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

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

2009-08-20

arxiv.org/abs/0908.2840v2

Phys.Rev.Lett.103:251801,2009

Physics

High Energy Physics

High Energy Physics - Experiment

7 pages, 3 postscript figures, submitted to Physical Review Letters

Scientific paper

10.1103/PhysRevLett.103.251801

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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