Top-quark and littlest-higgs don't mesh

by Benjamin Grinstein

Thursday 17 Sept 2009, 11:00 → 12:00 Europe/Zurich

1/1-025 (CERN)

I will describe two recent results: 1. If the top-yukawa coupling is larger than (some geometric average of) the gauge couplings then the vacuum of the littlest higgs model does NOT contain an unbroken electroweak gauge group; and 2. The collective symmetry in the top-quark yukawa coupling is imposed "by hand," the model is fine tuned. There is no simple way to fix this (a precise statement will be given)