The leading chiral electromagnetic correction to the nonleptonic Delta I = 3/2 amplitude in kaon decays
Vincenzo Cirigliano, John F. Donoghue, Eugene Golowich
Abstract
In kaon decay, electromagnetic radiative corrections can generate shifts in the apparent Delta I = 3/2 amplitude of order alpha A0/A2 ~ 22 alpha. In order to know the true Delta I = 3/2 amplitude for comparison with lattice calculations and phenomenology, one needs to subtract off this electromagnetic effect. We provide a careful estimate of the electromagnetic shift in the amplitude, which shows that it is smaller than naive expectations, with a fractional shift of delta A2/A2 = -0.016 +- 0.01.
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