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Measurement of the W boson helicity in events with a single reconstructed top quark in pp collisions at vs = 8 TeV

Abstract: A measurement of the W boson helicity is presented, where the W boson originates from the decay of a top quark produced in pp collisions. The event selection, optimized for reconstructing a single top quark in the final state, requires exactly one isolated lepton (muon or electron) and exactly two jets, one of which is likely to originate from the hadronization of a bottom quark. The analysis is performed using data recorded at a center-of-mass energy of 8 TeV with the CMS detector at the CERN LHC in 2012. The data sample corresponds to an integrated luminosity of 19.7 fb-1. The measured helicity fractions are FL = 0.298 ± 0.028 (stat) ± 0.032(syst), F0 = 0.720 ± 0.039 (stat) ± 0.037(syst), and FR = -0.018 ± 0.019 (stat) ± 0.011(syst). These results are used to set limits on the real part of the tWb anomalous couplings, gL and gR.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Fuente: Journal of High Energy Physics, Vol. 2015, Num. 1, Art. Num. 53

Editorial: Springer Verlag

 Fecha de publicación: 01/01/2015

Nº de páginas: 35

Tipo de publicación: Artículo de Revista

 DOI: 10.1007/JHEP01(2015)053

ISSN: 1126-6708,1029-8479

Proyecto español: FPA2014-55295-C3-1-R ; FPA 2011-28694-C02-01

Url de la publicación: https://doi.org/10.1007/JHEP01(2015)053