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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
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
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Number of Authors: 2936
2014 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 728, 363-379 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2014. Vol. 728, 363-379 p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-143547DOI: 10.1016/j.physletb.2013.12.010ISI: 000330556000059Scopus ID: 2-s2.0-84903785104OAI: oai:DiVA.org:kth-143547DiVA: diva2:707591
Note

QC 20140325. Author count:2936

Available from: 2014-03-25 Created: 2014-03-25 Last updated: 2017-12-05Bibliographically approved

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