Proposal for simplified template cross-sections extension using CP observables in tt̄H

The Large Hadron Collider (LHC) offers a unique opportunity to investigate CP 𝒞 𝒫 violation in the Yukawa coupling between the Higgs boson and the top quark by studying Higgs production in association with top quarks; this is of fundamental importance, seeing that the CP 𝒞 𝒫 properties of the Higgs boson are yet to measure with high precision. To address this, the focus of this work has been an extension of the simplified template cross-section (STXS) framework, devised to be sensitive to CP 𝒞 𝒫 effects. Our study focused on CP 𝒞 𝒫 -sensitive observables across multiple Higgs decay channels, comparing their performances. The result indicates that the most efficient extension of the current binning used in the STXS framework, which currently uses the Higgs boson’s transverse momentum pT,H p T , H , requires adding one further split using CP 𝒞 𝒫 -sensitive observables. Between these observables, one of the best is the Collins-Soper angle |cosθ^*| | cos θ * | , a variable derived from momenta information of the top quarks. We have investigated the improvement brought by our two-dimensional STXS setup and compared it to the currently employed methodologies, finding an increase in performances at an integrated luminosity of 300 fb⁻¹ 300 f b − 1 . Moreover, our results highlight that this advantage seems to be present also at 3000 fb⁻¹ 3000 f b − 1 .