Can Massless and Light Yukawaons be Harmless?

Details Can Massless and Light Yukawaons be Harmless? Can Massless and Light Yukawaons be Harmless?

2009-02-26

arxiv.org/abs/0902.4501v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

version accepted by IJMPA, 14 pages, no figure, title and presentation changed

Scientific paper

In the so-called yukawaon model, where the effective Yukawa coupling constants Y_f^{eff} (f=e,\nu,u,d) are given by vacuum expectation values (VEVs) of gauge singlet scalars (yukawaons) Y_f with 3\times 3 components, i.e. Y_f^{eff}= y_f < Y_f>/\Lambda, massless (and light) scalars appear because a global flavor symmetry is assumed. In order to demonstrate whether such massless scalars in the yukawaon model are harmless or not, yukawaon masses are explicitly estimated, as an example, in the charged lepton sector.

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