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arXiv · 0910.0200

Cusps in eta' --> eta pi pi decays

Sebastian P. Schneider·Bastian Kubis
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Abstract

The discovery of the cusp effect in the decay K+ --> pi+ pi0 pi0 has spurred the search for other decay channels, where this phenomenon, which is generated by strong final-state interactions, should also occur. A very promising candidate is eta' --> eta pi0 pi0. The cusp effect offers an excellent opportunity to experimentally extract pi pi S-Wave scattering lengths. We adapt and generalize the non-relativistic effective field theory framework developed for K --> 3 pi decays to eta' --> eta pi pi. The cusp effect is predicted to have an effect of more than 8 % on the decay spectrum below the pi+ pi- threshold. We also show that with our current theoretical information about eta' --> eta pi pi decays, it is not possible to extract pi eta threshold parameters.

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Sebastian P. Schneider, Bastian Kubis. 2009-10-01. Cusps in eta' --> eta pi pi decays. https://arxiv.org/abs/0910.0200

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