Holograms of a Dynamical Top Quark
arXiv:1703.08330 · doi:10.1103/PhysRevD.96.055016
Abstract
We present holographic desciptions of dynamical electroweak symmetry breaking models that incorporate the top mass generation mechanism. The models allow computation of the spectrum in the presence of large anomalous dimensions due to walking and strong NJL interactions. Technicolour and QCD dynamics are described by the bottom-up Dynamic AdS/QCD model for arbitrary gauge groups and numbers of quark flavours. An assumption about the running of the anomalous dimension of the quark bilinear operator is input and the model then predicts the spectrum and decay constants for the mesons. We add NJL interactions responsible for flavour physics from extended tecnhicolour, top-colour etc using Witten's multi-trace prescription. We show the key behaviours of a top condensation model can be reproduced. We study generation of the top mass in (walking) one doublet and one family technicolour models and with strong ETC interactions. The models clearly reveal the tensions between the large top mass and precision data for delta rho. The neccessary tunings needed to generate a model compatible with precision constraints are simply demonstrated.
16 pages, 15 figures
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