BES-Ⅲ和ILC上e^+e^-湮灭产生τ^+τ^-对  

The Production of τ^+τ^- Pair through e^+e^- Collider at BES-Ⅲ and ILC

作　　者：陈学文[1] 张家伟[1] 陈震亚[1] 

机构地区：[1]重庆科技学院数理学院,重庆401331

出　　处：《西南大学学报（自然科学版）》2017年第5期150-155,共6页Journal of Southwest University(Natural Science Edition)

基　　金：国家自然科学基金(11347024);重庆市科委基金(2014jcyjA00030);重庆市科委基金(2016jcyjA0336);重庆市教委基金(KJ1401313);重庆科技学院博士教授启动基金(CK2014B21);重庆科技学院重点项目培育基金(CK2015128)

摘　　要：结合北京谱仪3代(BES-Ⅲ)和规划中的国际直线对撞机(ILC)实验平台,采用一种新的计算模式讨论了它们相应对撞能区上e^+e^-→τ^+τ^-反应截面.在具体计算中,首先将QED中Dyson光子链图传播子理论推广到电弱统一标准模型中的光子、中间玻色子混合链图传播子;进而采用"混合链图传播子修正"这种新的计算模式,精确计算γ,Z_0混合链图传播子修正下e^+e^-→τ^+τ^-反应总截面σ^(chain),并与单圈修正下的总截面σ^(loop)和Born阶总截面σ~0做了对比分析,同时也将该研究获得的理论计算结果与LEP实验数据做了详细比较.数值结果显示,该理论结果在实验误差范围内与LEP实验观测值相符;在BES-Ⅲ的对撞能区内,σ^(chain)对σ^(loop)和σ~0的修正很小;在ILC的对撞能区上,σ^(chain)对σ^(loop)和σ~0的修正较大.In a study reported in this paper, we promoted the Dyson chain propagator theory of QED to the electroweak unification standard model, and acquired the mixing chain propagators of photon and intermediate gauge boson in the electroweak unification standard model. Based on it, we calculated the total reaction cross section of e＋ e→τ＋τ- under the γ, Z0 mixing chain propagators＇ correction, and compared with the total cross sections under the one loop correction and tree level, and we also compared our theoretical results with the experimental observations of LEP. In addition, we combined to Beijing spectrometer-Ⅲ and International Linear Collider, discussed the cross section of e＋ e→τ＋τ- at the collision energy regions of Beijing spectrometer-Ill and International Linear Collider. The numerical results showed that the correc- tion of σchain to σloop and σ0 was very small at Beijing spectrometer-Ⅲ, whereas at International Linear Collider the correction was large, and corrections of chain σchain to σloop could not be omitted.

关 键 词：标准模型 混合链图传播子 反应截面 辐射修正 

分 类 号：O572.24[理学—粒子物理与原子核物理]