Probing top-partners in Higgs plus jets

Fermionic top-partners arise in models such as Composite Higgs and Little Higgs. They modify Higgs properties, in particular how the Higgs couples to top quarks. Alas, there is a low-energy cancellation acting in the coupling of the Higgs boson to gluons and photons. As a result of this cancellation, no information about the spectrum and couplings of the top-partners can be obtained in gg -> h, just the overall new physics scale f. In this paper we show that this is not the case when hard radiation is taken into account. Indeed, differential distributions in Higgs plus jets are sensitive to the top-partner mass and coupling to the Higgs. We exploit the transverse momentum distribution of the hard jet to estimate limits on the top-partners in the 14TeV LHC run. Relying on h -> gamma gamma events alone, we find mixing angles of sin(2)(theta(R)) greater than or similar to 0.2 can be probed after 3000 fb(-1) of 14TeV LHC data. Including other modes, the sensitivity improves, up to sin(2)(theta(R)) greater than or similar to 0.05 after 300 fb(-1).