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We use one-loop SU(2)L×SU(2)R chiral perturbation theory (SU(2) ChPT) to study the behaviour of the form-factors for semileptonic K→π decays with the pion mass at q2=0 and at qmax2=(mK−mπ)2, where q is the momentum transfer. At q2=0, the final-state pion has an energy of approximately mK/2 (for mK≫mπ) and so is not soft, nevertheless it is possible to compute the chiral logarithms, i.e. the corrections...
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