Mimicking the standard model Higgs boson in UMSSM

Abstract

Motivated by the recent results in the standard model (SM) Higgs boson search at the Large Hadron Collider (LHC) we investigate the SM-like CP-even Higgs boson of the U(1)^′-extended minimal supersymmetric standard model (UMSSM) and its branching ratio into the $b\overline b$, WW ^*, and $\widetilde{\chi }_1^0\widetilde{\chi }_1^0$ modes. In the Summer 2011, a 2σ excess was reported in the channel $H \to W{W^* } \to {\ell^{+} }\nu {\ell^{-} }\overline \nu$ around 130 − 140 GeV range. Later on in December 2011 announcements were made that an excess was seen in the 124 − 126 GeV range, while the SM Higgs boson above 131 GeV up to about 600 GeV is ruled out. We examine two scenarios of these mass ranges: (i) ${13}0 {\text{GeV}} < {M_{{h_{{\text{SM}} - {\text{like}}}}}} < {141} {\text{GeV}}$ and show that the Higgs boson can decay into invisible neutralinos to evade the SM bound; and (ii) ${12}0 {\text{GeV}} < {M_{{h_{{\text{SM}} - {\text{like}}}}}} < {13}0 {\text{GeV}}$ and show that the Higgs boson can avoid decaying into neutralinos and thus gives enhanced rates into visible particles. We use the η model of E ₆ with TeV scale supersymmetry to illustrate the idea by scanning the parameter space to realize these two different scenarios.