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