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
TL;DR
This paper reports a search for invisible decay modes of the Upsilon(1S) meson using data from the Belle detector, setting an upper limit on the decay's branching fraction.
Contribution
First search for invisible decay of Upsilon(1S) using the Upsilon(3S) transition with Belle data, establishing an upper limit on the branching fraction.
Findings
No signal observed for invisible decay.
Upper limit on branching fraction: 2.5 x 10^{-3}.
Data collected at the Upsilon(3S) resonance.
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}.
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