标题： 非共振辐射四费米子过程图 显示英文标题

标题： Non-resonant diagrams in radiative four-fermion processes

摘要： 对于$e^+e^- \to e^- \bar\nu_e u \bar{d} \gamma$的完整树级截面进行了计算，并与$e^+e^- \to e^- \bar\nu_e u \bar{d} $和$e^+e^- \to \bar{u} d u \bar{d}$的截面进行了比较。 基于 GRACE 包的非辐射和辐射情况的事件生成器被提出。 特别关注了之前其他研究中被忽略的非共振图的影响。 它们对总截面的贡献在 LEP II 能量范围以及未来直线对撞机（$\sqrt s$=500 GeV）中被展示。 在 W 粒子阈值处，报告了 3%（$e^- \bar\nu_e u \bar{d}$）和 27%（$\bar{u} d u \bar{d}$）的影响。 辐射情况下的类似行为也被展示。 在$\sqrt s$= 500 GeV 时，辐射通道中非共振图的相对贡献达到 42.5%。 显示英文摘要

摘要： The complete tree level cross section for $e^+e^- \to e^- \bar\nu_e u \bar{d} \gamma$ is computed and discussed in comparison with the cross sections for $e^+e^- \to e^- \bar\nu_e u \bar{d} $ and $e^+e^- \to \bar{u} d u \bar{d}$. Event generators based on the GRACE package for the non-radiative and radiative case are presented. Special interest is brought to the effect of the non-resonant diagrams overlooked so far in other studies. Their contribution to the total cross section is presented for the LEP II energy range and for future linear colliders ($\sqrt s$ =500 GeV). Effects, at the W pair threshold, of order 3\% ($e^- \bar\nu_e u \bar{d}$) and 27\% ($\bar{u} d u \bar{d}$) are reported. Similar behaviour for the radiative case is shown. At $\sqrt s$ = 500 GeV, the relative contribution of the non-resonant diagrams for the radiative channel reaches 42.5\%.