Theory predictions for Higgs Physics at the LHC

Abstract

The particle discovered in the Higgs boson searches at the LHC, with a mass of about 125 GeV, can be identified with one of the neutral Higgs bosons of several supersymmetric extensions of the Standard Model of particle physics. We evaluate some predictions for the masses of (both neutral and charged) Higgs bosons within the framework of the Minimal Supersymmetric extension of the Standard Model (MSSM) and its generalization to the Next-to-MSSM (NMSSM), obtained by Feynman-diagrammatic methods. The predictions are based on the evaluation of the full 1-loop contributions, supplemented with leading 2-loop corrections. The procedure included the derivation of the renormalization. In the case of the MSSM, a comparison between renormalization schemes for the real and complex parameter cases is performed, while for the NMSSM only the real case was considered. Our analytical and numerical analysis includes a discussion of the renormalization and the incorporation of radiative corrections as well as a phenomenological comparison for well-motivated scenarios. Several additional theoretical aspects of NMSSM are also analysed.