Large Top Mass and Non-Linear Representation of Flavour Symmetry

Simple item page
dc.creatorFeldmann, Thorsten
dc.creatorMannel, Thomas
dc.date2008-01-11
dc.date.accessioned2026-07-07T11:55:10Z
dc.date.available2026-07-07T11:55:10Z
dc.descriptionWe consider an effective theory (ET) approach to flavour-violating processes beyond the Standard Model (SM), where the breaking of flavour symmetry is described by spurion fields whose low-energy vacuum expectation values are identified with the SM Yukawa couplings. Insisting on canonical mass dimensions for the spurion fields, the large top-quark Yukawa coupling also implies a large expectation value for the associated spurion, which breaks part of the flavour symmetry already at the UV scale Lambda of the ET. Below that scale, flavour symmetry in the ET is represented in a non-linear way by introducing Goldstone modes for the partly broken flavour symmetry and spurion fields transforming under the residual symmetry. As a result, the dominance of certain flavour structures in rare quark decays can be understood in terms of the 1/Lambda expansion in the ET. We also discuss the generalization to 2-Higgs-doublet models with large tan(beta).
dc.description4 pages, no figures, uses revtex4
dc.identifierhttps://arxiv.org/abs/0801.1802
dc.identifierhttp://arxiv.org/abs/0801.1802
dc.identifierPhys.Rev.Lett.100:171601,2008
dc.identifierdoi:10.1103/PhysRevLett.100.171601
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/205157
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Theory
dc.titleLarge Top Mass and Non-Linear Representation of Flavour Symmetry
dc.typetext

Files

Collections

arXiv