Low-energy expansion of meson form factors |
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Authors: | J. Gasser H. Leutwyler |
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Affiliation: | Institut für Theoretische Physik der Universität Bern, Bern, Switzerland CERN, Geneva, Switzerland |
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Abstract: | We calculate the corrections to various low-energy theorems concerning the behaviour of the pseudoscalar meson form factors near t=0. In particular we discuss (i) the Ademollo-Gatto theorem, (ii) Sirlin's relation between the Kl3 form factor ƒ+Kπ(t) and the electromagnetic form factors, (iii) the Callan-Treiman relation, and (iv) the Dashen-Weinstein relation, which connects the slope λ0 of ƒ0Kπ(t) with the ratio FK/Fπ. Furthermore, we point out a remarkable isospin breaking effect which is clearly visible in the experimental rates of the decays K+→π0e+ν, K0→π−e+ν. |
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