Search for Invisible Decay of the $��(1S)$

Authors :: The Belle Collaboration
Tajima, O.
Hayashii, H.
Hazumi, M.
Inami, K.
Iwasaki, Y.
Uehara, S.
Publication Year :: 2006
Publisher :: arXiv, 2006.
Abstract: 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}.<br />6 pages, 4 figures