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Paper   IPM / Particles / 15669
School of Particles and Accelerator
  Title:   Interference effects for the top quark decays tb+W+/H+(→τ+ντ)
  Author(s): 
1.  Seyed Mohammad Moosavi Nejad
2.  S Abbaspour
3.  R Farashahian
  Status:   Published
  Journal: Phys. Rev. D
  No.:  095012
  Vol.:  99
  Year:  2019
  Supported by:  IPM
  Abstract:
Applying the narrow-width approximation (NWA), we first review the NLO QCD predictions for the total decay rate of top quark considering two unstable intermediate particles: the W+-boson in the standard model (SM) of particle physics and the charged Higgs boson H+ in the generic type-I and II two-Higgs-doublet models, i.e. tb+W+/H+(→ τ+ντ). We then estimate the errors arised from this approximation at leading-order perturbation theory. Finally, we shall 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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