/ hep-ex CERN-PH-EP-2013-171

Measurement of the mass difference between top and anti-top quarks in pp collisions at $\sqrt(s) = 7$ TeV using the ATLAS detector

Published in: Phys.Lett.
Year: 2014
Vol.: B728
Page No: 363-379
Pages: 17
Year: 2014

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 √s = 7 TeV recorded with the ATLAS detector at the LHC, events consistent with ttbar 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 $\Delta m ≣ m_t - m_{\bar{t}}$ = 0.67 ± 0.61(stat) ± 0.41(syst) GeV, consistent with CPT invariance.

Note: 6 pages plus author list (22 pages total), 3 figures, 2 tables, submitted to Physics Letter B, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2012-06/

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DOI: 10.1016/j.physletb.2013.12.010