Search for s-channel single top-quark production in proton–proton collisions at with the ATLAS detector
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 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.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States); Argonne National Lab. (ANL), Argonne, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Contributing Organization:
- ATLAS Collaboration
- Grant/Contract Number:
- SC00112704; AC02-06CH11357; AC03-76SF00515; AC02-05CH11231; AC02-98CH10886; AC02-76CH00016; YerPhI; AC03-76SF00098
- OSTI ID:
- 1198344
- Alternate ID(s):
- OSTI ID: 1172094; OSTI ID: 1222948; OSTI ID: 1223104; OSTI ID: 1223278; OSTI ID: 1223279; OSTI ID: 1524008
- Report Number(s):
- BNL-107567-2015-JA; S0370269314008442; PII: S0370269314008442
- Journal Information:
- Physics Letters B, Journal Name: Physics Letters B Vol. 740 Journal Issue: C; ISSN 0370-2693
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- Netherlands
- Language:
- English
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