Measurement of the mass difference between top and anti-top quarks in pp collisions at √s = 7 TeV using the ATLAS detector
A measurement of the mass difference between top and anti-top quarks is presented. In a 4.7 fb[superscript −1] data sample of proton–proton collisions at √s = 7 TeV recorded with the ATLAS detector at the LHC, events consistent with t[¯ over t] production and decay into a single charged lepton final...
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| Format: | Article |
| Language: | en_US |
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Elsevier
2014
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| Online Access: | http://hdl.handle.net/1721.1/87569 https://orcid.org/0000-0002-7586-7253 |
| Summary: | A measurement of the mass difference between top and anti-top quarks is presented. In a 4.7 fb[superscript −1] data sample of proton–proton collisions at √s = 7 TeV recorded with the ATLAS detector at the LHC, events consistent with t[¯ over t] 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 Δm ≡ m[subscript t] − m[subscript ¯ over t] = 0.67 ± 0.61 (stat) ± 0.41 (syst) GeV, consistent with CPT invariance. |
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