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The associated production of a Higgs boson and a top-quark pair is measuredin events characterised by the presence of one or two electrons or muons. TheHiggs boson decay into a $b$-quark pair is used. The analysed data,corresponding to an integrated luminosity of 139 fb$^{-1}$, were collected inproton-proton collisions at the Large Hadron Collider between 2015 and 2018 ata centre-of-mass energy of $\sqrt{s}=13$ TeV. The measured signal strength,defined as the ratio of the measured signal yield to that predicted by theStandard Model, is $0.35^{+0.36}_{-0.34}$. This result is compatible with theStandard Model prediction and corresponds to an observed (expected)significance of 1.0 (2.7) standard deviations. The signal strength is alsomeasured differentially in bins of the Higgs boson transverse momentum in thesimplified template cross-section framework, including a bin for speciallyselected boosted Higgs bosons with transverse momentum above 300 GeV.

the journal of high energy physics/the journal of high energy physics

Measurement of Higgs boson decay into $b$-quarks in associated  production with a top-quark pair in $pp$ collisions at $\sqrt{s}=13$ TeV with  the ATLAS detector