The Standard Model Effective Field Theory (SMEFT) has seen rapid development in both theoretical and phenomenological aspects in recent years. This report will provide a brief introduction to the construction of a complete and independent operator basis for SMEFT using the Young Tensor method and its physical applications: specifically, the impact of dimension-8 operators on diboson production processes at hadron colliders. Due to the suppression of some dimension-6 interference contributions in the high-energy limit, the interference terms from dimension-8 operators and the squared terms from dimension-6 operators become the leading contributions to diboson production processes at the same order. We systematically and quantitatively study the relative size of the dimension-8 interference terms compared to the dimension-6 squared terms and identify a novel cancellation effect in the dimension-8 interference terms.

Biography

Hao-Lin Li is a postdoc at Center for cosmology and particle physics phenomenology at UCLouvain. He works extensively on various aspects on effective field theory including basis construction, collider phenomenology and neutrino physics. Prior to that he is a postdoc at ITP-CAS.  and obtained his PhD in University of Massachusetts Amherst in 2018.

Inviter

Jiang-Hao Yu