A measurement of ψ (2S) resonance parameters

作者：Bai, JZ^*; Ban, Y; Bian, JG; Blum, I; Cai, X; Chang, JF; Chen, HF; Chen, HS; Chen, J; Chen, J; Chen, JC; Chen, YB; Chi, SP; Chu, YP; Cui, XZ; Dai, YS; Dong, LY; Du, ZZ; Dunwoodie, W; Fang, J; Fang, SS; Fu, HY; Fu, LP; Gao, CS; Gao, YN; Gong, MY; Gratton, P; Gu, SD; Guo, YN; Guo, YQ; Guo, ZJ; Han, SW; Harris, FA; He, J; He, KL; He, M; He, X; Heng, YK; Hong, T; Hu, HM; Hu, T; Huang, GS; Huang, XP; Izen, JM; Ji, XB; Jiang, CH; Jiang, XS; Jin, DP; Jin, S; Jin, Y; Jones, BD; Ke, ZJ

来源：Physics Letters B, 2002, 550(1-2): 24-32.

DOI：10.1016/S0370-2693(02)02909-X

• RADIATIVE-CORRECTIONS
• BHABHA SCATTERING
• E+E ANNIHILATION
• CROSS-SECTION
• DECAY
• DISTRIBUTIONS
• J/PSI
• PSI(2S)->PI(+)PI(-)J/PSI
• ENERGY

Cross sections for e(+)e(-) --> hadrons, pi(+)pi(-)J/psi, and mu(+)mu(-) have been measured in the vicinity of the psi(2S) resonance using the BESII detector operated at the BEPC. The psi(2S) total width; partial widths to hadrons, pi(+)pi(-)J/psi, leptons; and corresponding branching fractions have been determined to be Gamma(t) = 264 +/- 27 keV; Gamma(h) = 258 +/- 26 keV, Gamma(pi+pi-J/psi) = 85.4 +/- 18.7 keV, and Gamma(l) = 2.44 +/- 0.21 keV; and B-h = (97.79 +/- 0.15)%, Bpi+pi-J/psi (32.3 +/- 1.4)%, and B-l = (0.93 +/- 0.08)%, respectively.

• 出版日期2002-12-12
• 单位武汉大学; 中国高等科学技术中心; 浙江大学; 清华大学; 河南师范大学; 四川大学; 华中师范大学; 辽宁大学; 湖南大学; 上海交通大学; 中国科学技术大学; 山东大学; 南开大学; 北京大学