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PreprintCC BY 4.0arXiv

UFO Sightings with Matchete: Connecting BSM Lagrangians with Event Generators

  • Luis Hourtz
  • Tamilarasan Ketheeswaran
  • Michael Krämer
  • Anders Eller Thomsen
  • Philip Weber
  • Felix Wilsch
Open at sourcePDFDOICite

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 MW electroweak input scheme.

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Cite

BibTeXRIS
BibTeX
@misc{hourtz2026sightings,
  title = {{UFO Sightings with Matchete: Connecting BSM Lagrangians with Event Generators}},
  author = {Luis Hourtz and Tamilarasan Ketheeswaran and Michael Krämer and Anders Eller Thomsen and Philip Weber and Felix Wilsch},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.28619},
  eprint = {2609.28619},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.28619},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - UFO Sightings with Matchete: Connecting BSM Lagrangians with Event Generators
AU  - Luis Hourtz
AU  - Tamilarasan Ketheeswaran
AU  - Michael Krämer
AU  - Anders Eller Thomsen
AU  - Philip Weber
AU  - Felix Wilsch
PY  - 2026
DA  - 2026/09/23
PB  - arXiv
DO  - 10.48550/arxiv.2609.28619
UR  - https://arxiv.org/abs/2609.28619
AB  - 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.
ER  -