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Search for s-channel single top-quark production in proton-proton collisions at root s=8 TeV with the ATLAS detector
KTH, Skolan för teknikvetenskap (SCI), Fysik, Partikel- och astropartikelfysik.
KTH, Skolan för teknikvetenskap (SCI), Fysik, Partikel- och astropartikelfysik.
KTH, Skolan för teknikvetenskap (SCI), Fysik, Partikel- och astropartikelfysik.
Vise andre og tillknytning
Rekke forfattare: 28952015 (engelsk)Inngår i: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 740, s. 118-136Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
Elsevier, 2015. Vol. 740, s. 118-136
Emneord [en]
ATLAS, Top quark, Electroweak production, s-Channel
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-160435DOI: 10.1016/j.physletb.2014.11.042ISI: 000347046200017Scopus ID: 2-s2.0-84915749676OAI: oai:DiVA.org:kth-160435DiVA, id: diva2:789544
Forskningsfinansiär
Knut and Alice Wallenberg Foundation
Merknad

QC 20150219

Tilgjengelig fra: 2015-02-19 Laget: 2015-02-19 Sist oppdatert: 2017-12-04bibliografisk kontrollert

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Jovicevic, JelenaKuwertz, EmmaLund-Jensen, BengtMorley, AnthonyStrandberg, Jonas
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