Year: 2026
Type: preprint
Abstract: We present a tool for the automated generation of Universal Feynman Output (UFO) files, used as input by many event generators, for generic Beyond the Standard Model (BSM) theories and their low-energy Effective Field Theory (EFT) descriptions. Building on the Matchete package, which provides a convenient interface for defining BSM models and deriving their EFTs via matching, our extension obtains the Lagrangian in the broken phase of the electroweak symmetry, performs automatic gauge fixing, computes all Feynman rules, imposes flavor symmetries, and exports the model in the UFO format. This significantly streamlines BSM and EFT analyses, as we illustrate with an EFT validity study for a multi-channel leptoquark search. As an application, we provide a complete UFO implementation of the Standard Model EFT up to dimension eight using the $M_W$ electroweak input scheme.
Source: arXiv (Cornell University)
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: TRR 257: Phänomenologische Elementarteilchenphysik nach der HiggsEntdeckung, Matching and Running: Improved Precision in the Hunt for New Physics, G2645866196, G2946282769, EXC 2118: Precision Physics, Fundamental Interactions and Structure of Matter (PRISMA+), Automated Effective Field Theories
OpenAlex ID: W7214285037