Speaker:	Michihisa Takeuchi (Zhongshan U.)
Title:	Current status of 2HDMs for muon g-2 / Probing right handed neutrinos via try-lepton signals at the LHC
Date (JST):	Wed, Mar 26, 2025, 13:30 - 15:30
Place:	Seminar Room A
Abstract:	We show the implications of the muon anomalous magnetic moment for two-Higgs-doublet models (2HDMs), which are classified according to imposed symmetries and their resulting Yukawa sector. In the minimal setup, the muon g-2 can be accommodated by the type-X (leptophilic) 2HDM, flavor-aligned 2HDM (FA2HDM), muon-specific 2HDM (mu2HDM), and mu-tau-flavor-violating 2HDM. We clarify the available parameter spaces of these 2HDMs and investigate how to probe the remaining parameter regions in future experiments. In particular, we find that, the remaining parameter region of the FA2HDM is almost equivalent to that of the type-X 2HDM, and they are excluded by the latest collider searches for the muon g-2 solution. Neutrino oscillation experiments have provided direct evidence for the existence of neutrino masses. The seesaw mechanism with heavy right-handed neutrino (RHN) states is one of the most attractive ways to explain the smallness of these masses. If the RHN mass is at weak scale and the other new physics interactions are at much higher scale, the physics is described by an effective field theory framework known as N_R-EFT. We study the Wilson coefficients which primarily contribute to the tri-lepton + missing energy signals at the LHC.

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