Search for $s$-channel single top-quark production in proton–proton collisions at $\sqrt s=8$ TeV with the ATLAS detector
(2015) Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. 740, p. 118 (2015)
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- 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 marc: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.
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Tanasijczuk, A. J., ATLAS, & et al. (2015). Search for $s$-channel single top-quark production in proton–proton collisions at $\sqrt s=8$ TeV with the ATLAS detector. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 740, 118. https://doi.org/10.1016/j.physletb.2014.11.042 (Original work published 2015)