Measurement of the W-boson helicity in top-quark decays from t(t)over-bar production in lepton plus jets events in pp collisions at root s=7 TeV
Contribuinte(s) |
Universidade Estadual Paulista (UNESP) |
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Data(s) |
03/12/2014
03/12/2014
24/10/2013
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Resumo |
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) The W-boson helicity fractions in top-quark decays are measured with t (t) over bar events in the lepton+jets final state, using proton-proton collisions at a centre-of-mass energy of 7 TeV, collected in 2011 with the CMS detector at the LHC. The data sample corresponds to an integrated luminosity of 5.0 fb(-1). The measured fractions of longitudinal, left-, and right-handed helicity are F-0 = 0.682 +/- 0.030 (stat.) +/- 0.033 (syst.), F-L = 0.310 +/- 0.022 (stat.) +/- 0.022 (syst.), and F-R = 0.008 +/- 0.012 (stat.) +/- 0.014 (syst.), consistent with the standard model predictions. The measured fractions are used to probe the existence of anomalous Wtb couplings. Exclusion limits on the real components of the anomalous couplings g(L), g(R) are also derived. |
Formato |
45 |
Identificador |
http://dx.doi.org/10.1007/JHEP10(2013)167 Journal Of High Energy Physics. New York: Springer, n. 10, 45 p., 2013. 1029-8479 http://hdl.handle.net/11449/111321 10.1007/JHEP10(2013)167 WOS:000326190800001 WOS000326190800001.pdf |
Idioma(s) |
eng |
Publicador |
Springer |
Relação |
Journal of High Energy Physics |
Direitos |
openAccess |
Palavras-Chave | #Hadron-Hadron Scattering #Top physics |
Tipo |
info:eu-repo/semantics/article |