Search for s-channel single top-quark production in proton–proton collisions at \(\sqrt{s}\)=8 TeV with the ATLAS detector
Please always quote using this URN: urn:nbn:de:bvb:20-opus-139869
- 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.…
| URN: | urn:nbn:de:bvb:20-opus-139869 |
|---|---|
| Document Type: | Journal article |
| Faculties: | Fakultät für Physik und Astronomie / Physikalisches Institut |
| Language: | English |
| Parent Title (English): | Physics Letters B |
| Year of Completion: | 2015 |
| Volume: | 740 |
| Pagenumber: | 118–136 |
| Source: | 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 |
| Dewey Decimal Classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 539 Moderne Physik |
| Tag: | ATLAS; electroweak production; s-Channel; top-quark |
| Release Date: | 2016/11/04 |
| Creating Corporation: | ATLAS Collaboration |
| Licence (German): |  CC BY: Creative-Commons-Lizenz: Namensnennung |