TY  - JOUR
T1  - Search for s-channel single top-quark production in proton–proton collisions at \(\sqrt{s}\)=8 TeV with the ATLAS detector
T2  - Physics Letters B
N2  - 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.
KW  - s-Channel
KW  - electroweak production
KW  - top-quark
KW  - ATLAS
Y1  - 2015
UR  - https://opus.bibliothek.uni-wuerzburg.de/frontdoor/index/index/docId/13986
UR  - https://nbn-resolving.org/urn:nbn:de:bvb:20-opus-139869
VL  - 740
ER  -