Measurement of J/ψ leptonic width with the KEDR detector

摘要：

We report a new precise determination of the leptonic widths of the J/psi meson performed with the KEDR detector at the VEPP-4M e+e-collider.The measured values of the J/psi parameters are: Гee×Гee/Г=0.3323±0.0064(stat.)±0.0048(syst.)keV, Гee×Гμμ/Г=0.3318±0.0052(stat.)Г0.0063(syst.)keV. Assuming eμ universality and using the table value of the branching ratios the leptonic Г11=5.59±0.12 keV width and the total Г=94.1±2.7 keV widths were obtained. We also discuss in detail a method to calculate radiative corrections at a narrow resonance.

关键词： J/ψ meson lepton width full width

作者: A.G.Shamov

作者单位: Budker Institute of Nuclear Physics,11,Lavrentiev prospect,Novosibirsk,630090,Russia

会议类型: 国际会议

会议名称: 国际φ电子到ψ电子正负电子碰撞研讨会

会议地点: 北京

会议语种:英文

页码: 836-841

在线出版日期: 2009-10-13（万方平台首次上网日期，不代表论文的发表时间）