## Observation of Higgs boson production in association with a top quark pair at the LHC with the ATLAS detector

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Original language English 173-191 Physics Letters B B784 24 Jul 2018 Published - 10 Sep 2018

### Abstract

The observation of Higgs boson production in association with a top quark pair ($t\bar{t}H$), based on the analysis of proton-proton collision data at a centre-of-mass energy of 13 TeV recorded with the ATLAS detector at the Large Hadron Collider, is presented. Using data corresponding to integrated luminosities of up to 79.8 fb$^{-1}$, and considering Higgs boson decays into $b\bar{b}$, $WW^*$, $\tau\tau$, $\gamma\gamma$, and $ZZ^*$, the observed significance is 5.8 standard deviations, compared to an expectation of 4.9 standard deviations. Combined with the $t\bar{t}H$ searches using a dataset corresponding to integrated luminosities of 4.5 fb$^{-1}$ at 7 TeV and 20.3 fb$^{-1}$ at 8 TeV, the observed (expected) significance is 6.3 (5.1) standard deviations. Assuming Standard Model branching fractions, the total $t\bar{t}H$ production cross section at 13 TeV is measured to be 670 $\pm$ 90 (stat.) $^{+110}_{-100}$ (syst.) fb, in agreement with the Standard Model prediction.

### Research areas

• p p: scattering | p p: colliding beams | top: pair production | Higgs particle: associated production | Higgs particle: decay modes | bottom: pair production | W: pair production | Z0: pair production | tau: pair production | photon: pair production | Higgs particle: coupling | coupling: Yukawa | CERN LHC Coll | ATLAS | mass spectrum: two-photon | mass spectrum: (4lepton) | Higgs particle: branching ratio | total cross section: measured | experimental results | 13000 GeV-cms