DOI: 10.1140/epjc/s2002-01093-2
The pionic beta decay in chiral perturbation theory
V. Cirigliano1, M. Knecht2, H. Neufeld3 and H. Pichl41 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 )
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
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
decays and the
determination of
|Vus|.
© Società Italiana di Fisica, Springer-Verlag 2003
