Leptonic Scalars and Collider Signatures in a UV-complete Model

Abstract

We study the non-standard interactions of neutrinos with light leptonic scalars ($\varphi$) 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 $H^{\pm \pm }\to W^{\pm }{W}^{\pm }\varphi$ and $H^{\pm }\to W^{\pm }\varphi$ 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 $H^{\pm \pm }$ can reach up to 800 (500) GeV and 1.1 (0.8) TeV at the $2\sigma (5\sigma )$ 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 $2\sigma (5\sigma )$ significance, respectively. We also demonstrate that the mass of $\varphi$ 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.

47 pages, 11 tables, 13 figures; one more subsection added for the intermediate Yukawa coupling scenario; other minor changes and more references; version published in JHEP

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