Manohar and Wise papers on Higgs

New physics enhancement of gg -> H production

In Phys.Lett.B636:107-113,2006 Manohar and Wise argue that dimension 6 operators may contribute significantly to Higgs production and decay processes for which loop processes dominate in the standard model. E.g., they calculate explicitly the ratio of Xsections for gg -> H with divided by without those contributions as a function of the Wilson coefficient of the operator in the effective theory. They find a factor 2-3 or more enhancement of the Xsection roughly independent of Higgs mass, and without any significant change to the H -> WW branching fraction. This enhancement is not present for associate production, e.g. WH and ZH, as those proceed at tree level in the standard model. For CDF this means that only H -> WW search benefits from this type of new physics as all other final states, most notably bbbar, require associate production to be visible on top of background! They conclude their discussion by noting that one might expect the size of the coefficient to be O(0.1) based on gauge coupling unification in GUT theories at O(1e15) GeV? as motivated by neutrino masses.
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The full paper may be found at:hep-ph 0601212

-- FkW - 26 Nov 2006

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