标题： 胶子辐射与顶夸克产生中的能量损失 显示英文标题

标题： Gluon Radiation and Energy Losses in Top Quark Production

摘要： 在$\tt$产生过程中，$\ee$粒子湮灭时发出高能胶子可能具有重要的实验后果，特别是对顶夸克质量测量的影响。 我们给出了胶子能量分布及其平均值在QCD微扰理论一阶下的简洁解析表达式。 我们的结果适用于任意质量、碰撞能量和产生电流。 我们特别关注阈值附近的顶夸克产生，并表明在某些情况下，软胶子近似不足以描述辐射谱。 显示英文摘要

摘要： The emission of energetic gluons in $\tt$ production in $\ee$ annihilation can have important experimental consequences, in particular on top quark mass measurements. We present compact, analytical expressions for the gluon energy distribution and its average value at first order in QCD perturbation theory. Our results are valid for arbitrary masses, collision energies and production currents. We pay particular attention to top quark production near threshold, and show that in certain cases the soft gluon approximation is insufficient to describe the radiation spectrum.