If the top quark were stable, the low-lying states of toponium ttÌ… could be approximated by non-relativistic motion in a Coulomb potential (cf. Equation (7.2a))

with α_s ‰ˆ 0.1. Use the simple Bohr model to calculate the radius of the ground state and the time taken to complete a single Bohr orbit in the ground state. Compare this with the expected lifetime of the top quark.

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4 aς V (r) = 3г