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Search for invisible decays of the Υ(1S) resonance

P. Rubin et al. (CLEO Collaboration)
Phys. Rev. D 75, 031104(R) – Published 9 February 2007

Abstract

We present a measurement of the branching fraction of invisible Υ(1S) decays, using 1.2fb1 of data collected at the Υ(2S) resonance with the CLEO III detector at CESR. After subtracting expected backgrounds from events that pass selection criteria for invisible Υ(1S) decay in Υ(2S)π+πΥ(1S), we deduce a 90% C.L. upper limit of B[Υ(1S)invisible]<0.39%.

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  • Received 21 December 2006

DOI:https://doi.org/10.1103/PhysRevD.75.031104

©2007 American Physical Society

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Vol. 75, Iss. 3 — 1 February 2007

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