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K e3 decays and CKM unitarity

  • theoretical physics
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Abstract.

We present a detailed numerical study of the K e3 decays to \({\cal O}(p^6, (m_d-m_u)p^2, e^2 p^2)\) 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 \({\cal O}(p^6)\). 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.

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Authors and Affiliations

  1. Departament de Física Teórica, IFIC, Universitat de Valéncia - CSIC, Apt. Correus 22085, 46071, Valéncia, Spain

    V. Cirigliano

  2. Department of Physics, California Institute of Technology, 91125, Pasadena, California, USA

    V. Cirigliano

  3. Institut für Theoretische Physik, Universität Wien, Boltzmanngasse 5, 1090, Wien, Austria

    H. Neufeld

  4. Paul Scherrer Institut, 5232, Villigen PSI, Switzerland

    H. Pichl

Authors
  1. V. Cirigliano
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  2. H. Neufeld
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  3. H. Pichl
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Additional information

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)

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Cirigliano, V., Neufeld, H. & Pichl, H. K e3 decays and CKM unitarity. Eur. Phys. J. C 35, 53–65 (2004). https://doi.org/10.1140/epjc/s2004-01745-1

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  • DOI: https://doi.org/10.1140/epjc/s2004-01745-1

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