Mullier, Geoffrey; Haug, Sigve; Weber, Michael; Meloni, Federico; Cervelli, Alberto; Beck, Hans Peter; Stucci, Stefania; Ereditato, Antonio (2016). Measurement of the production cross-section of a single top quark in association with a W boson at 8 TeV with the ATLAS experiment. Journal of High Energy Physics, 2016(1) Springer 10.1007/JHEP01(2016)064
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1510.03752.pdf - Accepted Version Available under License Creative Commons: Attribution (CC-BY). Download (1MB) | Preview |
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10.1007_JHEP01(2016)064.pdf - Published Version Available under License Creative Commons: Attribution (CC-BY). Download (2MB) | Preview |
The cross-section for the production of a single top quark in association with a W boson in proton--proton collisions at √s=8 TeV 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 Wt signal is separated from the backgrounds using boosted decision trees, each of which combines a number of discriminating variables into one classifier. Production of Wt events is observed with a significance of 7.7σ . The cross-section is extracted in a profile likelihood fit to the classifier output distributions. The Wt cross-section, inclusive of decay modes, is measured to be 23.0±1.3 (stat.) +3.2 −3.5 (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 |η|<2.5 , one jet with p T >20 GeV and |η|<2.5 , and E miss T >20 GeV, including both Wt and top-quark pair events as signal. The measured value of the fiducial cross-section is 0.85±0.01 (stat.) +0.06 −0.07 (syst.)±0.03 (lumi.) pb.
Item Type: |
Journal Article (Original Article) |
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Division/Institute: |
08 Faculty of Science > Physics Institute > Laboratory for High Energy Physics (LHEP) |
UniBE Contributor: |
Haug, Sigve, Weber, Michele, Beck, Hans Peter |
Subjects: |
500 Science > 530 Physics 500 Science > 510 Mathematics |
ISSN: |
1029-8479 |
Publisher: |
Springer |
Language: |
English |
Submitter: |
Annette Krebs-Wegenast |
Date Deposited: |
15 Aug 2017 09:31 |
Last Modified: |
05 Dec 2022 15:05 |
Publisher DOI: |
10.1007/JHEP01(2016)064 |
Additional Information: |
Kollaboration - Es sind nur die Berner Autoren namentlich erwähnt. |
BORIS DOI: |
10.7892/boris.100008 |
URI: |
https://boris.unibe.ch/id/eprint/100008 |
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