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Title: Search for s-channel single top-quark production in proton-proton collisions at √ s=8 TeV 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. The 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.
Authors:
 [1] ;  [2] ;  [3] ;  [4]
  1. Univ. of Aix-Marselle (France)
  2. Univ. of Oklahoma, Norman, OK (United States)
  3. Academia Sinica, Taipei (Taiwan)
  4. Univ. of Paris-Sud, Orsay (France). et al.
Publication Date:
OSTI Identifier:
1198344
Report Number(s):
BNL-107567-2015-JA
Journal ID: ISSN 0370-2693; KA1101021
Grant/Contract Number:
SC00112704; AC02-06CH11357; AC03-76SF00515; AC02-05CH11231; AC02-98CH10886; AC02-76CH00016; YerPhI; AC03-76SF00098
Type:
Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 740; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Research Org:
Brookhaven National Laboratory (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 Org:
USDOE Office of Science (SC)
Contributing Orgs:
ATLAS Collaboration
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ATLAS; top-quark; Electroweak production; s-Channel; electroweak production; s-channel