2014
DOI: 10.1007/jhep02(2014)107
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Measurement of the top quark pair production charge asymmetry in proton-proton collisions at $ \sqrt{s} $ = 7 TeV using the ATLAS detector

Abstract: This paper presents a measurement of the top quark pair (tt) production charge asymmetry A C using 4.7 fb −1 of proton-proton collisions at a centre-of-mass energy √ s = 7 TeV collected by the ATLAS detector at the LHC. A tt-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 tt event kinematics. A Bayesian… Show more

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Cited by 48 publications
(39 citation statements)
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“…The agreement of the A C measurements [5,6] with the SM predictions [7,8] brought some disappointment. Although the LHC tt charge asymmetry is a different observable (it is a forward-central rather than a FB asymmetry), it is somewhat correlated to A FB in the SM and simple extensions [9,10].…”
Section: Introductionmentioning
confidence: 99%
See 1 more Smart Citation
“…The agreement of the A C measurements [5,6] with the SM predictions [7,8] brought some disappointment. Although the LHC tt charge asymmetry is a different observable (it is a forward-central rather than a FB asymmetry), it is somewhat correlated to A FB in the SM and simple extensions [9,10].…”
Section: Introductionmentioning
confidence: 99%
“…1 (left). LHC measurements at centre of mass (CM) energies of 7 TeV [5,6,25,26] and 8 TeV [27-31] 1 do not exhibit a clear trend (see the right panel) but there is some shift towards measurements below the SM prediction. In particular, among the naive combination of A C measurements at 7 TeV, the naive combination at 8 TeV, and the two A C official combinations at 7 and 8 TeV, three of these four measurements are found below the SM.…”
Section: Introductionmentioning
confidence: 99%
“…Measurements of the charge asymmetry with 7 TeV data. Data compared to simulation normalized in control regions for the distribution as a function of ∆|y|[157] (left) and distribution of A C as a function of m tt after unfolding, compared with the SM predictions (green lines) and the predictions for a colour-octet axigluon with a mass of 300 GeV (red lines) and 7000 GeV (blue lines)[158] (right).…”
mentioning
confidence: 99%
“…Recent calculations at NLO, including electroweak corrections, predicted A C = 1.23 ± 0.05% at the LHC ( √ s = 7 TeV for pp collisions)(59). ATLAS and CMS measurements of the charge asymmetry (at √ s = 7 utilizing 5 fb −1 of data) have not observed any significant deviation from the SM(Figure 4(75,76,77,78,79)). ATLAS and CMS have also performed differential measurements as a function of m tt , rapidity, and transverse momentum, and have not observed deviations from the SM.…”
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confidence: 91%