General formulae forL. Lavoura
Universidade Técnica de Lisboa, Centro de Física das Interacções Fundamentais, Instituto Superior Técnico, 1049-001 Lisboa, Portugal
(Received: 24 February 2003 / Revised version: 26 March 2003 / Published online: 2 June 2003)
At one-loop level the decay , where f1 and f2 are two spin- 1/2 particles with the same electric charge, is mediated by a boson B and a spin- 1/2 fermion F. The boson B may have either spin 0 - interacting with the fermions through the Dirac matrices 1 and - or spin 1 - with V+A and V-A couplings to the fermions. I give general formulae for the one-loop electroweak amplitude of in all these cases.
© Società Italiana di Fisica, Springer-Verlag 2003