Abstract
The unique dimension-5 effective operator, LLHH, known as the Weinberg operator, generates tiny Majorana masses for neutrinos after electroweak spontaneous symmetry breaking. If there are new scalar multiplets that take vacuum expectation values (VEVs), they should not be far from the electroweak scale. Consequently, they may generate new dimension-5 Weinberg-like operators which in turn also contribute to Majorana neutrino masses. In this study, we consider scenarios with one or two new scalars up to quintuplet SU(2) representations. We analyse the scalar potentials, studying whether the new VEVs can be induced and therefore are naturally suppressed, as well as the potential existence of pseudo-Nambu-Goldstone bosons. Additionally, we also obtain general limits on the new scalar multiplets from direct searches at colliders, loop corrections to electroweak precision tests and the W-boson mass.
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Acknowledgments
We are grateful to Andrea Di Iura and Claudia Hagedorn for their participation in the early stages of this project. We also thank Anirban Karan, Emanuela Musumeci, Arcadi Santamaria and Avelino Vicente and for useful discussions. All Feynman diagrams were generated using the TikZ-Feynman package for LATEX [79].
JHG and DV are partially supported by the “Generalitat Valenciana” through the GenT Excellence Program (CIDEGENT/2020/020) and by the Spanish “Agencia Estatal de Investigación”, MICINN/AEI (10.13039/501100011033) grants PID2020-113334GB-I00 and PID2020-113644GB-I00. JHG is also supported by the “Consolidación Investigadora” Grant CNS2022-135592 funded by the Spanish “Agencia Estatal de Investigación”, MICINN/AEI (10.13039/501100011033) and by “European Union NextGenerationEU/PRTR”.
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Giarnetti, A., Herrero-García, J., Marciano, S. et al. Neutrino masses from new Weinberg-like operators: phenomenology of TeV scalar multiplets. J. High Energ. Phys. 2024, 55 (2024). https://doi.org/10.1007/JHEP05(2024)055
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DOI: https://doi.org/10.1007/JHEP05(2024)055