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Evidence for single top-quark production in the s-channel in proton-proton collisions at s=8 TeV with the ATLAS detector using the Matrix Element Method
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Evidence for single top-quark production in the s-channel in proton-proton collisions at s=8 TeV with the ATLAS detector using the Matrix Element Method

G. Aad, B. Abbott, J. Abdallah, O. Abdinov, R. Aben, M. Abolins, O.S. AbouZeid, H. Abramowicz, H. Abreu, R. Abreu, …
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 卷.756, 頁碼.228-246
05/2016
DOI: https://doi.org/10.1016/j.physletb.2016.03.017

摘要

Nuclear and High Energy Physics
This Letter presents evidence for single top-quark production in the s-channel using proton-proton collisions at a centre-of-mass energy of 8 TeV with the ATLAS detector at the CERN Large Hadron Collider. The analysis is performed on events containing one isolated electron or muon, large missing transverse momentum and exactly two b-tagged jets in the final state. The analysed data set corresponds to an integrated luminosity of 20.3 fb -1 . The signal is extracted using a maximum-likelihood fit of a discriminant which is based on the matrix element method and optimized in order to separate single-top-quark s-channel events from the main background contributions, which are top-quark pair production and W boson production in association with heavy-flavour jets. The measurement leads to an observed signal significance of 3.2 standard deviations and a measured cross-section of σs=4.8±0.8(stat.)-1.3+1.6(syst.) pb, which is consistent with the Standard Model expectation. The expected significance for the analysis is 3.9 standard deviations.

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