Electroweak and Flavor Phenomenology in General Warped Models

by Gero Von Gersdorff (Ecole Polytechnique)

Friday 3 Feb 2012, 11:00 → 12:00 Europe/Paris

The simplest implementations of the Randall-Sundrum solution to the hierarchy problem are at odds with electroweak precision and flavor data, unless the Kaluza Klein (KK) scale is pushed to the multi TeV range. This not only creates a little hierarchy problem, but would also preclude these states from being discovered at the LHC. We study a class of extra dimensional models with a generalized warped metric which maintain the successful mechanism of electroweak breaking while significantly lowering the scale of New Physics. Dangerous couplings of the KK states to the Higgs boson and the heavy quarks are reduced by the deformation, and couplings of light quarks become more universal. Constraints from the S and T parameters alone then allow for a KK scale as low as 1 TeV, while Z->bb decays and flavor data suggests a slightly larger cutoff. We perform an ample scan over the parameter space of the fermions and quantify the required fine-tuning by giving the fraction of models which satisfy a given bound.