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Yukawa textures, new physics, and nondecoupling

Gustavo C. Branco*, M. N. Rebelo†, and J. I. Silva-Marcos‡

  • Departamento de Física and Centro de Física Teórica de Partículas (CFTP), Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisboa, Portugal

  • *gbranco@ist.utl.pt
  • †rebelo@ist.utl.pt
  • ‡juca@cftp.ist.utl.pt
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Phys. Rev. D 76, 033008 – Published 31 August, 2007

DOI: https://doi.org/10.1103/PhysRevD.76.033008

Abstract

We point out that new physics can play an important role in rescuing some of the Yukawa texture-zero Ansätze which would otherwise be eliminated by the recent, more precise measurements of VCKM. As an example, a detailed analysis of a four texture-zero Ansatz is presented, showing how the presence of an isosinglet vectorlike quark, which mixes with standard quarks, can render viable this Yukawa texture. The crucial point is the nondecoupling of the effects of the isosinglet quark, even for arbitrary large values of its mass.

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Phys. Rev. D 76, 033008– Published 31 August, 2007
  • Received 13 April 2007

© 2007 American Physical Society

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