Cusps in K_L --> 3 pi decays

Details Cusps in K_L --> 3 pi decays Cusps in K_L --> 3 pi decays

2007-10-24

arxiv.org/abs/0710.4456v1

Phys.Lett.B659:576-584,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, 3 figures, uses Elsevier style

Scientific paper

10.1016/j.physletb.2007.11.008

The pion mass difference generates a pronounced cusp in K --> 3 pi decays, the strength of which is related to the pi pi S-wave scattering lengths. We apply an effective field theory framework developed earlier to evaluate the amplitudes for K_L --> 3 pi decays in a systematic manner, where the strictures imposed by analyticity and unitarity are respected automatically. The amplitudes for the decay eta --> 3 pi are also given.

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