Regular Article - Theoretical Physics
Dispersive treatment of and
Albert Einstein Center for Fundamental Physics, Institute for Theoretical Physics, University of Bern, Sidlerstrasse 5, 3012, Bern, Switzerland
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Accepted: 19 October 2016
Published online: 5 November 2016
We analyse the rare kaon decays and in a dispersive framework in which the weak Hamiltonian carries momentum. Our analysis extends predictions from lowest order chiral perturbation theory (PT) to fully account for effects from final-state interactions, and is free from ambiguities associated with extrapolating the kaon off-shell. Given input from and , we solve the once-subtracted dispersion relations numerically to predict the rates for and . In the leptonic modes, we find sizeable corrections to the PT predictions for the integrated rates.
© The Author(s), 2016