= Top-quark decay before hadronization
{title2=$\Gamma(t\to bW)=G_Fm_t^3|V_{tb}|^2(1-x)^2(1+2x)/(8\pi\sqrt2)$}
Here $x=m_W^2/m_t^2$, and the tree-level <decay width> neglects the <bottom quark> mass. The open two-body W channel gives a <top quark> lifetime of a few $10^{-25}\,\mathrm s$, shorter than the <hadronization time>. A fifth-power <Sargent's rule> extrapolation misses this physical regime.<Review of Particle Physics by Particle Data Group (2022)>[Top Quark review, section 61.2, equation 61.1 and the accompanying lifetime discussion]{ref}
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