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Loop-level lepton flavor violation and diphoton signals in the minimal left-right symmetric model

Shufang Qiang1, Peiwen Wu1,*, and Yongchao Zhang1,2,†

  • *Contact author: pwwu@seu.edu.cn
  • †Contact author: zhangyongchao@seu.edu.cn
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Phys. Rev. D 113, 095044 – Published 29 May, 2026

DOI: https://doi.org/10.1103/8ghn-vyqk

Abstract

The left-right symmetric model (LRSM) could not only restore parity of the weak interaction, but also provide natural explanations of the tiny active neutrino masses via the seesaw mechanisms. The SU(2)R-breaking scalar H3 can induce lepton flavor violating (LFV) effects in the minimal version of LRSM at the 1-loop order, originating from the mixing of heavy right-handed neutrinos (RHNs). If H3 is light, say below the GeV scale, it will lead to rich signals, e.g., the LFV muon and tauon decays ℓβ→ℓα+X (X being either visible or invisible final states) and the anomalous supernova signatures. Combined with the diphoton coupling of H3, and recasting the existing constraints onto the light H3 scenario, the right-handed scale vR is excluded up to 2×109  GeV. In the future, the vR scale can be probed up to 5×109  GeV in high-precision muon experiments, if the Yukwa couplings for RHN masses are of order one and the RHN mixing is maximal, and further up to 6×1011  GeV by supernova observations, reaching the nonresonant leptogenesis scale in the LRSM.

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Phys. Rev. D 113, 095044– Published 29 May, 2026
  • Received 21 January 2026
  • Accepted 4 May 2026
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