Probing Higgs Boson $CP$ Properties with $t\bar{t}H$ at the LHC and the 100 TeV $pp$ Collider

TL;DR

This paper investigates the potential to determine the $CP$ properties of the Higgs boson through $tar{t}H$ production at the LHC and future high-energy colliders, analyzing various operators and decay channels to assess discrimination power.

Contribution

It introduces a comprehensive analysis of $tar{t}H$ production to probe Higgs $CP$ properties at current and future colliders, including new sensitivity estimates across different energies.

Findings

$tar{t}bar{b}$ process can achieve over 3$\sigma$ discrimination at LHC and future colliders.

$tar{t}\gamma\gamma$ channel has limited discrimination at LHC but improves at higher energies.

Higher energy colliders significantly enhance the sensitivity to Higgs $CP$ properties.

Abstract

The Higgs boson $H$ has the largest coupling to the top quark $t$ among the standard model (SM) fermions. This is one of the ideal places to investigate new physics beyond SM. In this work, we study the potential of determining Higgs boson $CP$ properties at the LHC and future 33 TeV and 100 TeV $pp$ colliders by analysing various operators formed from final states variables in $t\bar{t}H$ production. The discrimination power from SM coupling is obtained with Higgs boson reconstructed from $ H\to \gamma \gamma$ and $ H\to b \bar{b}$. We find that $t\bar{t}b\bar{b}$ process can provide more than 3$\sigma$ discrimination power with 300 $fb^{-1}$ integrated luminosity in a wide range of allowed Higgs to top couplings for the LHC, the 33 TeV and 100 TeV colliders. For $t\bar{t}\gamma\gamma$ the discrimination power will be below 3$\sigma$ at the LHC, while for 33 TeV and 100 TeV colliders, more than 3$\sigma$ sensitivity can be reached.