Production of single doubly charged Higgs bosons at muon colliders

Abstract

In this paper, we study the single production of doubly charged Higgs H±± in the type-II seesaw at the high energy muon collider. Compared with the pair production channel μ+μ−→H++H−−, the single production channel μ+μ−→μ∓ℓ∓H±± in principle could probe the mass region above the threshold mH±±>s/2. The single production channel depends on the Yukawa coupling h, which is related to the neutrino oscillation parameters. We show that the Majorana phases ϕ1 and ϕ2 have great impact on the individual cross section of the single production. We find that the same sign dilepton signature from H±±→ℓ±ℓ± could probe mH±±≲2.6(7.1) TeV at the 3 (10) TeV muon collider when the triplet VEV vΔ≲3 eV. Published by the American Physical Society 2025