Journal
JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 11, Pages -Publisher
SPRINGER
DOI: 10.1007/JHEP11(2014)124
Keywords
Beyond Standard Model; Neutrino Physics; Higgs Physics
Categories
Funding
- STFC [ST/J000396/1]
- Marie Curie Intra-European Fellowship within European Community [PIEF-GA-2011-297557]
- NExT Institute
- European Union FP7 ITN-INVISIBLES [PITN-GA-2011-289442]
- STFC [ST/J000396/1, ST/L000296/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/J000396/1, ST/L000296/1] Funding Source: researchfish
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We consider a rather minimal extension of the Standard Model involving just one extra particle, namely a single SU(2)L singlet scalar Sil 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, (WW +/-)-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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