This paper presents a measurement of the top quark pair ( TeX ) production charge asymmetry A C using 4.7 fb−1 of proton-proton collisions at a centre-of-mass energy TeX = 7 TeV collected by the ATLAS detector at the LHC. A TeX -enriched sample of events with a single lepton (electron or muon), missing transverse momentum and at least four high transverse momentum jets, of which at least one is tagged as coming from a b-quark, is selected. A likelihood fit is used to reconstruct the TeX event kinematics. A Bayesian unfolding procedure is employed to estimate A C at the parton-level. The measured value of the TeX production charge asymmetry is A C = 0.006 ± 0.010, where the uncertainty includes both the statistical and the systematic components. Differential A C measurements as a function of the invariant mass, the rapidity and the transverse momentum of the TeX system are also presented. In addition, A C is measured for a subset of events with large TeX velocity, where physics beyond the Standard Model could contribute. All measurements are consistent with the Standard Model predictions.

G. Aad, E. Abat, B. Abbott, J. Abdallah, A.A. Abdelalim, A. Abdesselam, et al. (2014). Measurement of the top quark pair production charge asymmetry in proton-proton collisions at s√ = 7 TeV using the ATLAS detector. JOURNAL OF HIGH ENERGY PHYSICS, 2, 107-1-107-38 [10.1007/JHEP02(2014)107].

Measurement of the top quark pair production charge asymmetry in proton-proton collisions at s√ = 7 TeV using the ATLAS detector

BELLAGAMBA, LORENZO;BOSCHERINI, DAVIDE;BRUNI, ALESSIA;BRUNI, GRAZIANO;CAFORIO, DAVIDE;DE CASTRO, STEFANO;DI SIPIO, RICCARDO;FABBRI, LAURA;FRANCHINI, MATTEO;GABRIELLI, ALESSANDRO;GIACOBBE, BENEDETTO;MASSA, IGNAZIO GIACOMO;MENGARELLI, ALBERTO;MONZANI, SIMONE;PICCININI, MAURIZIO;RINALDI, LORENZO;ROMANO, MARINO;SBARRA, CARLA;SBRIZZI, ANTONIO;SEMPRINI CESARI, NICOLA;SPIGHI, ROBERTO;VALENTINETTI, SARA;VILLA, MAURO;I. Vivarelli;ZOCCOLI, ANTONIO;
2014

Abstract

This paper presents a measurement of the top quark pair ( TeX ) production charge asymmetry A C using 4.7 fb−1 of proton-proton collisions at a centre-of-mass energy TeX = 7 TeV collected by the ATLAS detector at the LHC. A TeX -enriched sample of events with a single lepton (electron or muon), missing transverse momentum and at least four high transverse momentum jets, of which at least one is tagged as coming from a b-quark, is selected. A likelihood fit is used to reconstruct the TeX event kinematics. A Bayesian unfolding procedure is employed to estimate A C at the parton-level. The measured value of the TeX production charge asymmetry is A C = 0.006 ± 0.010, where the uncertainty includes both the statistical and the systematic components. Differential A C measurements as a function of the invariant mass, the rapidity and the transverse momentum of the TeX system are also presented. In addition, A C is measured for a subset of events with large TeX velocity, where physics beyond the Standard Model could contribute. All measurements are consistent with the Standard Model predictions.
2014
G. Aad, E. Abat, B. Abbott, J. Abdallah, A.A. Abdelalim, A. Abdesselam, et al. (2014). Measurement of the top quark pair production charge asymmetry in proton-proton collisions at s√ = 7 TeV using the ATLAS detector. JOURNAL OF HIGH ENERGY PHYSICS, 2, 107-1-107-38 [10.1007/JHEP02(2014)107].
G. Aad; E. Abat; B. Abbott; J. Abdallah; A.A. Abdelalim; A. Abdesselam; O. Abdinov; B. Abi; M. Abolins; H. Abramowicz; H. Abreu; E. Acerbi; B.S. Achar...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/289924
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