Extracting the Light Quark Mass Ratio mu/md from Bottomonia Transitions

We propose a new method to extract the light quark mass ratio mu/md using the Υ(4S)→hbπ0(η) bottomonia transitions. The decay amplitudes are dominated by the light quark mass differences, and the corrections from other effects are rather small, allowing for a precise extraction. We also discuss how to reduce the theoretical uncertainty with the help of future experiments. As a by-product, we show that the decay Υ(4S)→hbη is expected to be a nice channel for searching for the hb state.