Measurement of the mass difference between top and anti-top quarks in pp collisions at root s=7 TeV using the ATLAS detector
PHYSICS LETTERS B, vol.728, pp.363-379, 2014 (SCI-Expanded)
- Publication Type: Article / Article
- Volume: 728
- Publication Date: 2014
- Doi Number: 10.1016/j.physletb.2013.12.010
- Journal Name: PHYSICS LETTERS B
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Page Numbers: pp.363-379
- Open Archive Collection: AVESIS Open Access Collection
- Middle East Technical University Affiliated: Yes
Abstract
A measurement of the mass difference between top and anti-top quarks is presented. In a 4.7 fb(-1) data sample of proton-proton collisions at root s = 7 TeV recorded with the ATLAS detector at the LHC, events consistent with t (t) over bar production and decay into a single charged lepton final state are reconstructed. For each event, the mass difference between the top and anti-top quark candidate is calculated. A two b-tag requirement is used in order to reduce the background contribution. A maximum likelihood fit to these per-event mass differences yields Delta m = m(t) - m((t) over bar) = 0.67 +/- 0.61 (stat) +/- 0.41 (syst) GeV, consistent with CPT invariance. (C) 2013 The Authors. Published by Elsevier B.V. All rights reserved.