Abstract
The study of the Higgs boson’s properties is a cornerstone of the LHC and future collider programs. In this paper, we examine the potential to directly probe the Higgs-top interaction strength and CP-structure in the toverline{t}h channel with the Higgs boson decaying to bottom-quark pairs and top-quarks in the di-leptonic mode. We adopt the BDRS algorithm to tag the boosted Higgs and exploit the M2-assisted reconstruction to compute observables sensitive to the CP-phase at the toverline{t} rest frame, where the new physics sensitivity can be enhanced. Performing a side-band analysis at the LHC to control the continuum toverline{t}boverline{b} background, we find that the Higgs-top strength and CP-phase can be probed up to {delta}_{kappa_t} ≲ 20% and |α| ≲ 36° at 95% CL, respectively. We also derive that a similar analysis at a 100 TeV future collider could further improve the precision to {delta}_{kappa_t} ≲ 1% and |α| ≲ 1.5°, where the CP-odd observables play a crucial role, boosting the sensitivity on the CP-phase.
Highlights
Focusing on the 100 TeV Future Circular Collider (FCC) and semi-leptonic top pair final states, ref. [32] shows that a combination of side-bands and tth/ttZ ratios can uplift the top-quark Yukawa strength determination with the tt(h → bb) channel
We examine the potential to directly probe the Higgs-top interaction strength and CP-structure in the tth channel with the Higgs boson decaying to bottom-quark pairs and top-quarks in the di-leptonic mode
We present in figure 2 the invariant mass distribution of the BDRS tagged fat-jet, mBJ DRS, for the signal and background samples at the 14 TeV HL-LHC with 3 ab−1 of data
Summary
Among the several probes sensitive to the CP-structure of the Higgs-top interaction in the tth channel, the observables defined in the ttcenter-of-mass frame play a special role [21]. This reference frame allows the definition of phenomenologically relevant. A prominent example of this sort is the tensor product involving the two top quarks and the two final state charged leptons, that carry maximal top spin analyzing power, μνρσpμt pνtpρ+pσ− This initially complex phenomenological probe can be opportunely simplified in the top pair frame to a simple triple product, pt · (p + × p −), being more suitable for collider studies. This approach has been proven robust against parton shower, hadronization, and detector effects [21]
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