K to ππdecays and the K to σweak amplitude

Details K to ππdecays and the K to σweak amplitude K to ππdecays and the K to σweak amplitude

2012-02-28

arxiv.org/abs/1202.6254v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages

Scientific paper

We use a twice-subtracted partial-wave dispersion relation in the elastic unitarity approximation for final-state interactions to study the amplitude for the delta I = 1/2 CP-conserving weak process K+spurion->pi+pi. We use a simple parameterization to approximate the low energy I = 0 S-wave pipi->pipi scattering phase shift and extract the residue of the sigma pole in the weak amplitude obtained from the dispersion relation. Using this residue, we relate the K->pipi decay amplitude, the weak amplitude at the soft pion point and the K->sigma weak amplitude.

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