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arXiv 0707.2233hep-ph
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重费米子的非解耦性和一种特殊的Yukawa织构

Nondecoupling of Heavy Fermions and a Special Yukawa Texture

M. N. Rebelo

摘要:

基于与G. C.布兰科和J. I. Silva-Marcos,arXiv:hep-ph/0612252,将出现在Phys. Rev. D中。在这项工作中,我们指出,新物理学可以发挥重要的作用,在拯救一些汤川纹理零和\”atze,否则将被最近,更精确的测量$V_{CKM}$消除。我们已经表明,存在的一个isossinglet矢量类夸克与标准夸克的混合,可以呈现可行的一个特别有趣的四纹理零汤川安奈。关键的一点是等单线态夸克效应的非解耦性,即使对于任意大的质量值也是如此。

英文摘要:

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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