Abstract
The Higgs production and decay rates offer a new way to probe new physics beyond the Standard Model. While dynamics aiming at alleviating the hierarchy problem generically predict deviations in the Higgs rates, the current experimental analyses cannot resolve the long- and short-distance contributions to the gluon fusion process and thus cannot access directly the coupling between the Higgs and the top quark. We investigate the production of a boosted Higgs in association with a high-transverse momentum jet as an alternative to the $t\bar{t}h$ channel to pin down this crucial coupling. Presented first in the context of an effective field theory, our analysis is then applied to models of partial compositeness at the TeV scale and of natural supersymmetry.
Highlights
Among these operators, four are important, since they control the main production mechanism of the Higgs, namely gluon fusion
Presented first in the context of an effective field theory, our analysis is applied to models of partial compositeness at the TeV scale and of natural supersymmetry
In order to obtain an estimate of the LHC potential to disentangle the current degeneracy in the plane of effective couplings, we focus on the promising channel where the Higgs boson decays to two collimated tau leptons
Summary
We aim at giving an estimate of the potential of the boosted Higgs measurement to resolve the ambiguity in the plane of the couplings (κt, κg). Hand, we take the inclusive Higgs production cross section normalized to its SM value μincl(κt, κg) σincl(κt, κg) σiSnMcl (κt + κg). Multiplying the exact LO cross section times the SM K-factor computed in the mt → ∞ limit, as in eq (2.6), is the best approximation available at the present time. We consider three different assumptions on the observed inclusive signal strength, μ0incl = 0.8, 1, 1.2 , and on the actual value of the htt coupling, κ0t = 0.8, 1, 1.2. It can be clearly seen that including the boosted Higgs measurement allows one to break the degeneracy: for example, assuming a standard inclusive rate (i.e. μ0incl = 1, figure 2(b)) but a htt coupling deviating by ±20% from the standard value (black and blue curves, respectively), the SM point can be excluded at approximately 95% CL. Because we employ the ratio of cross sections R, the preferred region in the plane of couplings depends only mildly on the scale choice
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