Directly Probing the CP-structure of the Higgs-Top Yukawa at HL-LHC and Future Colliders

arXiv

2203.08127

Date

2022-03-15

Frontier

Energy Frontier (EF)

Topical groups

• EF1
• TF7

Submitted by

Dorival Goncalves

Abstract

Constraining the Higgs boson properties is a cornerstone of the LHC program and future colliders. In this Snowmass contribution, we study the potential to directly probe the Higgs-top CP-structure via the $t\overline{t}h$ production at the HL-LHC, 100 TeV FCC and muon colliders. We find the limits on the CP phase ($\alpha$) at 95% CL are $|\alpha |\lesssim {36}^{\circ }$ with dileptonic $t\overline{t}(h\to b\overline{b})$ and $|\alpha |\lesssim {25}^{\circ }$ with combined $t\overline{t}(h\to \gamma \gamma )$ at the HL-LHC. The 100 TeV FCC brings a significant improvement in sensitivity with $|\alpha |\lesssim 3^{\circ }$ for the dileptonic $t\overline{t}(h\to b\overline{b})$, due to the remarkable gain in the signal cross-section and the increased luminosity. At future muon colliders, we find that the bounds with semileptonic $t\overline{t}(h\to b\overline{b})\nu \overline{\nu }$ are $|\alpha |\lesssim 9^{\circ }$ for 10 TeV and $|\alpha |\lesssim 3^{\circ }$ for 30 TeV, respectively.