Speaker
Andrea Quadri
(INFN - Sez. di Milano)
Description
We provide a gauge-invariant decomposition of Feynman amplitudes in spontaneously broken gauge theories. Amplitudes are graded according to the number $l_h$ of internal lines of the propagating gauge-invariant field that represents the physical Higgs scalar and the number $l_v$ of internal lines of the propagating gauge-invariant field describing the massive vector meson.
Slavnov-Taylor identities hold separately for each $(l_h,l_v)$-sector.
The amplitudes subspace $l_h>0,l_v>0$ contains inside loops only physical propagating degrees of freedom.
We discuss the application of the formalism to the restoration of Slavnov-Taylor identities broken by intermediate regularization in the example of a chiral massive Abelian gauge model.
Author
Andrea Quadri
(INFN - Sez. di Milano)
