Daniele Teresi
(University of Manchester)
04/12/2014, 16:35
The 3-loop Standard Model (SM) effective potential suffers from infrared (IR) divergences due to the Goldstone bosons. These IR problems start at lower loop-orders for the derivatives of the potential. We study these issues by means of the recently developed *symmetry-improved CJT effective action*. Our formalism, as opposed to other existing approaches, is particularly appropriate for...
Biagio Lucini
(Swansea University)
04/12/2014, 17:10
A novel strong interaction beyond the standard model could provide a dynamical explanation of electroweak symmetry breaking. Experimental results strongly constrain properties of models that realise this mechanism. Whether these constraints are obeyed by any strongly interacting quantum field theory is a non-perturbative problem that needs to be addressed by first-principle calculations. Monte...
Daniele Binosi
(ECT* Fondazione Bruno Kessler)
04/12/2014, 17:50
I discuss certain characteristic features encoded in some of the fundamental QCD Green's functions, whose origin can be traced back to the (Landau gauge) nonperturbative masslessness of the ghost field. Specifically, the ghost loops that contribute to these Green's functions display infrared divergences, akin to those encountered in the perturbative treatment, in contradistinction to the...
