Quark mixing from softly broken symmetries

Details Quark mixing from softly broken symmetries Quark mixing from softly broken symmetries

2003-12-23

arxiv.org/abs/hep-ph/0312330v1

JHEP 0405 (2004) 016

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, plain Latex, no figures

Scientific paper

10.1088/1126-6708/2004/05/016

Quark flavor mixing may originate in the soft breaking of horizontal symmetries. Those symmetries, which in the simplest case are three family U(1) groups, are obeyed only by the dimension-4 Yukawa couplings and lead, when unbroken, to the absence of mixing. Their breaking may arise from the dimension-3 mass terms of SU(2)-singlet vector-like quarks. Those gauge-singlet mass terms break the horizontal symmetries at a scale much higher than the Fermi scale, yet softly, leading to quark mixing while the quark masses remain unsuppressed.

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