Hefty MSSM-like light Higgs in extended gauge models

Abstract

It is well known that in the MSSM the lightest neutral Higgs h 0 must be, at the tree level, lighter than the Z boson and that the loop corrections shift this stringent upper bound up to about 130GeV. Extending the MSSM gauge group in a suitable way, the new Higgs sector dynamics can push the tree-level mass of h 0 well above the tree-level MSSM limit if it couples to the new gauge sector. This effect is further pronounced at the loop level and h 0 masses in the 140GeV ballpark can be reached easily. We exemplify this for a sample setting with a low-scale U(1) R ×U(1) B-L gauge symmetry in which neutrino masses can be implemented via the inverse seesaw mechanism. © SISSA 2012.