Amplitude Reduction

by Zhao LI Zhao (IHEP-CAS)

Thursday 21 Mar 2019, 16:00 → 17:00 Asia/Shanghai

3304 (北京工业大学数理楼)

In this talk we will introduce an alternative approach based on series representation to directly reduce multi-loop multi-scale scattering amplitude into set of freely chosen master integrals. And this approach avoid complicated calculations of inverse matrix and dimension shift for tensor reduction calculation. During this procedure we further utilize the Feynman parametrization to calculate the coefficients of series representation and obtain the form factors. Conventional methodologies are used only for scalar vacuum bubble integrals to finalize the result in series representation form. Finally, we elaborate our approach by presenting the reduction of a typical two-loop amplitude for W boson production. 李钊，2004年毕业于北京大学物理系(学士)；2009年在北京大学物理学院理论所获博士学位；2009年至2012年在美国密歇根州立大学物理天文系从事博士后研究；2012年8月起任高能物理研究所副研究员。长期从事高能强子对撞机上新物理信号过程的高阶辐射修正效应，此外利用一些重要标准模型过程（如Drell-Yan过程，双光子产生过程等）的高精度理论预言进行标准模型的精确检验。