Search for narrow states coupling to τ pairs in radiative ϒ decays
1985
Abstract We have investigated the ϒ→γττ using tagged ϒ mesons from the decay ϒ'→π + π − ϒ. The photon spectrum exhibits no monochromatic line corresponding to a narrow object decaying into a τ pair and is fully compatible with the expected background contributions. The branching ratio Br(ϒ→τ + τ − is determined to be (3.07±0.46±0.22)%.
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