Measurement of the t-channel single top-quark production cross section in pp collisions at root s=7 TeV with the ATLAS detector
By S. Chatrchyan, M. Nikolic, R. Erbacher, C. A. C. Montoya, M. Maggi, W. Carvalho, M. Górski, D. Kotlinski, J. Anderson, B. Ujvari and 2,185 more. 2012
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We report a measurement of the cross section of single top-quark production in the t-channel using 1.04 fb(-1) of pp collision data at root s = 7 TeV recorded with the ATLAS detector at the LHC. Selected events feature one electron or muon, missing transverse momentum, and two or three jets, exactly one of them identified as originating from a b quark. The cross section is measured by fitting the distribution of a multivariate discriminant constructed with a neural network, yielding sigma(t) = 83 +/- 4 (stat.)(-19)(+20) (syst.) pb, which is in good agreement with the prediction of the Standard Model. Using the ratio of the measured to the theoretically predicted cross section and assuming that the top-quark-related CKM matrix elements obey the relation vertical bar V-tb vertical bar >> vertical bar V-ts vertical bar, vertical bar V-td vertical bar, the coupling strength at the W-t-b vertex is determined to be vertical bar V-tb vertical bar = 1.13(-0.13)(+0.14). If it is assumed that vertical bar V-tb vertical bar 0.75 is obtained at the 95% confidence level. (C) 2012 CERN. Published by Elsevier B.V. All rights reserved.
Subfields: Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/69b898dc76d5e7b5ce025256d26087fa7d4ed102
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In Nuclear and High Energy Physics
Citations in the corpus
- Observation of the Associated Production of a Single Top Quark and a W Boson in pp Collisions at √s=8 TeV (2014, methodology): “This Letter presents the first observation of tW production at a significance of at least 5 σ, using data collected with the CMS experiment in pp collisions at √ s = 8 TeV and corresponding to an integrated luminosity of 12.2 fb−1.”
- Performance of b-jet identification in the ATLAS experiment (2015, methodology): “In the dilepton analysis an uncertainty of 50% is assumed, while in the single-lepton analysis the uncertainty is obtained by comparing the baseline result with the b-jet tagging efficiencies measured in events in which the requirement of an isolated electron is replaced by that of a jet with a larg”