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Measurement of the production cross-section of a single top quark in association with a W boson at 8 TeV with the ATLAS experiment
KTH, School of Engineering Sciences (SCI), Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0002-8913-0981
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Number of Authors: 2871
2016 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 1, 064Article in journal (Refereed) PublishedText
Abstract [en]

The cross-section for the production of a single top quark in association with a W boson in proton-proton collisions at is measured. The dataset corresponds to an integrated luminosity of 20.3 fb(-1), collected by the ATLAS detector in 2012 at the Large Hadron Collider at CERN. Events containing two leptons and one central b-jet are selected. The W t signal is separated from the backgrounds using boosted decision trees, each of which combines a number of discriminating variables into one classifier. Production of W t events is observed with a significance of 7.7 sigma. The cross-section is extracted in a profile likelihood fit to the classifier output distributions. The W t cross-section, inclusive of decay modes, is measured to be 23.0 +/- 1.3(stat.) (-aEuro parts per thousand 3.5) (+ 3.2) (syst.)+/- 1.1(lumi.) pb. The measured cross-section is used to extract a value for the CKM matrix element |V (tb) | of 1.01 +/- 0.10 and a lower limit of 0.80 at the 95% confidence level. The cross-section for the production of a top quark and a W boson is also measured in a fiducial acceptance requiring two leptons with p (T) > 25 GeV and |eta| < 2.5, one jet with p (T) > 20 GeV and |eta| < 2.5, and E (T) (miss) > 20 GeV, including both W t and top-quark pair events as signal. The measured value of the fiducial cross-section is 0.85 +/- A 0.01(stat.) (-aEuro parts per thousand 0.07) (+ 0.07) (syst.)+/- 0.03(lumi.) pb.

Place, publisher, year, edition, pages
Springer , 2016. no 1, 064
Keyword [en]
Hadron-Hadron scattering, Top physics
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-183013DOI: 10.1007/JHEP01(2016)064ISI: 000368174800001ScopusID: 2-s2.0-84954510276OAI: oai:DiVA.org:kth-183013DiVA: diva2:906629
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QC 20160224

Available from: 2016-02-24 Created: 2016-02-24 Last updated: 2016-02-24Bibliographically approved

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Lund-Jensen, BengtSidebo, EdvinStrandberg, Jonas
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