I discuss three different selected topics in top quark physics. The first topic concerns the next-to-next-to-leading order calculation of the hadroproduction of top quark pairs and the role of multiple polylogarithms in this calculation. I report on an ongoing next-to-next-to-leading order calculation of heavy quark pair production in hadron collisions where the loop-by-loop part of the calculation is about to be completed Calculating the loop-by-loop part allows one to take a glimpse at the mathematical structure of the full NNLO calculation. The loop-by-loop contributions bring in a new class of functions introduced only eight years ago by the Russian mathematician Goncharov called multiple polylogarithms. The second topic concerns a next-to-leading order calculation of unpolarized top quark decays which are analyzed in cascade fashion t -> b+W+ followed by W+ -?^sZ+ + fj. Finally, I present some next-to-leading order results on polarized top quark decays which are analyzed in the top quark rest system.
展开▼
机译：我在顶级夸克物理中讨论了三个不同选定的主题。第一个主题涉及顶部曲线对的下一次术语计算，以及多个Polylogarithms在该计算中的作用。我报告了在强子碰撞中的重型Quark对生产的正在进行的下一阶段下订单计算，其中计算逐环部分的循环部分即将完成计算逐环部分允许一个在全NNLO计算的数学结构上瞥见。逐环贡献引入了一系列新的函数，只有八年前由俄罗斯数学家Goncharov称为多个Polylogarithms。第二个主题涉及在级联时尚T - > B + W +中分析的未经偏振顶夸克衰减的下一级顺序计算，然后是W + - ？^ SZ + + FJ。最后，我提出了一些在顶部夸克休息系统中分析的偏振顶夸克衰减的下一阶段结果。
展开▼
