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

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

The W-boson helicity fractions in top-quark decays are measured with tt̄ events in the lepton+jets final state, using proton-proton collisions at a centre-of-mass energy of 7TeV, collected in 2011 with the CMS detector at the LHC. The data sample corresponds to an integrated luminosity of 5.0 fb [su...

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Bibliographic Details
Main Authors: CMS Collaboration, Apyan, Aram, Bauer, Gerry P, Busza, Wit, Cali, Ivan Amos, Di Matteo, Leonardo, Dutta, Valentina, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Gulhan, Doga Can, Klute, Markus, Lai, Yue Shi, Levin, Amy Elizabeth, Luckey Jr, P David, Ma, Teng, Nahn, Steven, Paus, Christoph M. E., Ralph, Duncan Kelley, Roland, Christof E, Roland, Gunther M, Stephans, George S. F., Stoeckli, Fabian, Sumorok, Konstanty C, Velicanu, Dragos Alexandru, Wolf, Roger, Wyslouch, Boleslaw, Yang, Ming, Yilmaz, Yetkin, Yoon, A. S., Zanetti, Marco, Wyslouch, Victoria, Chan, M., Kim, Y.
Other Authors: Massachusetts Institute of Technology. Department of Physics
Format: Article
Published: Springer Berlin Heidelberg 2018
Online Access:http://hdl.handle.net/1721.1/116055
https://orcid.org/0000-0002-9418-6656
https://orcid.org/0000-0002-3831-9071
https://orcid.org/0000-0001-9236-6621
https://orcid.org/0000-0002-0869-5631
https://orcid.org/0000-0003-1486-606X
https://orcid.org/0000-0002-6047-4211
https://orcid.org/0000-0001-8983-2169
https://orcid.org/0000-0003-3106-4894
https://orcid.org/0000-0002-1260-777X
https://orcid.org/0000-0003-3681-0649
https://orcid.org/0000-0002-2850-9007
Description
Summary:The W-boson helicity fractions in top-quark decays are measured with tt̄ events in the lepton+jets final state, using proton-proton collisions at a centre-of-mass energy of 7TeV, collected in 2011 with the CMS detector at the LHC. The data sample corresponds to an integrated luminosity of 5.0 fb [superscript -1]. The measured fractions of longitudinal, left-, and right-handed helicity are F0 = 0:682±0:030 (stat.)± 0:033 (syst.), F= 0:310 ±0:022 (stat.)± 0:022 (syst.), and F= 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 gL; gR are also derived. Keywords: Hadron-Hadron Scattering; Top physics

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