Joint INFN-UNIMI-UNIMIB Pheno Seminars
Local structure of threshold singularities in Feynman diagrams and differential observables
by
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Europe/Zurich
Aula Caldirola (Università degli Studi di Milano)
Aula Caldirola
Università degli Studi di Milano
Via Celoria 16, 20133 Milano
Description
In this talk, I will systematically approach the study of threshold singularities of Feynman diagrams in momentum space, using methods from convex geometry and graph theory. I will also describe how non-pinched threshold singularities can be regularised by analytically continuing the integrand, provided monodromy constraints are satisfied. I will conclude by discussing the cancellation of collinear and soft final-state singularities in differential cross-sections through the Local Unitarity formalism, and briefly comment on the repercussions of extending such cancellation mechanism to initial-state singularities.