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Measurement of the W boson polarization in top decay at CDF at √s = 1.8 TeV

Publication ,  Journal Article
Acosta, D; Affolder, T; Albrow, MG; Ambrose, D; Amidei, D; Anikeev, K; Antos, J; Apollinari, G; Arisawa, T; Artikov, A; Ashmanskas, W; Cauz, D ...
Published in: Physical Review D - Particles, Fields, Gravitation and Cosmology
2005

The polarization of the W boson in t →Wb decay is unambiguously predicted by the standard model of electroweak interactions and is a powerful test of our understanding of the tbW vertex. We measure this polarization from the invariant mass of the b quark from t → Wb and the lepton from W → lν whose momenta measure the W decay angle and direction of motion, respectively. In this paper we present a measurement of the decay rate (f V+A) of the W produced from the decay of the top quark in the hypothesis of V + A structure of the tWb vertex. We find no evidence for the nonstandard V + A vertex and set a limit on fV+A < 0.80 at 95% confidence level. By combining this result with a complementary observable in the same data, we assign a limit on fv+A < 0.61 at 95% CL. This corresponds to a constraint on the right-handed helicity component of the W polarization of f+ < 0.18 at 95% CL. This limit is the first significant direct constraint on fV+A in top decay. © 2005 The American Physical Society.

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Published In

Physical Review D - Particles, Fields, Gravitation and Cosmology

DOI

Publication Date

2005

Volume

71

Issue

3

Start / End Page

031101-1-031101-7

Related Subject Headings

  • Nuclear & Particles Physics
  • 5107 Particle and high energy physics
  • 5101 Astronomical sciences
  • 4902 Mathematical physics
  • 0206 Quantum Physics
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
  • 0201 Astronomical and Space Sciences
 

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Acosta, D., Affolder, T., Albrow, M. G., Ambrose, D., Amidei, D., Anikeev, K., … Zucchelli, S. (2005). Measurement of the W boson polarization in top decay at CDF at √s = 1.8 TeV. Physical Review D - Particles, Fields, Gravitation and Cosmology, 71(3), 031101-1-031101–031107. https://doi.org/10.1103/PhysRevD.71.031101
Acosta, D., T. Affolder, M. G. Albrow, D. Ambrose, D. Amidei, K. Anikeev, J. Antos, et al. “Measurement of the W boson polarization in top decay at CDF at √s = 1.8 TeV.” Physical Review D - Particles, Fields, Gravitation and Cosmology 71, no. 3 (2005): 031101-1-031101–7. https://doi.org/10.1103/PhysRevD.71.031101.
Acosta D, Affolder T, Albrow MG, Ambrose D, Amidei D, Anikeev K, et al. Measurement of the W boson polarization in top decay at CDF at √s = 1.8 TeV. Physical Review D - Particles, Fields, Gravitation and Cosmology. 2005;71(3):031101-1-031101–7.
Acosta, D., et al. “Measurement of the W boson polarization in top decay at CDF at √s = 1.8 TeV.” Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 71, no. 3, 2005, pp. 031101-1-031101–07. Scival, doi:10.1103/PhysRevD.71.031101.
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Published In

Physical Review D - Particles, Fields, Gravitation and Cosmology

DOI

Publication Date

2005

Volume

71

Issue

3

Start / End Page

031101-1-031101-7

Related Subject Headings

  • Nuclear & Particles Physics
  • 5107 Particle and high energy physics
  • 5101 Astronomical sciences
  • 4902 Mathematical physics
  • 0206 Quantum Physics
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
  • 0201 Astronomical and Space Sciences