ψ′强衰变分支比测定中探测效率的修正

Efficiency Correction in the Branching Fraction Determination of ψ′ Hadronic Decays

利用北京谱仪收集的 4× 10 6ψ′事例样本 ,在 ψ′衰变到ωπ+π-,b1π ,ωf2 ( 12 70 ) ,ωK+K-,ωp p ,φπ+π-,φf0 ( 980 ) ,φΚ+K-,φp p末态的研究中 ,讨论了粒子鉴别条件和运动学拟合的选择效率及其修正 ,据此得到了这 9个末态的分支比的初步结果 ,检验了微扰QCD预期的 12 %规则 .

The detection efficiency corrections for the particle identification and kinematic fit selection criteria are investigated for the branching fraction measurements in ψ′ decays into ωπ+π-, b 1π,ωf 2(1270), ωK+K-, ωp, φπ+π-, φf 0(980), φK+K-, φp final states using 4×106 ψ′ data sample collected at BEPC/BES. Based on the corrected efficiencies, the preliminary results of these decay channels have been obtained, and the '12%' rule predicted by perturbative QCD theory has been tested.