Contributions of order O(M(QUARK)**2) K(LEPTON 3) form-factors and unitarity of the CKM matrix

Abstract : The form factors for the K_{l 3} semileptonic decay are computed to order O(p^4) in generalized chiral perturbation theory. The main difference with the standard O(p^4) expressions consists in contributions quadratic in quark masses, which are described by a single divergence-free low-energy constant, A_3. A new simultaneous analysis is presented for the CKM matrix element V_{us}, the ratio F_K/F_{pi}, K_{l 3} decay rates and the scalar form factor slope lambda_0. This framework easily accommodates the precise value for $V_{ud}$ deduced from superallowed nuclear beta-decays.
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Journal articles
Physical Review D, American Physical Society, 2000, 62, pp.033003


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Contributor : Marc Knecht <>
Submitted on : Wednesday, September 15, 2004 - 2:34:57 PM
Last modification on : Wednesday, September 15, 2004 - 2:34:57 PM

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Norman. H. Fuchs, Marc Knecht, Jan Stern. Contributions of order O(M(QUARK)**2) K(LEPTON 3) form-factors and unitarity of the CKM matrix. Physical Review D, American Physical Society, 2000, 62, pp.033003. <hal-00002810>

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