Abstract
We consider a rather minimal extension of the Standard Model involving just one extra particle, namely a single SU(2) L singlet scalar S ++ and its antiparticle S −−. We propose a model independent effective operator, which yields an effective coupling of S ±± to pairs of same sign weak gauge bosons, W ± W ±. We also allow tree-level couplings of S ±± to pairs of same sign right-handed charged leptons l ± R l ′ ± R of the same or different flavour. We calculate explicitly the resulting two-loop diagrams in the effective theory responsible for neutrino mass and mixing. We propose sets of benchmark points for various S ±± masses and couplings which can yield successful neutrino masses and mixing, consistent with limits on charged lepton flavour violation (LFV) and neutrinoless double beta decay. We discuss the prospects for S ±± discovery at the LHC, for these benchmark points, including single and pair production and decay into same sign leptons plus jets and missing energy. The model represents a minimal example of the complementarity between neutrino physics (including LFV) and the LHC, involving just one new particle, the S ±±.
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King, S.F., Merle, A. & Panizzi, L. Effective theory of a doubly charged singlet scalar: complementarity of neutrino physics and the LHC. J. High Energ. Phys. 2014, 124 (2014). https://doi.org/10.1007/JHEP11(2014)124
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DOI: https://doi.org/10.1007/JHEP11(2014)124