Study of ψ(2<EM>S</EM>)Decays into pπ and KK

BES Collaboration

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(2S)decays into vector-pseudoscalar final states,ρπ and KK*,based on a sample of 1.27×10⁶ produced (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.

References

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T.Applequist,D.Politzer,Phys.Rev.Lett.,34（1975）43.[2]ParticleDataGroup,Phys,Rev.,D50（1994）3.[3]M.E.B、Franklin et al.,Phys.Rev.Lett.,51（1983）11.[4]S.JBrodsky,G.PLepage,S.F.Tuan,Phys.Rev.Lett.,59（1987）621.[5]M.Chaichian,N.A Tornqvist,Nucl.Phys.,B323（1989）75.[6]S.Pinsky,Phys.Lett.,B236（1990）479.[7]丁慧良等，高能物理与核物理，16（1992）769;J.Z Bai et al.,Nucl.Instr.Method,A344（1994）319.[8]BES合作组，高能物理与核物理，19（1995）577

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

BES Collaboration. Study of ψ(2S)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 1.27×10⁶ produced (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.