HIGGS 2024

Examining the CP properties of the top-Yukawa and the ggH coupling

6 Nov 2024, 15:40

20m

Uppsala University Main Building

BSM Higgs physics Common session: precision & BSM 2 - sal IX

Speaker

Marco Menen (Leibniz Universität Hannover)

Description

The $\mathcal{CP}$ structure of the Higgs couplings is a fundamental property which has not yet been constrained with high precision. The Higgs-top quark coupling is of particular interest due to its size and accessibility at the LHC via top-associated Higgs production and gluon fusion. To improve the sensitivity to the CP property of this coupling, we propose an extension to the STXS framework of the ttH process by extending the binning in the transverse momentum of the Higgs boson $p_{T,H}$ by either the pseudorapidity difference of the two top-quarks $\mathrm{\Delta }{\eta }_{t\overline{t}}$, or a variable that is based on the top quark momenta, namely $b_2$ or the Collins-Soper angle $|\cos {\theta }^{\ast }|$. Furthermore, we exploit the $\mathcal{CP}$ sensitivity of a so far neglected phase space region for gluon fusion with a multivariate approach. Our results suggest that significant improvements in current experimental limits are possible.

Presentation materials

Higgs_2024_Uppsala.pdf