Measurement of the Charge Asymmetry in Highly Boosted Top-Quark Pair Production in √s̅ = 8 TeV pp Collision Data Collected by the ATLAS Experiment

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Measurement of the Charge Asymmetry in Highly Boosted Top-Quark Pair Production in √s̅ = 8 TeV pp Collision Data Collected by the ATLAS Experiment

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Title: Measurement of the Charge Asymmetry in Highly Boosted Top-Quark Pair Production in √s̅ = 8 TeV pp Collision Data Collected by the ATLAS Experiment
Author(s):
Aad, G.;
Abbott, B.;
Abdallah, J.;
Abdinov, O.;
Abeloos, B.;
Aben, R.;
Abolins, M.;
Izen, Joseph M.;
Leyton, Michael;
Meirose, Bernhard;
Namasivayam, Harisankar;
Reeves, Kendall;
ATLAS Collaboration
Date Created: 2016-03-02
Item Type: Article
Keywords: Show Keywords
Abstract: In the pp → tt̅ 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 √s̅ = 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{tt̅} > 0.75 TeV) and an absolute rapidity difference of the top and anti-top quark candidates within ⁻² < |y{t} - |y{t̅}| < ² is measured to be 4.2 ± 3.2% in agreement with the Standard Model prediction at next-to-leading order. A differential measurement in three tt̅ mass bins is also presented.mass bins is also presented. ⊕
Publisher: Elsevier Science BV
ISSN: 0370-2693
Source: Physics Letters B
Link to Related Resource: http://dx.doi.org/10.1016/j.physletb.2016.02.055
Persistent Link: http://hdl.handle.net/10735.1/5386
Bibliographic Citation: Aad, G., B. Abbott, J. Abdallah, O. Abdinov, et al. 2016. "Measurement of the charge asymmetry in highly boosted top-quark pair production in root s=8 TeV pp collision data collected by the ATLAS experiment." Physics Letters B 756, doi: 10.1016/j.physletb.2016.02.055
Terms of Use: CC BY 4.0 (Attribution)
©2016 CERN, for the ATLAS Collaboration

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