Nondecoupling of Heavy Fermions and a Special Yukawa Texture

Details Nondecoupling of Heavy Fermions and a Special Yukawa Texture Nondecoupling of Heavy Fermions and a Special Yukawa Texture

2007-07-15

arxiv.org/abs/0707.2233v1

Int.J.Mod.Phys.A22:5853-5859,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

Invited talk at CTP Symposium on Supersymmetry at LHC: Theoretical and Experimental Prospectives, Cairo, Egypt, 11-14 Mar 2007

Scientific paper

10.1142/S0217751X07039079

Talk based on work entitled ``Yukawa textures, new physics and nondecoupling,'' done in collaboration with G. C. Branco and J. I. Silva-Marcos, arXiv:hep-ph/0612252, to appear in Phys. Rev. D. In this work we pointed out that New Physics can play an important r\^ ole in rescuing some of the Yukawa texture zero ans\" atze which would otherwise be eliminated by the recent, more precise measurements of $V_{CKM}$. We have shown that the presence of an isosinglet vector-like quark which mixes with standard quarks, can render viable a particularly interesting four texture zero Yukawa ansatz. 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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