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Phantom Higgs from Unparticles
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A renormalizable coupling between the Higgs and a scalar unparticle operator O_U of non-integer dimension d_U < 2 gives rise, after electroweak symmetry breaking, to a mass gap in the unparticle continuum and a shift in the original Higgs mass, which can end up above or below the mass gap. We show that, besides the displaced Higgs state, a new isolated state can generically appear in the spectrum near or below the mass gap. Such state (which we call phantom Higgs) is a mixture of Higgs and unparticles and therefore has universally reduced couplings to fermions and gauge bosons. This phenomenon could cause the mass of the lightest Higgs state accessible to colliders to be much smaller than the mass expected from the SM Lagrangian.
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Cited by 1 Pith paper
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Quantum Critical Higgs: From AdS$_5$ to Colliders
In QCH models the large enhancement expected in gg to ZZ cancels once the correct i epsilon branch is used, while gg to HZ develops an order-of-magnitude excess at high invariant mass.
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