Philipp Böer, "Resummation of double-logarithms from soft-fermion exchange"

Thursday 14 May 2026, 11:30 → 12:30 Europe/Rome

Sala Wataghin (Vecchio Edificio)

It is well known that perturbative QCD corrections to scattering processes contain large double logarithms in the high-energy limit. At leading power, they are typically induced by soft-gluon exchanges, and their all-order structure is well understood. At subleading power, however, double logarithms often originate from soft-fermion exchanges and exhibit a richer and more intricate structure. I discuss recent advances in the all-order resummation of such corrections, from simple QED processes such as muon–electron scattering to heavy-to-light $B$-meson form factors. I further discuss a systematic framework for their resummation based on asymptotic limits of anomalous dimensions, and present new results for the resummation of double logarithms in Higgs-boson pair production.