMD parton densities and TMD parton showers

Understand

A new calculation using off-shell matrix elements with TMD parton densities supplemented with a newly developed initial state TMD parton shower is described.

• The calculation is based on the KaTie package for an automated calculation of the partonic process in high-energy factorization, making use of TMD parton densities implemented in TMDlib.
• The partonic events are stored in an LHE file, similar to the conventional LHE files, but now containing the transverse momenta of the initial partons.
• The LHE files are read in by the CASCADE package for the full TMD parton shower, final state shower and hadronization from PYTHIA where events in HEPMC format are produced.