Publication
Measurement of the production cross-section of a single top quark in association with a $W$ boson at 8 TeV with the ATLAS experiment
| dc.contributor.author | ATLAS collaboration (2871 authors) | |
| dc.contributor.author | Aguilar-Saavedra, Juan Antonio | |
| dc.contributor.author | Amor Dos Santos, Susana Patricia | |
| dc.contributor.author | Anjos, Nuno | |
| dc.contributor.author | Araque, Juan Pedro | |
| dc.contributor.author | Cantrill, Robert | |
| dc.contributor.author | Carvalho, João | |
| dc.contributor.author | Castro, Nuno Filipe | |
| dc.contributor.author | Conde Muiño, Patricia | |
| dc.contributor.author | Da Cunha Sargedas De Sousa, Mario Jose | |
| dc.contributor.author | Fiolhais, Miguel | |
| dc.contributor.author | Galhardo, Bruno | |
| dc.contributor.author | Gomes, Agostinho | |
| dc.contributor.author | Gonçalo, Ricardo | |
| dc.contributor.author | Jorge, Pedro | |
| dc.contributor.author | Lopes, Lourenco | |
| dc.contributor.author | Machado Miguens, Joana | |
| dc.contributor.author | Maio, Amélia | |
| dc.contributor.author | Maneira, José | |
| dc.contributor.author | Onofre, António | |
| dc.contributor.author | Palma, Alberto | |
| dc.contributor.author | Pedro, Rute | |
| dc.contributor.author | Pina, João Antonio | |
| dc.contributor.author | Santos, Helena | |
| dc.contributor.author | Saraiva, João | |
| dc.contributor.author | Silva, José | |
| dc.contributor.author | Tavares Delgado, Ademar | |
| dc.contributor.author | Veloso, Filipe | |
| dc.contributor.author | Wolters, Helmut | |
| dc.date.accessioned | 2019-02-04T08:22:37Z | |
| dc.date.available | 2019-02-04T08:22:37Z | |
| dc.date.issued | 2016-01-11 | |
| dc.date.updated | 2019-02-04T08:22:36Z | |
| dc.description.abstract | The cross-section for the production of a single top quark in association with a W boson in proton-proton collisions at $ \sqrt{s}=8\mathrm{T}\mathrm{e}\mathrm{V} $ 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 7.7σ. 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.)$_{− 3.5}^{+ 3.2}$ (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 |η| < 2.5, one jet with p$_{T}$ > 20 GeV and |η| < 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 ± 0.01(stat.)$_{− 0.07}^{+ 0.07}$ (syst.)±0.03(lumi.) pb. | |
| dc.description.version | Peer Reviewed | |
| dc.identifier | JHEP 1601 (2016) 064; DOI 10.1007/JHEP01(2016)064 | |
| dc.identifier.uri | http://dx.doi.org/10.1007/JHEP01(2016)064 | |
| dc.identifier.uri | http://hdl.handle.net/10400.26/26952 | |
| dc.language.iso | eng | |
| dc.title | Measurement of the production cross-section of a single top quark in association with a $W$ boson at 8 TeV with the ATLAS experiment | |
| dc.type | journal article | |
| dspace.entity.type | Publication | |
| rcaap.rights | openAccess | pt |
| rcaap.type | article |