“School of Particles And Accelerator”
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| Paper IPM / Particles And Accelerator / 15669 |
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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. t→ b+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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