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The pionic beta decay in chiral perturbation theory |
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| Authors: | V. Cirigliano M. Knecht H. Neufeld H. Pichl |
| Affiliation: | Departament de Física Teòrica, IFIC, Universitat de València - CSIC, Apt. Correus 22085, 46071 València, Spain, ES Centre de Physique Théorique, CNRS Luminy, Case 907, 13288 Marseille - Cedex 9, France, FR Institut für Theoretische Physik, Universit?t Wien, Boltzmanngasse 5, 1090 Wien, Austria, AT Paul Scherrer Institut, 5232 Villigen PSI, Switzerland, CH |
| Abstract: | Within the framework of chiral perturbation theory with virtual photons and leptons, we present an updated analysis of the pionic beta decay including all electromagnetic contributions of order e 2 p 2 . We discuss the extraction of the Cabibbo-Kobayashi-Maskawa matrix element |V ud | from the experimental data. The method employed here is consistent with the analogous treatment of the decays and the determination of |V us |. Received: 19 September 2002 / Published online: 24 January 2003 |
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