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Search for Invisible Decays of the Upsilon(1S) Resonance

P. Rubin·CLEO Collaboration
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Abstract

We present a measurement of the branching fraction of invisible Upsilon(1S) decays, using 1.2 fb^{-1} of data collected at the Upsilon(2S) resonance with the CLEO III detector at CESR. After subtracting expected backgrounds from events that pass selection criteria for invisible Upsilon(1S) decay in Upsilon(2S) -> pi+ pi- Upsilon(1S), we deduce a 90% C.L. upper limit of B[Upsilon(1S) -> invisible] < 0.39%.

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P. Rubin, CLEO Collaboration. 2007-02-07. Search for Invisible Decays of the Upsilon(1S) Resonance. https://doi.org/10.1103/physrevd.75.031104

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