e^+e^-反应中共振截面的辐射修正  

RADIATIVE CORRECTION OF THE RESONANT CROSS SECTION IN e^+e^- COLLISION

作　　者：陈凤至 王平[1] 吴济民[1] 朱永生[1] 

机构地区：[1]中国科学院高能物理研究所

出　　处：《高能物理与核物理》1990年第7期585-595,共11页High Energy Physics and Nuclear Physics

摘　　要：本文导出了e^+e^-对撞实验中产生的共振态的辐射修正截面的近似解析公式.对于Z^0粒子和J/φ家族的粒子,在确定这些共振态参数的实验扫描能量范围内,该解析近似的精度达到0.1％量级.利用解析近似公式与对撞束能量分辨函数的卷积拟合实验观测到的共振截面数据,可得到比当前普遍采用的Jackson,Scharre方法更准确的共振参数值.An approximate analytical expression for the radiatively corrected cross section of the resonances in e^+e^- collision has been derived with the accuracy to the order of 0.1% for the Z boson as well as the J/φ and γ family particles within the experimentally scanned energy range It is recommended using this analytical expression to treat the resonances which have to be folded with the accelerator beam energy spread in the experimental data analysis. This provides an alternative to the previous method of Jackson and Scharre. It possesses much higher accuracy.

关 键 词：e^+e^-反应 共振截面 辐射 修正 

分 类 号：O572.322[理学—粒子物理与原子核物理]