title: Extracting the light quark mass ratio m(u)/m(d) from bottomonia transitions.
abstract: We propose a new method to extract the light quark mass ratio m(u)/m(d) using the Υ(4S)→h(b)π⁰(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)→h(b)η is expected to be a nice channel for searching for the h(b) state.
authors.affiliation: Institut für Kernphysik and Jülich Center for Hadron Physics, Forschungszentrum Jülich, D-52425 Jülich, Germany.
authors.forename: Feng-Kun
authors.initials: FK
authors.lastname: Guo
authors.forename: Christoph
authors.initials: C
authors.lastname: Hanhart
authors.forename: Ulf-G
authors.initials: UG
authors.lastname: Meissner