中国物理学会高能物理分会第十一届全国会员代表大会暨学术年会

散射截面是研究粒子基本结构和相互作用的基本观测量。当散射过程涉及多个能标时，精确计算结果很难得到。当能标之比很大时，结果会展示出大对数结构。在领头幂次阶，该大对数已经了解的比较清楚了。但是在次领头幂次阶，会出现新的困难，例如端点发散。这时需要发展新的理论来处理这些困难。我将介绍这方面的最新进展。

We investigate the extent to which perturbative calculations of the electroweak phase transition are arbitrary and uncertain, owing to their gauge, renormalization scale and scheme dependence, as well as treatments of the Goldstone catastrophe and daisy diagrams. Using the complete parameter space of the Standard Model extended by a real scalar singlet with a Z2 symmetry as a test, we explore...