Measurement of the associated production of a top-antitop-quark pair and a Higgs boson decaying into a $b\bar{b}$ pair in $pp$ collisions at $\sqrt{s}=13$ TeV using the ATLAS detector at the LHC

Abstract

This paper reports the measurement of Higgs boson production in association with a $t\bar{t}$ pair in the $H\to b\bar{b}$ decay channel. The analysis uses 140 fb${}^{-1}$ of 13 TeV proton-proton collision data collected with the ATLAS detector at the Large Hadron Collider. The final states with one or two electrons or muons are employed. An excess of events over the expected background is found with an observed (expected) significance of 4.6 (5.4) standard deviations. The $t\bar{t}H$ cross-section is ${\sigma }_{t\bar{t}H}=411_{-92}^{+101}\text{fb}=411\pm 54(\text{stat.}{)}_{-75}^{+85}(\text{syst.})$ $\text{fb}$ for a Higgs boson mass of 125.09 GeV, consistent with the prediction of the Standard Model of $507_{-50}^{+35}$ $\text{fb}$. The cross-section is also measured differentially in bins of the Higgs boson transverse momentum within the simplified template cross-section framework.

55 pages in total, author list starting page 38, 12 figures, 6 tables, published in EPJC. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2020-24

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Cited by in corpus (5)

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• Search for a new pseudoscalar decaying into a pair of bottom and antibottom quarks in top-associated production in $\sqrt{s}$=13 TeV proton-proton collisions with the ATLAS detector
• Transformer Neural Networks in the Measurement of $t\bar{t}H$ Production in the $H\to b\bar{b}$ Decay Channel with ATLAS
• Measurements of $t\bar{t}$ in association with charm quarks at 13 TeV with the ATLAS experiment