Exploring Abelian–Non-Abelian Kinetic Mixing in SMEFT and Beyond

by 自强 阮 (中央研究院)

Wednesday 5 Nov 2025, 15:10 → 16:10 Asia/Shanghai

B105 (CHEP)

We explore a novel scenario involving Abelian–non-Abelian kinetic mixing within the framework of the Standard Model Effective Field Theory (SMEFT) and its extension with a real triplet scalar field (SMEFT+triplet). In SMEFT, this mixing arises exclusively from a dimension-6 operator involving the Standard Model Higgs doublet, while the real triplet scalar field introduces an additional dimension-5 operator. We derive the modifications to electroweak gauge boson properties and impose constraints using electroweak precision data. In SMEFT, we find that Z-pole data at LEP-I imposes a stringent constraint on the kinetic mixing parameter, requiring it to be less than one part of 10 thousands, which corresponds to a new physics scale of about 10 Tera electric volt. In the SMEFT+triplet scenario, the constraint can be significantly relaxed with a sizeable triplet vacuum expectation value while preserving custodial symmetry in a finely-tuned parameter space. Future measurements from the Circular Electron Positron Collider (CEPC) could probe the kinetic mixing parameter down to an order of magnitude smaller.

Bio:
阮自强（TC Yuan），现任中国台湾地区中央研究院物理所研究员。学士毕业于台湾大学，博士毕业于美国东北大学，曾于范德堡大学、西北大学、加州大学戴维斯分校及台湾新竹清华大学从事博士后研究。

Tencent Meeting：911-854-563