Search for FCNC single top-quark production at √s = 7 TeV with the ATLAS detector
| dc.contributor.author | Aad, G. | |
| dc.contributor.author | ATLAS Collaboration, | |
| dc.date.issued | 2012 | |
| dc.description.abstract | A search for the production of single top-quarks via flavour-changing neutral-currents is presented. Data collected with the ATLAS detector at a centre-of-mass energy of √s = 7 TeV, corresponding to an integrated luminosity of 2.05 fb⁻¹, are used. Candidate events with a semileptonic top-quark decay signature are classified as signal- or background-like events by using several kinematic variables as input to a neural network. No signal is observed in the neural network output distribution and a Bayesian upper limit is placed on the production cross-section. The observed upper limit at 95% confidence level on the cross-section multiplied by the t → Wb branching fraction is measured to be σqg→t × B(t → Wb) < 3.9 pb. This upper limit is converted using a model-independent approach into upper limits on the coupling strengths κugt/Λ < 6.9 · 10−³ TeV⁻¹ and κcgt/Λ < 1.6 · 10⁻² TeV⁻¹, where Λ is the new physics scale, and on the branching fractions B(t→ug) < 5.7 · 10−5 and B(t→cg) < 2.7 · 10−4. | |
| dc.description.statementofresponsibility | G. Aad ... P. Jackson ... L. Lee ... A. Petridis ... N. Soni ... M.J. White ... et al. (ATLAS Collaboration) | |
| dc.identifier.citation | Physics Letters B: Nuclear Physics and Particle Physics, 2012; 712(4-5):351-369 | |
| dc.identifier.doi | 10.1016/j.physletb.2012.05.022 | |
| dc.identifier.issn | 0370-2693 | |
| dc.identifier.issn | 1873-2445 | |
| dc.identifier.uri | http://hdl.handle.net/2440/101937 | |
| dc.language.iso | en | |
| dc.publisher | Elsevier | |
| dc.relation.grant | ARC | |
| dc.rights | © 2012 CERN. Published by Elsevier B.V. Open access under CC BY-NC-ND license. | |
| dc.source.uri | https://doi.org/10.1016/j.physletb.2012.05.022 | |
| dc.subject | Top physics; Heavy-quark production; FCNC; Single top quark; | |
| dc.title | Search for FCNC single top-quark production at √s = 7 TeV with the ATLAS detector | |
| dc.title.alternative | Search for FCNC single top-quark production at root s = 7 TeV with the ATLAS detector | |
| dc.type | Journal article | |
| pubs.publication-status | Published |
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