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hep-ph2025
Seesaw Portal to Super Heavy Dark Matter with Symmetry
Cai-Xia Yang, Zhi-Long Han, Fei Huang +2
Right-handed neutrinos are introduced to explain the origin of the tiny neutrino masses via the seesaw mechanism. Required by relatively large Yukawa coupling and leptogenesis,…
hep-ph2025
Lepton Number Violation Higgs Decay at Muon Collider
Fa-Xin Yang, Feng-Lan Shao, Zhi-Long Han +3
In this paper, we consider the scalar singlet extension of type-I seesaw, where a scalar singlet and heavy neutral lepton are further introduced. The Majorana mass term of…
hep-ph2025
Prospects of Portal Dark Matter in
Zhen-Wei Wang, Zhi-Long Han, Fei Huang +2
The gauged model is well-motivated to explain the muon anomaly and dark matter in previous studies. However, the latest NA64 experiment has almost exclude…