Chinese Physics C > 1996, Vol. 20 > Issue(6): 481-490

Study of ψ(2S)Decays into pπ and KK

BES Collaboration

Institute of High Energy Physics,The Chinese Academy of Sciences,Beijing 100039

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Abstract：
From a study of(2 S)decays into vector-pseudoscalar final states,ρπ and K K*,based on a sample of 1.27×10 ⁶produced (2 S) events,we have set upper limits at 90% confidence level on the branching fractions into ρπof 3.6×10 ^－5, into K ⁺ K^*+c.c.of 2.5×10 ^－5,and into K ⁰ K ^*0+c.c.of 1.2×10 ^－4.We find that all these decays are substantially suppressed relative to the corresponding J/ψ decays in comparison with PQCD predictions.Our results confirm the MARK Ⅱ measurements at an improved sensitivity level.

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BES Collaboration. Study of ψ(2 S)Decays into pπ and KK[J]. Chinese Physics C, 1996, 20(6): 481-490.

BES Collaboration. Study of ψ(2 S)Decays into pπ and KK[J]. Chinese Physics C, 1996, 20(6): 481-490. shu

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Received: 1900-01-01
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Study of ψ(2S)Decays into pπ and KK

BES Collaboration

Institute of High Energy Physics,The Chinese Academy of Sciences,Beijing 100039

Received Date:1900-01-01
Accepted Date:1900-01-01
Available Online:1996-06-05

Abstract:From a study of(2S)decays into vector-pseudoscalar final states,ρπ and KK*,based on a sample of 1.27×10⁶produced (2S) events,we have set upper limits at 90% confidence level on the branching fractions into ρπof 3.6×10^－5, into K⁺K^*+c.c.of 2.5×10^－5,and into K⁰K^*0+c.c.of 1.2×10^－4.We find that all these decays are substantially suppressed relative to the corresponding J/ψ decays in comparison with PQCD predictions.Our results confirm the MARK Ⅱ measurements at an improved sensitivity level.