ar X iv : h ep - e x / 04 07 03 7 v 2 2 9 M ar 2 00 5 Observation of the decay ψ ( 2 S ) → K ∗ ( 892 ) K
نویسندگان
چکیده
Using 14 million ψ(2S) events collected with the BESII detector, branching fractions of ψ(2S) → K(892)K+c.c. and K(892)K 0 + c.c. are determined to be: B(ψ(2S) → K(892)K + c.c.) = (2.9 −1.7 ± 0.4) × 10 −5 and B(ψ(2S) → K(892)K 0 + c.c.) = (13.3 −2.7 ± 1.7)× 10 . The results confirm the violation of the “12% rule” for these two decay channels. A large isospin violation between the charged and neutral modes is observed.
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