Field theory on codimension-two branes and the Hierarchy problem

by Claudia de Rham (Perimeter Institute)

Thursday 15 May 2008, 13:30 → 14:30 Europe/Stockholm

CoPS group room (A5:1041)

I examine a codimension-two brane scenario in which all the observed Standard Model particles reside on a brane but the Higgs is an elementary extra-dimensional scalar in the bulk. I first present how the brane couplings between the Higgs field and the standard model particles ought to be renormalized for the low- energy theory to be regularization independent. I then show that these renormalized couplings yield two novel effects. First, they cause the Higgs vev to depend only logarithmically on the mass term of the bulk potential, thus providing a new mechanism for tackling the hierarchy problem. Second, the Higgs brane couplings cause the lowest mass KK mode to localize near the brane without any need for geometrical effects like warping. I will then finish by exploring some preliminary implications such models have for the Higgs signature at the LHC, both in the case where the extra dimensions arise at the TeV scale, and in ADD models having Large Extra Dimensions.

For references, see JC homepage.