Abstract
∆L = 2 lepton number violation (LNV) at the TeV scale could provide an alternative interpretation of positive signal(s) in future neutrinoless double beta (0νββ) decay experiments. An interesting class of models from this point of view are those that at low energies give rise to dimension-9 vector operators and a dimension-7 operator, both of whose 0νββ-decay rates are “chirally suppressed”. We study and compare the sensitivities of 0νββ-decay experiments and LHC searches to a simplified model in this class of TeV-scale LNV that is also SU(2)L × U(1)Y gauge invariant. The searches for 0νββ decay, which are here diluted by a chiral suppression of the vector operators, are found to be less constraining than LHC searches whose reach is increased by the assumed kinematic accessibility of the mediator particles. For the chirally suppressed dimension-7 operator generated by TeV-scale mediators, in contrast, 0νββ-decay searches place strong constraints on the size of the new Yukawa coupling. Signals of this model at the LHC and 0νββ-decay experiments are entirely uncorrelated with the observed neutrinos masses, as these new sources of LNV give negligible contributions to the latter. We find the prospects for the high-luminosity LHC and ton-scale 0νββ-decay experiments to uncover the chirally-suppressed mechanism with TeV-scale LNV to be promising. We also comment on the sensitivity of the 0νββ-decay lifetime to certain unknown low-energy constants that in the case of dimension-9 scalar operators are expected to be large due to non-perturbative renormalization.
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Graesser, M.L., Li, G., Ramsey-Musolf, M.J. et al. Uncovering a chirally suppressed mechanism of 0νββ decay with LHC searches. J. High Energ. Phys. 2022, 34 (2022). https://doi.org/10.1007/JHEP10(2022)034
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DOI: https://doi.org/10.1007/JHEP10(2022)034