Search for s-channel single top-quark production in proton-proton collisions at root s=8 TeV with the ATLAS detectorVisa övriga samt affilieringar
2015 (Engelska)Ingår i: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 740, s. 118-136Artikel i tidskrift (Refereegranskat) Published
Abstract [en]
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 topquark production cross-section of 14.6 pb at the 95% confidence level. The fit gives a cross-section of sigma(s) = 5.0 +/- 4.3 pb, consistent with the Standard Model expectation.
Ort, förlag, år, upplaga, sidor
2015. Vol. 740, s. 118-136
Nationell ämneskategori
Fysik
Identifikatorer
URN: urn:nbn:se:uu:diva-246191DOI: 10.1016/j.physletb.2014.11.042ISI: 000347046200017OAI: oai:DiVA.org:uu-246191DiVA, id: diva2:792283
Anmärkning
ATLAS Collaboration, for complete list of authors see http://dx.doi.org/10.1016/j.physletb.2014.11.042
2015-03-032015-03-032017-12-04Bibliografiskt granskad