Publicação

Measurement of the associated production of a top-antitop-quark pair and a Higgs boson decaying into a b(b)over-bar pair in pp collisions at √s=13 TeV using the ATLAS detector at the LHC

Detalhes bibliográficos
Resumo:	This paper reports the measurement of Higgs boson production in association with a \( t\bar{t} \) pair in the \( H \rightarrow b\bar{b} \) 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 elec trons 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 \( \sigma_{t\bar{t} H} = 411^{+101}_{-92} \text{ fb} = 411 \pm 54(\text{stat.})^{+85}_{-75}(\text{syst.}) \text{ fb} \) for a Higgs boson mass of 125.09 GeV, consistent with the prediction of the Standard Model of \( 507^{+35}_{-50} \text{ fb} \). The cross-section is also measured differentially in bins of the Higgs boson transverse momentum within the simplified template cross-section framework.
Autores principais:	Castro, Nuno Filipe
Outros Autores:	Onofre, A.; ATLAS Collaboration
Assunto:	Ciências Naturais::Ciências Físicas
Ano:	2025
País:	Portugal
Tipo de documento:	artigo
Tipo de acesso:	acesso aberto
Instituição associada:	Universidade do Minho
Idioma:	inglês
Origem:	RepositóriUM - Universidade do Minho

Descrição
Resumo:	This paper reports the measurement of Higgs boson production in association with a \( t\bar{t} \) pair in the \( H \rightarrow b\bar{b} \) 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 elec trons 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 \( \sigma_{t\bar{t} H} = 411^{+101}_{-92} \text{ fb} = 411 \pm 54(\text{stat.})^{+85}_{-75}(\text{syst.}) \text{ fb} \) for a Higgs boson mass of 125.09 GeV, consistent with the prediction of the Standard Model of \( 507^{+35}_{-50} \text{ fb} \). The cross-section is also measured differentially in bins of the Higgs boson transverse momentum within the simplified template cross-section framework.