【摘要】 介绍了利用e+ e- 对撞中双 μ产生和双γ产生两种QED过程来测量积分亮度的新思路 .前者的特色在于用单根径迹选择双 μ事例 ,后者则是首次利用双γ事例测定亮度 .两种方法分别用于 1 998年春季北京谱仪 (BES)R值扫描 6个能量点的积分亮度测量 ,所得结果的误差分别小于 8.0 %和 7.5% ,在误差范围内与大角度巴巴事例积分亮度值一致更多还原

【Abstract】 Two new methods are introduced for the first time at BES to measure the integrated luminosity from events in large angle produced by QED dimuon and two gamma production processes. With these methods,the integrated luminosities of the 6 energy points at 2.6,3.2,3.4,3.55,4.6 and 5.0 GeV scanned for the measurement of R are determined. The measured integrated luminosities are consistent with that determined using large angle Bhabha events.更多还原