Measurement of the W-boson helicity in top-quark decays from tt¯ production in lepton+jets events in pp collisions at s√=7 TeV

CMS Collaboration; Chatrchyan, S; Khachatryan, V; Sirunyan, A M; et al; Chiochia, V; Kilminster, B; Robmann, P

doi:10.1007/JHEP10(2013)167

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CMS Collaboration, Chatrchyan, S., Khachatryan, V., Sirunyan, A. M., et al, Chiochia, V., Kilminster, B., & Robmann, P. (2013). Measurement of the W-boson helicity in top-quark decays from tt¯ production in lepton+jets events in pp collisions at s√=7 TeV. Journal of High Energy Physics, 10, 167. https://doi.org/10.1007/JHEP10(2013)167

Abstract

The W-boson helicity fractions in top-quark decays are measured with tt¯ 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 sta