Observation of the ttH production

Abstract

The top quark is the heaviest elementary particle in the Standard Model, and has an expected Yukawa coupling of order unity. The value of this coupling is a key ingredient to unravel the nature of the observed Higgs boson. The most favourable production mode which has a direct sensitivity to this coupling is the production of a Higgs boson in association with a top-quark pair, ttH$. The observation of this process, based on the analysis of proton-proton collision data at a centre-of-mass energy of 13 TeV with the ATLAS detector at the Large Hadron Collider, is presented.