Positivity Bounds in Standard Model Effective Field Theory

by Prof. Cen Zhang (Institute of High Energy Physics, Chinese Academy of Sciences)

Tuesday 24 Nov 2020, 10:00 → 11:00 Asia/Shanghai

Online

Abstract:

Dimension-8 Wilson coefficients in the Standard Model Effective Field Theory (SMEFT) are subject to the so-called “positivity bounds”. They are derived from the axiomatic principles of quantum field theory. In the parameter space spanned by Wilson coefficients, these bounds carve out various kinds of convex bodies and cones. As a result, several concepts and tools from convex geometry are useful for understanding these positive structures. I will discuss some recent studies on this topic, with a focus on the connection between the convex structure of the parameter space and the UV physics behind the SMEFT. 


Biography：

2017-          Associate Professor，Institute of High Energy Physics, Chinese Academy of Sciences

2014-2017 Postdoctoral Research Associate, Brookhaven National Laboratory.

2012-2014 Postdoctoral Research Associate, Universite Catholique de Louvain.

2006-2011 Ph. D. Physics, University of Illinois at Urbana-Champaign

Zoom link:  https://zoom.com.cn/j/95343932382

Password: 383847

SJTU2020.pdf