In addition, a (pseudo)scalar emission off a fermion line is also discussed. These processes are extended from earlier works to include chemical potentials and distinct species in the final state. Processes considered here are those of a neutral (pseudo)scalar decaying into two distinct (pseudo)scalars or into a fermion-antifermion pair. As phenomenologically relevant implications, we present a compendium of thermal decay rates for several typical reactions calculated within the framework of the real-time formalism and compared to the imaginary-time results found in the literature.
We start with a general pedagogical introduction into the TFT in the imaginary- and real-time formulation. This review represents a detailed and comprehensive discussion of the Thermal Field Theory (TFT) concepts and key results in Yukawa-type theories.
