Kl4 decays beyond one loop

Summary, in English

The matrix elements for K → ππlν decays are described by four form factors F, G, H and R. We complete previous calculations by evaluating R at next-to-leading order in the low-energy expansion. We then estimate higher order contributions using dispersion relations and determine the low-energy constants L₁, L₂ and L₃ from data on K_e4 decays and on elastic pion scattering. Finally, we present predictions for the slope of the form factor G and for total decay rates.

• Author: J. Bijnens; G. Colangelo; J. Gasser
• Publishing year: 1994-10-03
• Language: English
• Pages: 427-454
• Publication/Series: Nuclear Physics, Section B
• Volume: 427
• Issue: 3
• Links: http://dx.doi.org/10.1016/0550-3213(94)90634-3
• Document type: Journal article
• Publisher: North-Holland
• Topic: Subatomic Physics
• Status: Published
• ISBN/ISSN/Other: ISSN: 0550-3213