时间：2017年12月26日（周二）下午4:00
地点：三教208
报告人：谌俊谋博士（美国匹兹堡大学）
报告题目：EW Splitting Functions and High EnergyShowering
报告内容：We derive the electroweak (EW) collinearsplitting functions up to single logs. We first derive the splitting functionsin the unbroken limit, and then we systematically incorporate effects ofEW symmetry breaking (EWSB), by imposing a particularly convenient gauge choice(dubbed “Goldstone Equivalence Gauge”) that disentangles the effects ofGoldstone bosons and gauge fields in the presence of EWSB. As a result, we areable to derive splitting functions up to leading power corrections in v/E. Wealso implement a comprehensive, practical EW showering scheme based on thesesplitting functions using a Sudakov evolution formalism. The implementation ofEW showering includes novel features such as “ultra-collinear” splittings,matching between shower and decay, and mixed-state evolution of neutral bosons(γ/Z/h) using density-matrices, kinematic back-reaction corrections inmulti-stage showers. We demonstrate those new phenomena and features at O(1–10TeV) energies with some examples.
报告人简介：谌俊谋 2017-05 美国匹兹堡大学，获博士学位
2012-07 南开大学，获硕士学位
2008-09 吉林大学，获学士学位
研究方向集中于：研究标准模型在对撞机下的行为，以及相关场论课题
邀请人：李学潜，赵明刚
