The leading chiral electromagnetic correction to the nonleptonic ΔI=3/2 amplitude in kaon decays

1998/10/31 by Vincenzo Cirigliano, John F. Donoghue, Eugene Golowich · 1 citation
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph

paper · pdf · doi:10.1016/s0370-2693(99)00138-0

13 pages, 5 figures Revised comments and title

arxiv created 1999/01/05 · openalex publication_date 1999/03/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

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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