The invisible branching fractions of J/psi, psi(2S), and Upsilon(nS) to neutrino pairs are predicted at the 10^-8 to 10^-5 level, offering a way to measure the weak mixing angle at quarkonia mass scales.
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Invisible decays of vector Charmonia and Bottomonia to determine the Weak Mixing Angle at quarkonia scale
The invisible branching fractions of J/psi, psi(2S), and Upsilon(nS) to neutrino pairs are predicted at the 10^-8 to 10^-5 level, offering a way to measure the weak mixing angle at quarkonia mass scales.