Sequential Flavour Symmetry Breaking

Details Sequential Flavour Symmetry Breaking Sequential Flavour Symmetry Breaking

2009-06-08

arxiv.org/abs/0906.1523v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

22 pages latex, no figures

Scientific paper

The gauge sector of the Standard Model (SM) exhibits a flavour symmetry which allows for independent unitary transformations of the fermion multiplets. In the SM the flavour symmetry is broken by the Yukawa couplings to the Higgs boson, and the resulting fermion masses and mixing angles show a pronounced hierarchy. In this work we connect the observed hierarchy to a sequence of intermediate effective theories, where the flavour symmetries are broken in a step-wise fashion by vacuum expectation values of suitably constructed spurion fields. We identify the possible scenarios in the quark sector and discuss some implications of this approach.

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