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  • Open Access

Probing flavor-diagonal couplings of doubly charged scalar at low and high energies

Gang Li1,2,* and Jin Sun3,†

  • *Contact author: ligang65@mail.sysu.edu.cn
  • †Contact author: sunjin0810@ibs.re.kr
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Phys. Rev. D 114, 015027 – Published 17 July, 2026

DOI: https://doi.org/10.1103/khts-4dcn

Abstract

We investigate the phenomenology of a TeV-scale doubly charged scalar from the right-handed sector within the framework of left-right symmetric models. Focusing on its flavor-diagonal couplings to right-handed electrons and muons, we assess probes from both high-energy colliders and low-energy precision experiments. High-energy processes include Bhabha scattering at LEP and future circular electron-positron colliders, direct production at the LHC, and dedicated searches and precision measurements at proposed muon colliders and μTRISTAN. Low-energy observables encompass parity-violating Møller scattering, muon anomalous magnetic moment, and muonium-antimuonium oscillations. Our combined analysis indicates that, for a doubly charged scalar in the 1–3 TeV range, the flavor-diagonal Yukawa couplings to electrons and muons as small as 10−2 are accessible. Observations of such a doubly charged scalar would potentially point toward the type-I seesaw mechanism of neutrino masses in the left-right symmetric model with D-parity breaking.

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Phys. Rev. D 114, 015027– Published 17 July, 2026
  • Received 11 December 2025
  • Accepted 23 June 2026
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