|Friday 21 February 2020|
|Events for day: Thursday 08 August 2019|
| 11:00 - 12:00 Theory Weekly Seminar(TWS)|
BRST invariant RG flows
PARTICLES AND ACCELERATORS
Abstract: A mass parameter for the gauge bosons in gauge-fixed four-dimensional Yang-Mills theory can be accommodated in a local and manifestly BRST-invariant action. The construction is based on the Faddeev-Popov method involving a nonlinear gauge-fixing and a background Nakanishi-Lautrup field. When applied to momentum-dependent masslike deformations, this formalism leads to a full regularization of the theory which explicitly preserves BRST symmetry. We deduce a functional renormalization group equation for the one-particle-irreducible effective action, which has a one-loop form. The master equation is compatible with it, i.e. BRST symmetr ...