Chiral perturbation theory predicts pion decay widths in magnetic fields that match lattice QCD at large field strengths but differ at weak fields primarily due to variations in the pion decay constant.
Weak decay of magne- tized pions,
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Pion Weak Decay in a Magnetic Field
Chiral perturbation theory predicts pion decay widths in magnetic fields that match lattice QCD at large field strengths but differ at weak fields primarily due to variations in the pion decay constant.