# Search for s-channel single top-quark production in proton-proton collisions at $\sqrt{s}$=8 TeV with the ATLAS detector

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 $\sigma_s$=5.0$\pm$4.3 pb, consistent with the Standard Model expectation.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-01071039
Contributor : Danielle Cristofol <>
Submitted on : Friday, October 3, 2014 - 8:40:46 AM
Last modification on : Thursday, February 25, 2021 - 10:58:33 AM

### Citation

G. Aad, L. Alio, M. Barbero, C. Bertella, J. C. Clémens, et al.. Search for s-channel single top-quark production in proton-proton collisions at $\sqrt{s}$=8 TeV with the ATLAS detector. Physics Letters B, Elsevier, 2015, 740, pp.118-136. ⟨10.1016/j.physletb.2014.11.042⟩. ⟨in2p3-01071039⟩

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