Sudakov resummation in QCD

Understand

In this PhD thesis, we analyze and generalize the renormalization group approach to the resummation of large logarithms in the perturbative expansion due to soft and collinear multiparton emissions.

• In particular, we present a generalization of this approach to prompt photon production.
• It is interesting to see that also with the more intricate two-scale kinematics that characterizes prompt photon production in the soft limit, it remains true that resummation simply follows from general kinematic properties of the phase space.
• Also, this approach does not require a separate treatment of individual colour structures when more than one colour structure contributes to fixed order results.