Radiative Ke3 decays revisited |
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| Authors: | J. Gasser B. Kubis N. Paver M. Verbeni |
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| Affiliation: | (1) Institut für theoretische Physik, Universität Bern, Sidlerstrasse 5, 3012 Bern, Switzerland;(2) Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, Nussallee 14-16, 53115 Bonn, Germany;(3) Dipartimento di Fisica Teorica, Universitá degli Studi di Trieste, 34100 Trieste, Italy;(4) INFN-Trieste, Strada Costiera 11, 34100 Trieste, Italy;(5) Departamento de Física Teórica y del Cosmos, Universidad de Granada, Campus de Fuente Nueva, 18002 Granada, Spain |
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| Abstract: | ![]()
Motivated by recent experimental results and ongoing measurements, we review the chiral perturbation theory prediction for  decays. Special emphasis is given to the stability of the inner bremsstrahlung-dominated relative branching ratio versus the K e3 form factors, and on the separation of the structure-dependent amplitude in differential distributions over the phase space. For the structure-dependent terms, an assessment of the order p 6 corrections is given, in particular, a full next-to-leading order calculation of the axial component is performed. The experimental analysis of the photon energy spectrum is discussed, and other potentially useful distributions are introduced.Received: 9 December 2004, Published online: 21 February 2005PACS: 13.20.Eb, 11.30.Rd, 12.39.Fe |
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