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Search for s-channel single top-quark production in proton–proton collisions at \(\sqrt{s}\)=8 TeV with the ATLAS detector
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- 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. TheThis 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.…
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| URN: | urn:nbn:de:bvb:20-opus-139869 |
|---|---|
| Dokumentart: | Artikel / Aufsatz in einer Zeitschrift |
| Institute der Universität: | Fakultät für Physik und Astronomie / Physikalisches Institut |
| Sprache der Veröffentlichung: | Englisch |
| Titel des übergeordneten Werkes / der Zeitschrift (Englisch): | Physics Letters B |
| Erscheinungsjahr: | 2015 |
| Band / Jahrgang: | 740 |
| Seitenangabe: | 118–136 |
| Originalveröffentlichung / Quelle: | PhysicsLetters B 740 (2015) 118–136. doi:10.1016/j.physletb.2014.11.042 |
| DOI: | https://doi.org/10.1016/j.physletb.2014.11.042 |
| Allgemeine fachliche Zuordnung (DDC-Klassifikation): | 5 Naturwissenschaften und Mathematik / 53 Physik / 539 Moderne Physik |
| Freie Schlagwort(e): | ATLAS; electroweak production; s-Channel; top-quark |
| Datum der Freischaltung: | 04.11.2016 |
| Urhebende Körperschaft: | ATLAS Collaboration |
| Lizenz (Deutsch): |  CC BY: Creative-Commons-Lizenz: Namensnennung |