Seminar detail: SMEFT, HEFT, and Beyond: Introducing the Broken-Phase EFT

Date&Time	Tue Feb 24 2026 (13:00 - 14:00)
Speaker	Yoshiki Uchida
Affiliation	華中師範大学
Title	SMEFT, HEFT, and Beyond: Introducing the Broken-Phase EFT
Abstract	There are two representative effective field theories (EFTs) formulated in terms of Standard Model particles: the Standard Model EFT (SMEFT) and the Higgs EFT (HEFT). The SMEFT Lagrangian is invariant under $SU(3)_C \times SU(2)_L \times U(1)_Y$, while the HEFT is invariant under $SU(3)_C$ with a non-linearly realized $SU(2)_L \times U(1)_Y$. In recent years, there has been active research on how ultraviolet (UV) theories match onto the SMEFT and the HEFT, and how their predictions differ. In this talk, I will give a brief overview of the SMEFT and the HEFT and introduce a new framework: the broken-phase EFT (bEFT). I will show how the type-II seesaw model can be matched onto the bEFT, and compare our approach with previous studies that match the type-II seesaw model onto the SMEFT. Finally, I will demonstrate how accurately the bEFT reproduces the full UV theory. This talk is based on Phys. Rev. D 112, 035005. If the time is allowed, I will also talk about the recent study on lepton flavor violating dark matter interactions via indirect detection in EFTs.
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