1202.0054 (Chun-Fu Chang et al.)

Mimicking the Standard Model Higgs Boson in UMSSM    [PDF]

Chun-Fu Chang, Kingman Cheung, Yi-Chuen Lin, Tzu-Chiang Yuan

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.

View original: http://arxiv.org/abs/1202.0054