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利用Bhabha散射过程测定了北京谱仪 (BESⅡ )在 2 0 0 2年和 2 0 0 3年收集的质心系能量s =3.6 5 0 ,3.6 86GeV数据样本的积分亮度为 (6 .4 2± 0 .2 4 )pb- 1和 (19.72± 0 .86 )pb- 1.这些结果为此两能量值处的各种过程的反应截面测量提供了必需的基本参数 .
The centroid energy of Beijing spectrometer (BESⅡ) collected in 2002 and 2003 was s = 3.650 using the Bhabha scattering process. The integral brightness of the 3.6-GHz data was 3.6 ± 0.60 .2 4) pb-1 and (19.72 ± 0.86) pb- 1. These results provide the basic parameters necessary for the reaction cross-section measurements of the various processes at these two energy values.