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

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

2006-12-21

arxiv.org/abs/hep-ex/0612051v2

Phys.Rev.D75:031104,2007

Physics

High Energy Physics

High Energy Physics - Experiment

10 pages postscript,also available through http://www.lns.cornell.edu/public/CLNS/2006/, Submitted to PRD (Rapid Comm)

Scientific paper

10.1103/PhysRevD.75.031104

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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