Search for Invisible Decay of the $\Upsilon(1S)$

et al; H. Hayashii; K. Inami; M. Hazumi; S. Uehara; The Belle Collaboration: O. Tajima; Y. Iwasaki

arxiv: hep-ex/0611041 · v3 · submitted 2006-11-24 · ✦ hep-ex

Search for Invisible Decay of the Upsilon(1S)

The Belle Collaboration: O. Tajima , H. Hayashii , M. Hazumi , K. Inami , Y. Iwasaki , S. Uehara , et al This is my paper

classification ✦ hep-ex

keywords upsiloninvisibledatadecaysearchasymmetric-energybellebranching

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We report results of a search for the invisible decay of the Upsilon(1S) via the Upsilon(3S)->pi+pi-Upsilon(1S) transition using a data sample of 2.9 fb^{-1} at the Upsilon(3S) resonance. The data were collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. No signal is found, and an upper limit for the branching fraction at the 90% confidence level is determined to be B(Upsilon(1S)->invisible) < 2.5x10^{-3}.

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Search for Invisible Decay of the Upsilon(1S)

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