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

S. Chatrchyan, V. Khachatryan, A. M. Sirunyan, A. Tumasyan, W. Adam, T. Bergauer, M. Dragicevic, J. Erö, C. Fabjan, M. Friedl, R. Frühwirth, V. M. Ghete, N. Hörmann, J. Hrubec, M. Jeitler, W. Kiesenhofer, V. Knünz, M. Krammer, I. Krätschmer, D. LikoI. Mikulec, D. Rabady, B. Rahbaran, C. Rohringer, H. Rohringer, R. Schöfbeck, J. Strauss, A. Taurok, W. Treberer-Treberspurg, W. Waltenberger, C. E. Wulz, V. Mossolov, N. Shumeiko, J. Suarez Gonzalez, S. Alderweireldt, M. Bansal, S. Bansal, T. Cornelis, E. A. De Wolf, X. Janssen, A. Knutsson, S. Luyckx, L. Mucibello, S. Ochesanu, B. Roland, R. Rougny, Z. Staykova, H. Van Haevermaet, P. Van Mechelen, M. Kadastik, The CMS collaboration

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Abstract

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 -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.

Original languageEnglish
Article number167
JournalJournal of High Energy Physics
Volume2013
Issue number10
DOIs
Publication statusPublished - Oct 1 2013

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Keywords

  • Hadron-Hadron Scattering
  • Top physics

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Chatrchyan, S., Khachatryan, V., Sirunyan, A. M., Tumasyan, A., Adam, W., Bergauer, T., ... The CMS collaboration (2013). Measurement of the W-boson helicity in top-quark decays from tt̄ production in lepton+jets events in pp collisions at√s = 7 TeV Th. Journal of High Energy Physics, 2013(10), [167]. https://doi.org/10.1007/JHEP10(2013)167