# Search for s channel single top quark production in pp collisions at sqrt(s) = 7 and 8 TeV

Abstract : A search is presented for single top quark production in the s channel in proton-proton collisions with the CMS detector at the CERN LHC in decay modes of the top quark containing a muon or an electron in the final state. The signal is extracted through a maximum-likelihood fit to the distribution of a multivariate discriminant defined using boosted decision trees to separate the expected signal contribution from background processes. Data collected at centre-of-mass energies of 7 and 8 TeV yield cross sections of 7.1 +/- 8.1 pb and 13.4 +/- 7.3 pb, respectively, and a best fit value of 2.0 +/- 0.9 for the combined ratio of the measured and expected values. The signal significance is 2.5 standard deviations, and the upper limit on the rate relative to the standard model expectation is 4.7 at 95% confidence level.
Type de document :
Article dans une revue
Journal of High Energy Physics, Springer Verlag (Germany), 2016, 09, pp.027. 〈10.1007/JHEP09(2016)027〉

http://hal.in2p3.fr/in2p3-01285309
Contributeur : Sylvie Flores <>
Soumis le : mercredi 9 mars 2016 - 07:38:05
Dernière modification le : jeudi 10 mai 2018 - 02:00:34

### Citation

V. Khachatryan, M. Besançon, F. Couderc, M. Dejardin, D. Denegri, et al.. Search for s channel single top quark production in pp collisions at sqrt(s) = 7 and 8 TeV. Journal of High Energy Physics, Springer Verlag (Germany), 2016, 09, pp.027. 〈10.1007/JHEP09(2016)027〉. 〈in2p3-01285309〉

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