Measurement of the charge asymmetry in highly boosted top-quark pair production in √<i>s</i>=8 TeV <i>pp</i> collision data collected by the ATLAS experiment



Aad, G, Abbott, B, Abdallah, J, Abdinov, O, Abeloos, B, Aben, R, Abolins, M, AbouZeid, OS, Abramowicz, H, Abreu, H
et al (show 2827 more authors) (2016) Measurement of the charge asymmetry in highly boosted top-quark pair production in √<i>s</i>=8 TeV <i>pp</i> collision data collected by the ATLAS experiment. PHYSICS LETTERS B, 756 (6). pp. 52-71.

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Abstract

In the $pp \rightarrow t\bar{t}$ process the angular distributions of top and anti-top quarks are expected to present a subtle difference, which could be enhanced by processes not included in the Standard Model. This Letter presents a measurement of the charge asymmetry in events where the top-quark pair is produced with a large invariant mass. The analysis is performed on 20.3 fb$^{-1}$ of $pp$ collision data at $\sqrt{s} =$ 8 TeV collected by the ATLAS experiment at the LHC, using reconstruction techniques specifically designed for the decay topology of highly boosted top quarks. The charge asymmetry in a fiducial region with large invariant mass of the top-quark pair ($m_{t\bar{t}} > $ 0.75 TeV) and an absolute rapidity difference of the top and anti-top quark candidates within $-$2 $ < |y_t| - |y_{\bar{t}}| <$ 2 is measured to be 4.2 $\pm$ 3.2%, in agreement with the Standard Model prediction at next-to-leading order. A differential measurement in three $t\bar{t}$ mass bins is also presented.

Item Type: Article
Additional Information: 19 pages, plus author list - 36 pages total, 3 figures, 2 tables. Published in Physics Letters B. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2015-10/
Uncontrolled Keywords: hep-ex, hep-ex
Depositing User: Symplectic Admin
Date Deposited: 14 Mar 2017 10:33
Last Modified: 17 Oct 2023 03:04
DOI: 10.1016/j.physletb.2016.02.055
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3006376