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

High Energy Physics - Experiment 2008-11-26 v2
Authors: BES Collaboration , M. Ablikim
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Abstract

Using 14 million ψ(2S)\psi(2S) events collected with the BESII detector, branching fractions of \psip\rar\kstarkpm\psip\rar\kstarkpm and \kstarknn\kstarknn are determined to be: \calB(\psip\rar\kstarkpm)=(2.9−1.7+1.3±0.4)×10−5\calB(\psip\rar\kstarkpm)=(2.9^{+1.3}_{-1.7}\pm0.4)\times 10^{-5} and \calB(\psip\rar\kstarknn)=(13.3−2.7+2.4±1.9)×10−5\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.

Keywords

psi(2S) decays branching fractions K* mesons 12% rule isospin violation BESII detector

Cite

@article{arxiv.hep-ex/0407037,
  title  = {Observation of the decay $\psip\rar\kstark$},
  author = {BES Collaboration and M. Ablikim},
  journal= {arXiv preprint arXiv:hep-ex/0407037},
  year   = {2008}
}

Comments

5 pages, 3 figures

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