Mimicking the Standard Model Higgs Boson in UMSSM

TL;DR

This paper explores how the UMSSM model can produce a Higgs boson with properties consistent with LHC observations, including invisible decays and enhanced visible decay rates, through parameter space analysis.

Contribution

It demonstrates how the UMSSM can accommodate Higgs boson masses around 124-141 GeV with specific decay modes, extending the understanding of Higgs phenomenology in supersymmetric models.

Findings

Higgs can decay into neutralinos to evade SM bounds.

Higgs can have enhanced visible decay rates in certain parameter regions.

UMSSM can explain LHC Higgs signals within specific mass ranges.

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 b-bar, W W*, and \chi^0_1 \chi^0_1 modes. In the Summer 2011, a 2 sigma excess was reported in the channel H -> W W* -> l+ nu l- nu-bar 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) 130 GeV < M_{h_{SM-like}} < 141 GeV and show that the Higgs boson can decay into invisible neutralinos to evade the SM bound; and (ii) 120 GeV < M_{h_{\rm SM-like}} < 130 GeV and show that the Higgs boson can avoid decaying into neutralinos and thus gives enhanced rates into visible particles. We use the \eta model of E_6 with TeV scale supersymmetry to illustrate the idea by scanning the parameter space to realize these two different scenarios.