We perform a complete analysis of isospin breaking in K â†’ 2Ï€ amplitudes in chiral perturbation theory, including both strong isospin violation (mu 6= md) and electromagnetic corrections toâ€¦ (More)

We investigate electromagnetic effects in the framework of chiral perturbation theory. Using a completely independent method, we confirm Urech's results for the divergences of the oneâ€“loop functionalâ€¦ (More)

162001-1 On the basis of a next-to-leading-order calculation in chiral perturbation theory, the first complete analysis of isospin breaking for direct CP violation in K0 ! 2 decays is performed. Weâ€¦ (More)

We construct a low-energy effective field theory which allows the full treatment of isospinbreaking effects in semileptonic weak interactions. To this end, we enlarge the particle spectrum of chiralâ€¦ (More)

We extend the Standard Model by adding a second Higgs doublet and a right-handed neutrino singlet with a heavy Majorana mass term. In this model, there are one heavy and three light Majoranaâ€¦ (More)

We present a complete calculation of the Kl3 decays K + â†’ Ï€lÎ½l and K â†’ Ï€lÎ½l to O(p4, (md âˆ’ mu)p, ep) in chiral perturbation theory with virtual photons and leptons. We introduce the concept ofâ€¦ (More)

We calculate the leading isospin-violating and electromagnetic corrections for the decay Ï„âˆ’ â†’ Ï€0Ï€âˆ’Î½Ï„ at low energies. The corrections are small but relevant for the inclusion of Ï„ decay data in theâ€¦ (More)

We present a detailed numerical study of the Ke3 decays to O(p6, (md âˆ’ mu)p, ep) in chiral perturbation theory with virtual photons and leptons. We describe the extraction of the CKM matrix elementâ€¦ (More)

Within the framework of chiral perturbation theory with virtual photons and leptons, we present an updated analysis of the pionic beta decay including all electromagnetic contributions of order ep.â€¦ (More)