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arXiv · hep-ex/0407037

Observation of the decay $\psip\rar\kstark$

BES Collaboration·M. Ablikim
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Abstract

Using 14 million $ψ(2S)$ events collected with the BESII detector, branching fractions of $\psip\rar\kstarkpm$ and $\kstarknn$ are determined to be: $\calB(\psip\rar\kstarkpm)=(2.9^{+1.3}_{-1.7}\pm0.4)\times 10^{-5}$ and $\calB(\psip\rar\kstarknn)=(13.3^{+2.4}_{-2.7}\pm1.9)\times 10^{-5}$. The results confirm the violation of the "12%" rule for these two decay channels with higher precision. A large isospin violation between the charged and neutral modes is observed.

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BES Collaboration, M. Ablikim. 2005-03-29. Observation of the decay $\psip\rar\kstark$. https://doi.org/10.1016/j.physletb.2005.03.071

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