https://doi.org/10.1140/epjc/s10052-008-0584-8
Regular Article - Theoretical Physics
On the radiative pion decay
1
Paul Scherrer Institut, WHGA/128, 5232, Villigen PSI, Switzerland
2
Helvetia Insurance, Dufourstrasse 40, 9001, St. Gallen, Switzerland
* e-mail: rene.unterdorfer@web.de
Received:
10
February
2008
Revised:
11
March
2008
Published online:
19
April
2008
A reanalysis of the radiative pion decay together with the calculation of the radiative corrections within chiral perturbation theory (CHPT) is performed. The amplitude of this decay contains an inner Bremsstrahlung contribution and a structure-dependent part, which are both accessible in experiments. In order to obtain a reliable estimate of the hadronic contributions we combine the CHPT result with a large-Nc expansion and experimental data on other decays, which makes it possible to determine the occurring coupling constants.
© Springer-Verlag , 2008
