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Measurement of the W-boson helicity in top-quark decays from tt-bar production in lepton+jets events in pp collisions at s√=7 TeV
Baringer, Philip S. Bean, Alice Benelli, Gabriele Kenny, R. P., III Murray, Michael J. Noonan, Danny Sanders, Stephen J. Stringer, Robert W. Wood, Jeffrey Scott Chatrchyan, S.
Baringer, Philip S.
Bean, Alice
Benelli, Gabriele
Kenny, R. P., III
Murray, Michael J.
Noonan, Danny
Sanders, Stephen J.
Stringer, Robert W.
Wood, Jeffrey Scott
Chatrchyan, S.
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Abstract
The W-boson helicity fractions in top-quark decays are measured with tt-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.
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This is the publisher's version, also available electronically from http://link.springer.com/article/10.1007%2FJHEP10%282013%29167.
Date
2013-10-24
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Springer Berlin Heidelberg
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S. Chatrchyan et al. (2013). "Measurement of the W-boson helicity in top-quark decays from tt-bar production in lepton+jets events in pp collisions at s√=7 TeV." Journal of High Energy Physics, 10(2013):167. http://www.dx.doi.org/10.1007/JHEP10(2013)167.