Chiral perturbation theory with virtual photons and leptons |
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Authors: | M Knecht H Neufeld H Rupertsberger P Talavera |
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Institution: | Dipartimento di Fisica, Università di Trieste and INFN Trieste, Area di Ricerca, Padriciano 99, 34012 Trieste, Italy, IT Dipartimento di Fisica, Università di Bari and INFN Bari, via Amendola 173, 70126 Bari, Italy, IT
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Abstract: | We construct a low-energy effective field theory which allows for a full treatment of the isospin-breaking effects in semileptonic
weak interactions. To this end, we enlarge the particle spectrum of chiral perturbation theory with virtual photons by including
also the light leptons as dynamical degrees of freedom. Using super-heat-kernel techniques, we determine the additional one-loop
divergences generated by the presence of virtual leptons and give the full list of associated local counterterms. We illustrate
the use of our effective theory by applying it to the decays and .
Received: 9 September 1999 / Published online: 10 December 1999 |
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