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A heavy Standard Model Higgs boson is not only disfavored by electroweakprecision observables but is also excluded by direct searches at the 7 TeV LHCfor a wide range of masses. Here, we examine scenarios where a heavy Higgsboson can be made consistent with both the indirect constraints and the directnull searches by adding only one new particle beyond the Standard Model. Thisnew particle should be a weak multiplet in order to have additionalcontributions to the oblique parameters. If it is a color singlet, we find thata heavy Higgs with an intermediate mass of 200 - 300 GeV can decay into the newstates, suppressing the branching ratios for the standard model modes, and thushiding a heavy Higgs at the LHC. If the new particle is also charged under QCD,the Higgs production cross section from gluon fusion can be reducedsignificantly due to the new colored particle one-loop contribution. Currentcollider constraints on the new particles allow for viable parameter space toexist in order to hide a heavy Higgs boson. We categorize the generalsignatures of these new particles, identify favored regions of their parameterspace and point out that discovering or excluding them at the LHC can provideimportant indirect information for a heavy Higgs. Finally, for a very heavyHiggs boson, beyond the search limit at the 7 TeV LHC, we discuss threeadditional scenarios where models would be consistent with electroweakprecision tests: including an additional vector-like fermion mixing with thetop quark, adding another U(1) gauge boson and modifying triple-gauge bosoncouplings.

Hiding a Heavy Higgs Boson at the 7 TeV LHC