Abstract
We study the non-standard interactions of neutrinos with light leptonic scalars (ϕ) in a global (B − L)-conserved ultraviolet (UV)-complete model. The model utilizes Type-II seesaw motivated neutrino interactions with an SU(2)L-triplet scalar, along with an additional singlet in the scalar sector. This UV-completion leads to an enriched spectrum and consequently new observable signatures. We examine the low-energy lepton flavor violation constraints, as well as the perturbativity and unitarity constraints on the model parameters. Then we lay out a search strategy for the unique signature of the model resulting from the leptonic scalars at the hadron colliders via the processes H±±→ W±W±ϕ and H±→ W±ϕ for both small and large leptonic Yukawa coupling cases. We find that via these associated production processes at the HL-LHC, the prospects of doubly-charged scalar H±± can reach up to 800 (500) GeV and 1.1 (0.8) TeV at the 2σ (5σ) significance for small and large Yukawa couplings, respectively. A future 100 TeV hadron collider will further increase the mass reaches up to 3.8 (2.6) TeV and 4 (2.7) TeV, at the 2σ (5σ) significance, respectively. We also demonstrate that the mass of ϕ can be determined at about 10% accuracy at the LHC for the large Yukawa coupling case even though it escapes as missing energy from the detectors.
Highlights
Rejection Features0.0 0.2 Sig0n.a4l Effic0ie.6ncy 0.8 1.0M_eff M_jet MET minM_jj M_ll dR_ll mT_lep mT_jet minDR_jj dphi_ll_MET200 400 6S0c0ore800 1000 1200response around 0 means the event is more background-like
We lay out a search strategy for the unique signature of the model resulting from the leptonic scalars at the hadron colliders via the processes H±± → W ±W ±φ and H± → W ±φ for both small and large leptonic Yukawa coupling cases
We demonstrate that the mass of φ can be determined at about 10% accuracy at the LHC for the large Yukawa coupling case even though it escapes as missing energy from the detectors
Summary
We present a global (B − L)-conserved UV-complete model of a leptonic scalar, which is motivated by the well-known Type-II seesaw model [16–21]. In a large region of parameter space, the dilepton channels H±± → ± ± and diboson channel H±± → W ±W ± are highly suppressed respectively by the small Yukawa couplings Yαβ and the small VEV v∆ of the triplet, and the doubly-charged scalar H±± decays mostly via the cascade channel above. In the standard Type-II seesaw model the singly-charged scalar H± can decay into ±ν and hW ±, ZW ±, tb, which are respectively proportional to the couplings Yαβ and v∆ [34]. When both Yαβ and v∆ are relatively small, the decay of H± will be dominated by. H±± will decay mostly to ± ± if the Yukawa couplings are large, while the W ±W ±φ channel is dominant for small Yukawa couplings a crossover happens for low MH±±, as shown in the top right panel
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