A note on isospin violation in P-l2(gamma) decays
- Author(s)
- Vincenzo Cirigliano, Helmut Neufeld
- Abstract
We discuss the size of isospin violating effects of both electromagnetic (e≠0e≠0) and strong (mu≠mdmu≠md) origin in Pℓ2(γ)Pℓ2(γ) decays. Our results are relevant for the extraction of |Vus/Vud||Vus/Vud| from the measured ratio of the Kμ2(γ)Kμ2(γ) and πμ2(γ)πμ2(γ) decay widths combined with FK/FπFK/Fπ obtained in lattice calculations in the isospin limit. We point out that strong isospin-breaking corrections, neglected in previous studies, enter at the same level as the electromagnetic effects. The updated value for the ratio of CKM elements reads |Vus/Vud|=0.2316(12)|Vus/Vud|=0.2316(12).
- Organisation(s)
- Particle Physics
- External organisation(s)
- California Institute of Technology (Caltech)
- Journal
- Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics
- Volume
- 700
- Pages
- 7-10
- No. of pages
- 4
- ISSN
- 0370-2693
- DOI
- https://doi.org/10.1016/j.physletb.2011.04.038
- Publication date
- 2011
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103036 Theoretical physics, 103034 Particle physics
- Portal url
- https://ucris.univie.ac.at/portal/en/publications/a-note-on-isospin-violation-in-pl2gamma-decays(066dba91-779b-40d2-8aa2-bd285cfc5d91).html