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