Abstract
We study ultra-violet completions for operators in standard model effective field theory extended with right-handed neutrinos (NRSMEFT). Using a diagrammatic method, we generate systematically lists of possible tree-level completions involving scalars, fermions or vectors for all operators at d = 6 and d = 7, which contain at least one right-handed neutrino. We compare our lists of possible UV models to the ones found for pure SMEFT. We also discuss how the observation of LNV processes via NRSMEFT operators at the LHC can be related to Majorana neutrino masses of the standard model neutrinos.
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Acknowledgments
We would like to thank José Santiago for help with the tool MatchMakerEFT [67] and Javier Fuentes-Martín for help with Matchete [49]. M.H. and R.B. acknowledge support by grants PID2020-113775GB-I00 (AEI/10.13039/501100011033) and CIPROM/2021/054 (Generalitat Valenciana). R.B. also acknowledges financial support from the Generalitat Valenciana (grant ACIF/2021/052). R.C. is supported by the Alexander von Humboldt Foundation Fellowship.
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Beltrán, R., Cepedello, R. & Hirsch, M. Tree-level UV completions for NRSMEFT d = 6 and d = 7 operators. J. High Energ. Phys. 2023, 166 (2023). https://doi.org/10.1007/JHEP08(2023)166
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DOI: https://doi.org/10.1007/JHEP08(2023)166