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

Abstract

In the pp→tt 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 √s=8TeV 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 (mtt>0.75 TeV) and an absolute rapidity difference of the top and anti-top quark candidates within -2<|yt|-|yt|<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 tt- mass bins is also presented.

Metadata

Item Type:	Article
Authors/Creators:	Aad, G Abbott, B Abdallah, J Abdinov, O Abeloos, B Aben, R Abolins, M AbouZeid, OS Abramowicz, H Abreu, H Abreu, R Abulaiti, Y Acharya, BS Adamczyk, L Adams, DL Adelman, J Adomeit, S Adye, T Affolder, AA Agatonovic-Jovin, T Agricola, J Aguilar-Saavedra, JA Ahlen, SP Ahmadov, F Aielli, G Akerstedt, H Åkesson, TPA Akimov, AV Alberghi, GL Albert, J Albrand, S Alconada Verzini, MJ Aleksa, M Aleksandrov, IN Alexa, C Alexander, G Alexopoulos, T Alhroob, M Alimonti, G Alison, J Alkire, SP Allbrooke, BMM Allen, BW Allport, PP Aloisio, A Alonso, A Alonso, F Alpigiani, C Alvarez Gonzalez, B Álvarez Piqueras, D Alviggi, MG Amadio, BT Amako, K Amaral Coutinho, Y Amelung, C Amidei, D Amor Dos Santos, SP Amorim, A Amoroso, S Amram, N Amundsen, G Anastopoulos, C Ancu, LS Andari, N Andeen, T Anders, CF Anders, G Anders, JK Anderson, KJ Andreazza, A Andrei, V Angelidakis, S Angelozzi, I Anger, P Angerami, A Anghinolfi, F Anisenkov, AV Anjos, N Annovi, A Antonelli, M Antonov, A Antos, J Anulli, F Aoki, M
Copyright, Publisher and Additional Information:	© 2016 CERN for the benefit of the ATLAS Collaboration. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Dates:	Published: 10 May 2016 Published (online): 2 March 2016 Accepted: 24 February 2016
Institution:	The University of Sheffield
Academic Units:	The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Mechanical Engineering (Sheffield) The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield)
Depositing User:	Symplectic Sheffield
Date Deposited:	03 Nov 2016 16:22
Last Modified:	03 Nov 2016 16:22
Published Version:	https://doi.org/10.1016/j.physletb.2016.02.055
Status:	Published
Publisher:	Elsevier
Refereed:	Yes
Identification Number:	10.1016/j.physletb.2016.02.055
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:106431

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

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