K_{e3} decays and CKM unitarity
| dc.creator | Cirigliano, V. | |
| dc.creator | Neufeld, H. | |
| dc.creator | Pichl, H. | |
| dc.date | 2004-01-23 | |
| dc.date.accessioned | 2026-07-07T10:29:03Z | |
| dc.date.available | 2026-07-07T10:29:03Z | |
| dc.description | 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. | |
| dc.description | 13 pages, 2 figures, uses EPJC macros | |
| dc.identifier | https://arxiv.org/abs/hep-ph/0401173 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/0401173 | |
| dc.identifier | Eur.Phys.J.C35:53-65,2004 | |
| dc.identifier | doi:10.1140/epjc/s2004-01780-x | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/177663 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | K_{e3} decays and CKM unitarity | |
| dc.type | text |