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The W-boson helicity fractions in top-quark decays are measured with ttbarevents in the lepton+jets final state, using proton-proton collisions at acentre-of-mass energy of 7 TeV, collected in 2011 with the CMS detector at theLHC. The data sample corresponds to an integrated luminosity of 5.0 inversefemtobarns. The measured fractions of longitudinal, left-, and right-handedhelicity are F0 = 0.682 +/- 0.030 (stat.) +/- 0.033 (syst.), FL = 0.310 +/-0.022 (stat.) +/- 0.022 (syst.), and FR = 0.008 +/- 0.012 (stat.) +/- 0.014(syst.), consistent with the standard model predictions. The measured fractionsare used to probe the existence of anomalous Wtb couplings. Exclusion limits onthe real components of the anomalous couplings gL, gR are also derived.

Measurement of the W-boson helicity in top-quark decays from ttbar production in lepton+jets events in pp collisions at sqrt(s) = 7 TeV