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Measurement of the inclusive and fiducial tt¯ production cross-sections in the lepton+jets channel in pp collisions at s√=8 TeV with the ATLAS detector

M Aaboud Marisílvia Donadelli; José Luis La Rosa Navarro; Marco Aurelio Lisboa Leite

European Journal Physical C Bristol v. 78, n. 487, p. 1-31, 2018

Berlim 2018

Acesso online

  • Título:
    Measurement of the inclusive and fiducial tt¯ production cross-sections in the lepton+jets channel in pp collisions at s√=8 TeV with the ATLAS detector
  • Autor: M Aaboud
  • Marisílvia Donadelli; José Luis La Rosa Navarro; Marco Aurelio Lisboa Leite
  • Assuntos: COLISÕES DE ÍONS PESADOS RELATIVÍSTICOS; LHC
  • É parte de: European Journal Physical C Bristol v. 78, n. 487, p. 1-31, 2018
  • Notas: Disponível em: . Acesso em: 03 dez. 2018
  • Descrição: The inclusive and fiducial tt¯ production cross-sections are measured in the lepton+jets channel using 20.2 fb−1 of proton–proton collision data at a centre-of-mass energy of 8 TeV recorded with the ATLAS detector at the LHC. Major systematic uncertainties due to the modelling of the jet energy scale and b-tagging efficiency are constrained by separating selected events into three disjoint regions. In order to reduce systematic uncertainties in the most important background, the W+\,jets process is modelled using Z + jets events in a data-driven approach. The inclusive tt¯ cross-section is measured with a precision of 5.7% to be σinc(tt¯)=248.3±0.7(stat.)±13.4(syst.)±4.7(lumi.) pb , assuming a top-quark mass of 172.5 GeV. The result is in agreement with the Standard Model prediction. The cross-section is also measured in a phase space close to that of the selected data. The fiducial cross-section is σfid(tt¯)=48.8±0.1(stat.)±2.0(syst.)±0.9(lumi.) pb with a precision of 4.5%.
  • Editor: Berlim
  • Data de criação/publicação: 2018
  • Formato: 31 p.
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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