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    Sequential flavor symmetry breaking

    Thorsten Feldmann1, Martin Jung2,3, and Thomas Mannel2

    • 1Physik Department T31, Technische Universität München, D-85747 Garching, Germany
    • 2Theoretische Physik 1, Fachbereich Physik, Universität Siegen, D-57068 Siegen, Germany
    • 3Instituto de Física Corpuscular, CSIC-Universitat de València, Apartado de Correos 22085, E-46071 Valencia, Spain

    Phys. Rev. D 80, 033003 – Published 11 August, 2009

    DOI: https://doi.org/10.1103/PhysRevD.80.033003

    Abstract

    The gauge sector of the standard model exhibits a flavor symmetry that allows for independent unitary transformations of the fermion multiplets. In the standard model the flavor 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 flavor symmetries are broken in a stepwise 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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