Semileptonic Hyperon Decays and Cabibbo-Kobayashi-Maskawa Unitarity

Nicola Cabibbo, Earl C. Swallow, and Roland Winston
Phys. Rev. Lett. 92, 251803 – Published 23 June 2004

Abstract

Using a technique that is not subject to first-order SU(3) symmetry breaking effects, we determine the Vus element of the Cabibbo-Kobayashi-Maskawa matrix from data on semileptonic hyperon decays. We obtain Vus=0.2250(27), where the quoted uncertainty is purely experimental. This value is of similar experimental precision to the one derived from Kl3, but it is higher and thus in better agreement with the unitarity requirement, |Vud|2+|Vus|2+|Vub|2=1. An overall fit, including the axial contributions and neglecting SU(3) breaking corrections, yields F+D=1.2670±0.0035 and FD=0.341±0.016 with χ2=2.96/3   degrees of freedom.

  • Received 11 June 2003

DOI:https://doi.org/10.1103/PhysRevLett.92.251803

©2004 American Physical Society

Authors & Affiliations

Nicola Cabibbo*

  • Department of Physics, University of Rome-La Sapienza and INFN, Sezione di Roma 1, Piazzale A. Moro 5, 00185 Rome, Italy

Earl C. Swallow

  • Department of Physics, Elmhurst College, Elmhurst, Illinois 60126, USA and Enrico Fermi Institute, The University of Chicago, Chicago, Illinois, USA

Roland Winston

  • Division of Natural Sciences, The University of California-Merced, Merced, California 95344, USA

  • *Electronic address: nicola.cabibbo@roma1.infn.it
  • Electronic address: earls@elmhurst.edu
  • Electronic address: rwinston@ucmerced.edu

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Issue

Vol. 92, Iss. 25 — 25 June 2004

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