A note on isospin violation in P-l2(gamma) decays

Autor(en)
Vincenzo Cirigliano, Helmut Neufeld
Abstrakt

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(en)
Teilchenphysik
Externe Organisation(en)
California Institute of Technology (Caltech)
Journal
Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics
Band
700
Seiten
7-10
Anzahl der Seiten
4
ISSN
0370-2693
DOI
https://doi.org/10.1016/j.physletb.2011.04.038
Publikationsdatum
2011
Peer-reviewed
Ja
ÖFOS 2012
103036 Theoretische Physik, 103034 Teilchenphysik
Link zum Portal
https://ucrisportal.univie.ac.at/de/publications/a-note-on-isospin-violation-in-pl2gamma-decays(066dba91-779b-40d2-8aa2-bd285cfc5d91).html