Published June 2004
| Submitted
Journal Article
Open
K_(e3) decays and CKM unitarity
- Creators
- Cirigliano, V.
- Neufeld, H.
- Pichl, H.
Abstract
We present a detailed numerical study of the K_{e3} decays to O(p^6,(m_d-m_u)p^2,e^2p^2) in chiral perturbation theory with virtual photons and leptons. We describe the extraction of the CKM matrix element |V_(us)| from the experimental K_(e3) decay parameters. We propose a consistency check of the K^+_(e3) and K^0_(e3) data that is largely insensitive to the dominating theoretical uncertainties, in particular the contributions of order p^6. Our analysis is highly relevant in view of the recent high statistics measurement of the K^+_(e3) branching ratio by E865 at Brookhaven which does not indicate any significant deviation from CKM unitarity but rather a discrepancy with the present K^0_(e3) data.
Additional Information
© Springer-Verlag / Società Italiana di Fisica 2004. Received: 22 January 2004, Published online: 30 April 2004. Work supported in part by IHP-RTN, Contract No. HPRN-CT2002-00311 (EURIDICE) and by Acciones Integradas, Project No. 19/2003 (Austria), HU2002-0044 (MCYT, Spain). We thank J. Bijnens, G. Ecker, J. Gasser and H. Leutwyler for useful remarks. We have profited from discussions with G. Isidori, B. Sciascia, T. Spadaro, and J. Thompson. V.C. is supported by a Sherman Fairchild fellowship from Caltech.Attached Files
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Additional details
- Eprint ID
- 76121
- Resolver ID
- CaltechAUTHORS:20170408-160424209
- HPRN-CT2002-00311
- European Union
- 19/2003
- Acciones Integradas
- HU2002-0044
- Ministerio de Ciencia y Tecnologia (MCYT)
- Sherman Fairchild Foundation
- Created
-
2017-06-15Created from EPrint's datestamp field
- Updated
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2021-11-15Created from EPrint's last_modified field