Surveying the scope of the SU(2) L scalar septet sector

Extending the Standard Model by adding a scalareld transforming as a septet under SU(2)L preserves theparameter at tree level and can satisfy experimental constraints on the electroweak parameters S and T. This work presents therst fully general phenomenological study of such an extension. We examine constraints on the septet model couplings based on electroweak and Higgs observables, and use LHC searches for new physics to bound the mass of the septet to be above� 400 GeV at a 95% CL.