Kl4 decays beyond one loop

Research output: Contribution to journalArticle


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 Ke4 decays and on elastic pion scattering. Finally, we present predictions for the slope of the form factor G and for total decay rates.


External organisations
  • University of Bern
  • University of Rome Tor Vergata
  • Nordic Institute for Theoretical Atomic Physics (NORDITA), Copenhagen
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Subatomic Physics
Original languageEnglish
Pages (from-to)427-454
Number of pages28
JournalNuclear Physics, Section B
Issue number3
Publication statusPublished - 1994 Oct 3
Publication categoryResearch
Externally publishedYes