Determination of the Total Width of P-wave Charmonium State χ<SUB>c0</SUB>

BES Collaboration

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2024年10月30日

Chinese Physics C> 1996, Vol. 20> Issue(12) : 1057-1067

Determination of the Total Width of P-wave Charmonium State χ_c0

BES Collaboration

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

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Abstract：
The total width of the χ_c0 was determined by analysing γπ⁺π^－ and γK⁺K^－ final states of ψ(2S) decays based on 3.5 million ψ(2S) events produced from the BES detector at BEPC.The Monte Carlo simulated mass resolution,being normalized by that determined experimentally at the χ_c2,is used in fitting the observed signal of the χ_c0 and thus results in a best estimate of the total width of χ_c0,Γ_χc0=(15.0+3.2－2.8)MeV.Improved values for the branching fractions of χ_cJ going to π⁺π^－ and K⁺K^－ are found to be B(χ_c0→π⁺π^－)=(4.27±0.23±0.60)×10^－3,B(χ_c0→K⁺K^－)=(3.44±0.21±0.47)×10^－3,B(χ_c2→π⁺π^－)=(1.52±0.17±0.29)×10^－3 and B(χ_c2→K⁺K^－)=(5.2±1.1±1.8)×10^－4, respectively.

References

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Particle Data Group,iPhys/i RAev.D50partI（1994）[2] J.E.Gaiseretal,iPhys/i.iRev/i.,D34（1986）711.[3] TA.Armstrongetal,iPhys/i.Aev.iLett/i,68（1992）1468.[4] GT.Bodwin,E.Braaten,G.P.Lepag,iPhys/i.iRev/i.,D46（1992）1914.[5] VL.Chernyak,R.A.Zhitnitsky,iPhys/i.Rep.,112（1984）123.[6] X.N.Wang,X.D.Xiang,T.Huang,Vomm.Theor.iPhys/i.,5（1986）123[7] BES Collab.,iNucl/i.Inst.Meth.,A344（1994）319[8] BES 合作组，高能物理与核物理，20（1996）97.[9] G.Karl,S.Meshkov,J.L.Rosner,iPhys/i.iRev/i.,D13（1976）1203;W.Tanenhaumetal.,iPhys/i.iRev/i.,D15（1978）731;M.Oregliaetal,iPhys/i.iRev/i.,D25（1982）2259.

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BES Collaboration. Determination of the Total Width of P-wave Charmonium State χ_c0[J]. Chinese Physics C, 1996, 20(12): 1057-1067.

BES Collaboration. Determination of the Total Width of P-wave Charmonium State χ_c0[J]. Chinese Physics C, 1996, 20(12): 1057-1067. 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

Determination of the Total Width of P-wave Charmonium State χ_c0

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: 1996-12-05

Abstract: The total width of the χ_c0 was determined by analysing γπ⁺π^－ and γK⁺K^－ final states of ψ(2S) decays based on 3.5 million ψ(2S) events produced from the BES detector at BEPC.The Monte Carlo simulated mass resolution,being normalized by that determined experimentally at the χ_c2,is used in fitting the observed signal of the χ_c0 and thus results in a best estimate of the total width of χ_c0,Γ_χc0=(15.0+3.2－2.8)MeV.Improved values for the branching fractions of χ_cJ going to π⁺π^－ and K⁺K^－ are found to be B(χ_c0→π⁺π^－)=(4.27±0.23±0.60)×10^－3,B(χ_c0→K⁺K^－)=(3.44±0.21±0.47)×10^－3,B(χ_c2→π⁺π^－)=(1.52±0.17±0.29)×10^－3 and B(χ_c2→K⁺K^－)=(5.2±1.1±1.8)×10^－4, respectively.