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https://hdl.handle.net/10316/109637| Title: | Measurement of the mass difference between top and anti-top quarks in pp collisions at √s=7 TeV using the ATLAS detector | Authors: | Santos, S. P. Amor dos Carvalho, J. Fiolhais, M. C. N. Galhardo, B. Veloso, F. Wolters, H. Oliveira, M. ATLAS Collaboration |
Issue Date: | 2014 | Publisher: | Elsevier | Serial title, monograph or event: | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Volume: | 728 | 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 tt¯ 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≡mt−mt¯=0.67±0.61(stat)±0.41(syst) GeV, consistent with CPT invariance. | URI: | https://hdl.handle.net/10316/109637 | DOI: | 10.1016/j.physletb.2013.12.010 | Rights: | openAccess |
| Appears in Collections: | FCTUC Física - Artigos em Revistas Internacionais |
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| File | Description | Size | Format | |
|---|---|---|---|---|
| Measurement of the mass difference between top and anti-top quarks in pp collisions at √s=7 TeV using the ATLAS detector.pdf | 1.14 MB | Adobe PDF | View/Open |
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