Measurement of the W-boson helicity in top-quark decays from ttover-bar production in lepton plus jets events in pp collisions at root s=7 TeVReport as inadecuate




Measurement of the W-boson helicity in top-quark decays from ttover-bar production in lepton plus jets events in pp collisions at root s=7 TeV - Download this document for free, or read online. Document in PDF available to download.

(2013)JOURNAL OF HIGH ENERGY PHYSICS. Mark abstract 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.

Please use this url to cite or link to this publication: http://hdl.handle.net/1854/LU-4953948



Author: S Chatrchyan, V Khachatryan, AM Sirunyan, A Tumasyan, W Adam, T Bergauer, M Dragicevic, J Eroe, C Fabjan, M Friedl, et al.

Source: https://biblio.ugent.be/publication/4953948



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