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.
A Search for Invisible Decays of the Upsilon(1S)
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abstract
We search for invisible decays of the Upsilon(1S) meson using a sample of 91.4 x 10^{6} Upsilon(3S) mesons collected at the BaBar/PEP-II B-factory. We select events containing the decay Upsilon(3S) -> pi+ pi- Upsilon(1S) and search for evidence of an undetectable Upsilon(1S) decay recoiling against the dipion system. We set an upper limit on the branching fraction BR(Upsilon(1S) -> invisible) < 3.0 x 10^{-4} at the 90% confidence level.
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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.