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arXiv · 2511.10733

FeynRules and UFO models for $\nu$SMEFT: operators of dimensions five and six

Arsenii Titov
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Abstract

We release FeynRules and UFO model files for the $\nu$SMEFT -- the effective field theory of the Standard Model extended with right-handed neutrinos, $N_R$. These model files include operators with $N_R$ up to dimension six. In particular, we provide a UFO implementation of four-fermion operators with Majorana $N$ compatible with MadGraph5_aMC@NLO. It relies on introducing auxiliary, non-propagating fields. All the model files are made publicly available on https://github.com/arsenii-titov/vSMEFT.

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Arsenii Titov. 2025-11-13. FeynRules and UFO models for $\nu$SMEFT: operators of dimensions five and six. https://arxiv.org/abs/2511.10733

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