search for single top quark production in the s-channel by the CMS at 8 TeV

Results of the search for single top-quark production in the s-channel in p-p collisions at a center-of-mass energy of 8TeV by the CMS experiment at the LHC will be presented. Leptonic decays mode of top quarks with an electron or muon in the final state are considered . In order to separate the expected signal from background processes, a multivariate discriminant is defined using Boosted Decision Trees. This analysis leads to an upper limit on the cross section of 11.5 Pb, corresponding to 2.1 times the standard model cross section, at 95pct Confidence Level.