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Electromagnetic corrections in η→3π decays

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Abstract

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 ηπ + π π 0 and cusps in η→3π 0, the overall corrections remain small.

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Correspondence to Bastian Kubis.

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Ditsche, C., Kubis, B. & Meißner, UG. Electromagnetic corrections in η→3π decays. Eur. Phys. J. C 60, 83–105 (2009). https://doi.org/10.1140/epjc/s10052-009-0863-z

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