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Interference effects for the top quark decays t→b+W+/H+(→τ+ντ)

S. Mohammad Moosavi Nejad1,2,*, S. Abbaspour1, and R. Farashahian1

  • 1Faculty of Physics, Yazd University, P.O. Box 89195-741, Yazd, Iran
  • 2School of Particles and Accelerators, Institute for Research in Fundamental Sciences (IPM), P.O.Box 19395-5531, Tehran, Iran

  • *mmoosavi@yazd.ac.ir
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Phys. Rev. D 99, 095012 – Published 16 May, 2019

DOI: https://doi.org/10.1103/PhysRevD.99.095012

Abstract

Applying the narrow-width approximation, we first review the next-to-leading-order QCD predictions for the total decay rate of a top quark considering two unstable intermediate particles: the W+ boson in the standard model of particle physics and the charged Higgs boson H+ in the generic type-I and -II two-Higgs-doublet models, i.e., t→b+W+/H+(→τ+ντ). We then estimate the errors that arise from this approximation at leading-order perturbation theory. Finally, we investigate the interference effects in the factorization of production and decay parts of intermediate particles. We will show that for nearly mass-degenerate states (mH+≈mW+) the correction due to the interference effect is considerable.

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Phys. Rev. D 99, 095012– Published 16 May, 2019
  • Received 5 March 2019
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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