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https://hdl.handle.net/10316/109260
Title: | Search for s-channel single top-quark production in proton-proton collisions at √s=8 TeV with the ATLAS detector | Authors: | Santos, S. P. Amor dos Carvalho, J. Fiolhais, M. C. N. Galhardo, B. Veloso, F. Wolters, H. ATLAS Collaboration |
Keywords: | ATLAS; Top-quark; Electroweak production; s-Channel | Issue Date: | 2015 | Publisher: | Elsevier | Serial title, monograph or event: | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Volume: | 740 | Abstract: | This Letter presents a search at the LHC for s-channel single top-quark production in proton-proton collisions at a centre-of-mass energy of 8 TeV. The analyzed data set was recorded by the ATLAS detector and corresponds to an integrated luminosity of 20.3 fb-1. Selected events contain one charged lepton, large missing transverse momentum and exactly two b-tagged jets. A multivariate event classifier based on boosted decision trees is developed to discriminate s-channel single top-quark events from the main background contributions. The signal extraction is based on a binned maximum-likelihood fit of the output classifier distribution. The analysis leads to an upper limit on the s-channel single top-quark production cross-section of 14.6 pb at the 95% confidence level. The fit gives a cross-section of σs = 5.0 ± 4.3 pb, consistent with the Standard Model expectation. | URI: | https://hdl.handle.net/10316/109260 | DOI: | 10.1016/j.physletb.2014.11.042 | Rights: | openAccess |
Appears in Collections: | FCTUC Física - Artigos em Revistas Internacionais |
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Search for s-channel single top-quark production in proton-proton collisions at √s=8 TeV with the ATLAS detector.pdf | 1.35 MB | Adobe PDF | View/Open |
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