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Scientific article
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English

Measurement of the W boson polarization in top quark decays with the ATLAS detector

ContributorsATLAS Collaboration
Published inThe journal of high energy physics, vol. 088, 45
Publication date2012
Abstract

This paper presents measurements of the polarization of W bosons in top quark decays, derived from tt¯ events with missing transverse momentum, one charged lepton and at least four jets, or two charged leptons and at least two jets. Data from pp collisions at a centre-of-mass energy of 7 TeV were collected with the ATLAS experiment at the LHC and correspond to an integrated luminosity of 1.04 fb−1. The measured fractions of longitudinally, left- and right-handed polarization are F 0 = 0.67 ± 0.07, F L = 0.32 ± 0.04 and F R = 0.01 ± 0.05, in agreement with the Standard Model predictions. As the polarization of the W bosons in top quark decays is sensitive to the Wtb vertex Lorentz structure and couplings, the measurements were used to set limits on anomalous contributions to the Wtb couplings.

Keywords
  • Hadron-Hadron Scattering
Citation (ISO format)
ATLAS Collaboration. Measurement of the <em>W</em> boson polarization in top quark decays with the ATLAS detector. In: The journal of high energy physics, 2012, vol. 088, p. 45. doi: 10.1007/JHEP06(2012)088
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Article (Published version)
accessLevelPublic
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ISSN of the journal1029-8479
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