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Étude dans les états finals dileptoniques de différentes propriétés des paires top-antitop avec les détecteurs D0 et ATLAS

Abstract : The studies of different properties of the top-antitop pair in the dilepton final state are presented in this thesis. Two analyses have been performed in different experiments : D0 at the Tevatron and ATLAS at the LHC. Since the two colliders are different, the measurements from these experiments are complementary for studies of the top quark properties. The first analysis, performed at D0, consisted in measuring the top-antitop production cross-section simultaneously with the branching ratio t -> Wb. This measurement was done in the dilepton channel with a sample of data corresponding to an integrated luminosity of 5.4 fb⁻¹. It has then been combined with the measurement in the semileptonic channel. We obtain a precision of 8% on the cross-section which is comparable to the precision of theoretical predictions. The second analysis, performed in ATLAS, consisted in measuring the top charge asymmetry in the dilepton channel with the full 2011 dataset corresponding to 4.7 fb⁻¹. The result has been combined with the result for 1 fb⁻¹ of the semileptonic channel. We obtain: A^C(ttbar) = 0.029 +- 0.018 (stat.) +- 0.014 (syst.), which is compatible with the standard model prediction of 0.004 +- 0.001.
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https://theses.hal.science/tel-00725209
Contributor : Cécile Deterre Connect in order to contact the contributor
Submitted on : Friday, August 24, 2012 - 11:43:18 AM
Last modification on : Tuesday, December 14, 2021 - 3:56:38 AM
Long-term archiving on: : Sunday, November 25, 2012 - 2:31:44 AM

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  • HAL Id : tel-00725209, version 1

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Cécile Deterre. Étude dans les états finals dileptoniques de différentes propriétés des paires top-antitop avec les détecteurs D0 et ATLAS. Physique des Hautes Energies - Expérience [hep-ex]. Université Pierre et Marie Curie - Paris VI, 2012. Français. ⟨NNT : ⟩. ⟨tel-00725209⟩

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