9th General Meeting of the LHC EFT Working Group

Session

Fits & two-loop LEFT

2 Dec 2025, 11:10

4/3-006 - TH Conference Room (CERN)

Conveners

Fits & two-loop LEFT

• Jonathon Mark Langford (Imperial College (GB))

10. (Remote) Updates from the SMEFiT collaboration

Jaco ter Hoeve (University of Edinburgh)

02/12/2025, 11:10

We present projections for the New Physics reach of future high-energy colliders in the SMEFiT framework. Our analysis focuses on near-term electron–positron colliders (FCC-ee, LEP3, CEPC, LCF), complemented in some cases by projections for the FCC-hh, LHeC, and MuCol. Results are presented in terms of coupling modifiers (kappa-formalism), effective couplings, and global SMEFT fits, the latter...

20. A fast and differentiable SMEFT likelihood

Aleks Smolkovic (Jozef Stefan Institute)

02/12/2025, 11:35

The Standard Model Effective Field Theory (SMEFT) has proven to be a valuable framework for studying a broad class of models beyond the SM containing heavy degrees of freedom. The phenomenology of SMEFT can be developed systematically, incorporating essential effects such as Renormalization Group (RG) evolution and matching onto subsequent low-energy Weak Effective Field Theories (WET),...

4. Two-loop ADMs in the LEFT and related issues

Marko Pesut (University of Zürich)

02/12/2025, 12:00

We derive the complete set of two-loop anomalous dimensions describing the mixing of four-fermion operators in the Low Energy Effective Field Theory (LEFT). The calculation is performed in Naive Dimensional Regularization with anticommuting $\gamma_5$ (the NDR scheme), and the results are given in the "JMS basis" of dimension-six operators. The derivation relies on known results for UV poles...