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Measurement of the mass difference between top and anti-top quarks in pp collisions at root s=7 TeV using the ATLAS detector

Research output: Contribution to Journal/Magazine › Journal article › peer-review

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  • The ATLAS collaboration
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<mark>Journal publication date</mark>20/01/2014
<mark>Journal</mark>Physics Letters B
Volume728
Number of pages17
Pages (from-to)363-379
Publication StatusPublished
<mark>Original language</mark>English

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.

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This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Funded by SCOAP3.