Higgs characterisation at NLO in QCD: CP properties of the top-quark Yukawa interaction

Federico Demartin , Fabio Maltoni , Kentarou Mawatari , Ben Page , Marco Zaro (1)

1 LPTHE - Laboratoire de Physique Théorique et Hautes Energies

At the LHC the CP properties of the top-quark Yukawa interaction can be probed through Higgs production in gluon fusion or in association with top quarks. We consider the possibility for both CP-even and CP-odd couplings to the top quark to be present, and study CP-sensitive observables at next-to-leading order (NLO) in QCD, including parton-shower effects. We show that the inclusion of NLO corrections sizeably reduces the theoretical uncertainties, and confirm that di-jet correlations in $H+2$ jet production through gluon fusion and correlations of the top-quark decay products in $t\bar tH$ production can provide sensitive probes of the CP nature of the Higgs interactions.

Domaines: Physique des Hautes Energies - Phénoménologie [hep-ph]

Federico Demartin, Fabio Maltoni, Kentarou Mawatari, Ben Page, Marco Zaro. Higgs characterisation at NLO in QCD: CP properties of the top-quark Yukawa interaction. 2014. ⟨hal-01026170⟩