Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at s√ = 8 TeV
dc.contributor.author | Aad, Georges | pt_BR |
dc.contributor.author | Silveira, Gustavo Gil da | pt_BR |
dc.contributor.author | ATLAS Collaboration | pt_BR |
dc.contributor.author | CMS Collaboration | pt_BR |
dc.date.accessioned | 2021-01-14T04:11:50Z | pt_BR |
dc.date.issued | 2020 | pt_BR |
dc.identifier.issn | 1029-8479 | pt_BR |
dc.identifier.uri | http://hdl.handle.net/10183/217346 | pt_BR |
dc.description.abstract | The combination of measurements of the W boson polarization in top quark decays performed by the ATLAS and CMS collaborations is presented. The measurements are based on proton-proton collision data produced at the LHC at a centre-of-mass energy of 8 TeV, and corresponding to an integrated luminosity of about 20 fb−1 for each experiment. The measurements used events containing one lepton and having different jet multiplicities in the final state. The results are quoted as fractions of W bosons with longitudinal (F0), left-handed (FL), or right-handed (FR) polarizations. The resulting combined measurements of the polarization fractions are F0 = 0.693 ± 0.014 and FL = 0.315 ± 0.011. The fraction FR is calculated from the unitarity constraint to be FR = −0.008 ± 0.007. These results are in agreement with the standard model predictions at next-to-next-to-leading order in perturbative quantum chromodynamics and represent an improvement in precision of 25 (29)% for F0 (FL) with respect to the most precise single measurement. A limit on anomalous right-handed vector (VR), and left- and right-handed tensor (gL, gR) tWb couplings is set while fixing all others to their standard model values. The allowed regions are [−0.11, 0.16] for VR, [−0.08, 0.05] for gL, and [−0.04, 0.02] for gR, at 95% confidence level. Limits on the corresponding Wilson coefficients are also derived. | en |
dc.format.mimetype | application/pdf | pt_BR |
dc.language.iso | eng | pt_BR |
dc.relation.ispartof | The journal of high energy physics. Trieste. No. 8 (Aug. 2020), 51, 66 p. | pt_BR |
dc.rights | Open Access | en |
dc.subject | Hadron-Hadron scattering (experiments) | en |
dc.subject | Aceleradores de partículas | pt_BR |
dc.subject | Colisões proton-proton | pt_BR |
dc.subject | Top physics | en |
dc.subject | Bosons W | pt_BR |
dc.title | Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at s√ = 8 TeV | pt_BR |
dc.type | Artigo de periódico | pt_BR |
dc.identifier.nrb | 001120369 | pt_BR |
dc.type.origin | Estrangeiro | pt_BR |
Este item está licenciado na Creative Commons License
![](/themes/Mirage2Novo//images/lume/cc.png)
-
Artigos de Periódicos (39351)Ciências Exatas e da Terra (5974)