The cusp effect in eta' --> eta pi pi decays

Details The cusp effect in eta' --> eta pi pi decays The cusp effect in eta' --> eta pi pi decays

2009-04-08

arxiv.org/abs/0904.1320v2

Eur.Phys.J.C62:511-523,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 8 figures; comment added, typos corrected, version published in Eur. Phys. J. C

Scientific paper

10.1140/epjc/s10052-009-1054-7

Strong final-state interactions create a pronounced cusp in eta' --> eta pi0
pi0 decays. We adapt and generalize the non-relativistic effective field theory
framework developed for the extraction of pi pi scattering lengths from K --> 3
pi decays to this case. The cusp effect is predicted to have an effect of more
than 8% on the decay spectrum below the pi+ pi- threshold.

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