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Measurement of the W boson helicity fractions in the decays of top quark pairs to lepton + jets final states produced in pp collisions at s=8TeV

Abstract: The W boson helicity fractions from top quark decays in tt? events are measured using data from proton?proton collisions at a centre-of-mass energy of 8TeV. The data were collected in 2012 with the CMS detector at the LHC, corresponding to an integrated luminosity of 19.8fb?1. Events are reconstructed with either one muon or one electron, along with four jets in the final state, with two of the jets being identified as originating from b quarks. The measured helicity fractions from both channels are combined, yielding F0=0.681±0.012(stat)±0.023(syst), FL=0.323±0.008(stat)±0.014(syst), and FR=?0.004±0.005(stat)±0.014(syst) for the longitudinal, left-, and right-handed components of the helicity, respectively. These measurements of the W boson helicity fractions are the most accurate to date and they agree with the predictions from the standard model.

 Fuente: Physics Letters B, Vol.762, Pp. 512?534 (2016)

 Editorial: Elsevier

 Fecha de publicación: 01/11/2016

 Nº de páginas: 23

 Tipo de publicación: Artículo de Revista

 DOI: 10.1016/j.physletb.2016.10.007

 ISSN: 0370-2693,1873-2445

 Url de la publicación: https://doi.org/10.1016/j.physletb.2016.10.007