2018 Impact factor 4.843
Particles and Fields
Eur. Phys. J. C 27, 255-262 (2003)
DOI: 10.1140/epjc/s2002-01093-2

The pionic beta decay in chiral perturbation theory

V. Cirigliano1, M. Knecht2, H. Neufeld3 and H. Pichl4

1  Departament de Física Teòrica, IFIC, Universitat de València - CSIC, Apt. Correus 22085, 46071 València, Spain
2  Centre de Physique Théorique, CNRS Luminy, Case 907, 13288 Marseille - Cedex 9, France
3  Institut für Theoretische Physik, Universität Wien, Boltzmanngasse 5, 1090 Wien, Austria
4  Paul Scherrer Institut, 5232 Villigen PSI, Switzerland

(Received: 19 September 2002 / Published online: 24 January 2003 )

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 e2 p2. We discuss the extraction of the Cabibbo-Kobayashi-Maskawa matrix element |Vud| from the experimental data. The method employed here is consistent with the analogous treatment of the $K_{\ell 3}$ decays and the determination of |Vus|.

© Società Italiana di Fisica, Springer-Verlag 2003