This research constructs an effective field theory to analyze isospin-breaking in nonleptonic weak interactions, suggesting useful insights for particle physics.
We construct a low-energy effective field theory that permits the complete treatment of isospin-breaking effects in nonleptonic weak interactions to next-to leading- order. To this end we enlarge the chiral Lagrangian describing strong and ΔS=1 weak interactions by including electromagnetic terms with the photon as additional dynamical degree of freedom. The complete and minimal list of local terms at next-to-leading order is given., We perform the one-loop renormazation at the level of the generating functional and specialize to K→ππ decays.
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Eker et al. (2000) studied this question.
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