We study the phenomenology in the U(1)′-extended Minimal Supersymmetric Standard Model (UMSSM) primarily on the decays of U(1)′-extended Z′ boson and mimic SM Higgs boson. The work comprises two main parts. In the first part, the decay of the Z′ boson into supersymmetric
particles is studied. We investigate how these supersymmetric modes affect the current limits from
the Tevatron and project the expected sensitivities at the LHC. In the second part, we turn to the SM-like CP-even Higgs boson of the UMSSM. Motivated by the recent results at the LHC we use the η model of E6 with TeV
scale supersymmetry to scan the parameter space to study two scenarios of these mass ranges: (i)
130GeV < Mh_{SM−like} < 141GeV and show that the Higgs boson can decay into invisible neutralinos
to evade the SM bound; and (ii) 120GeV < Mh_{SM−like} < 130GeV and show that the Higgs boson
can avoid decaying into neutralinos and thus gives enhanced rates into visible particles.

We study the phenomenology in the U(1)′-extended Minimal Supersymmetric Standard Model (UMSSM) primarily on the decays of U(1)′-extended Z′ boson and mimic SM Higgs boson. The work comprises two main parts. In the first part, the decay of the Z′ boson into supersymmetric
particles is studied. We investigate how these supersymmetric modes affect the current limits from
the Tevatron and project the expected sensitivities at the LHC. In the second part, we turn to the SM-like CP-even Higgs boson of the UMSSM. Motivated by the recent results at the LHC we use the η model of E6 with TeV
scale supersymmetry to scan the parameter space to study two scenarios of these mass ranges: (i)
130GeV < Mh_{SM−like} < 141GeV and show that the Higgs boson can decay into invisible neutralinos
to evade the SM bound; and (ii) 120GeV < Mh_{SM−like} < 130GeV and show that the Higgs boson
can avoid decaying into neutralinos and thus gives enhanced rates into visible particles.

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