3 papers
hep-ph2020
Diphoton decay of the higgs from the Epstein--Glaser viewpoint
Pawel Duch, Michael Duetsch, Jose M. Gracia-Bondia
We revisit a nearly ten-year old controversy on the diphoton decay of the Higgs particle. To a large extent, the controversy turned around the respective merits of the regularizati…
math-ph2020
The Master Ward Identity for scalar QED
Michael Dütsch, Luis Peters, Karl-Henning Rehren
It is emphasized that for interactions with derivative couplings, the Ward Identity (WI) securing the preservation of a global U(1) symmetry should be modified. Scalar QED is taken…
hep-th2002
The Master Ward Identity and Generalized Schwinger-Dyson Equation in Classical Field Theory
Michael Duetsch, Klaus Fredenhagen
In the framework of perturbative quantum field theory a new, universal renormalization condition (called Master Ward Identity) was recently proposed by one of us (M.D.) in a joint…