https://doi.org/10.1140/epjc/s10052-009-0863-z
Regular Article - Theoretical Physics
Electromagnetic corrections in η→3π decays
1
Helmholtz-Institut für Strahlen- und Kernphysik (Theorie) and Bethe Center for Theoretical Physics, Universität Bonn, 53115, Bonn, Germany
2
Institut für Kernphysik (Theorie), Institute for Advanced Simulations, and Jülich Center for Hadron Physics, Forschungszentrum Jülich, 52425, Jülich, Germany
* e-mail: kubis@itkp.uni-bonn.de
Received:
2
December
2008
Published online:
6
February
2009
We re-evaluate the electromagnetic corrections to η→3π decays at next-to-leading order in the chiral expansion, arguing that effects of order e 2(m u −m d ) disregarded so far are not negligible compared to other contributions of order e 2 times a light-quark mass. Despite the appearance of the Coulomb pole in η→π + π − π 0 and cusps in η→3π 0, the overall corrections remain small.
PACS: 12.39.Fe – / 13.25.Jx – / 13.40.Ks –
© Springer-Verlag, 2009
