%0 Journal Article %1 collaboration2015evidence %A Collaboration, ATLAS %D 2015 %K ATLAS MatrixElementMethod experiment singletop %R 10.1016/j.physletb.2016.03.017 %T 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 %U http://arxiv.org/abs/1511.05980 %X 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 $\sigma_s=4.8\pm0.8$(stat.)$^+1.6_-1.3$(syst.) pb, which is consistent with the Standard Model expectation. The expected significance for the analysis is 3.9 standard deviations.

@article{collaboration2015evidence, abstract = {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 $\sigma_s=4.8\pm0.8$(stat.)$^{+1.6}_{-1.3}$(syst.) pb, which is consistent with the Standard Model expectation. The expected significance for the analysis is 3.9 standard deviations.}, added-at = {2016-10-28T15:15:17.000+0200}, author = {Collaboration, ATLAS}, biburl = {https://www.bibsonomy.org/bibtex/2e99337b8cd8e2dca2306ddae79572b6f/omkind}, description = {Evidence for single top-quark production in the $s$-channel in proton-proton collisions at $\sqrt{s}=$8 TeV with the ATLAS detector using the Matrix Element Method}, doi = {10.1016/j.physletb.2016.03.017}, interhash = {7d1ab18205e88421f0b1458e43a4c841}, intrahash = {e99337b8cd8e2dca2306ddae79572b6f}, keywords = {ATLAS MatrixElementMethod experiment singletop}, note = {cite arxiv:1511.05980Comment: 16 pages plus author list + cover page (34 pages total), 4 figures, 2 tables, submitted to PLB. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2015-01/}, timestamp = {2016-10-28T15:27:42.000+0200}, title = {Evidence for single top-quark production in the $s$-channel in proton-proton collisions at $\sqrt{s}=$8 TeV with the ATLAS detector using the Matrix Element Method}, url = {http://arxiv.org/abs/1511.05980}, year = 2015 }