Improved determination of inclusive electromagnetic decay ratios of heavy quarkonium from QCD

Understand

We consider a different power counting in potential NRQCD by incorporating the static potential exactly in the leading order Hamiltonian.

• We compute the leading relativistic corrections to the inclusive electromagnetic decay ratios in this new scheme.
• The effect of this new power counting is found to be large (even for top).
• We produce an updated value for the $\eta_b$ decay to two photons.