2025/09/10 by Dzung Tri Tran, Tran, Dzung Tri, Pham, Quang Hoang-Minh +4
Physics and Astronomy · Computer Science · #Particle physics theoretical and experimental studies #Computational Physics and Python Applications #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.2509.08417
In this work, we study the one-loop--induced decay channel H± → W±γ in the general Rξ gauge within Two Higgs Doublet Models. We analytically verify the gauge invariance (ξ-independence), ultraviolet finiteness, and renormalization-scale independence of the one-loop form factors, thereby confirming the consistency of our calculations. On the phenomenological side, we perform a parameter scan of the Type-I THDM and, based on the viable parameter space, evaluate the branching ratios of this decay process. Furthermore, we investigate charged Higgs pair production at muon-TeV colliders through the representative processes μ+μ- → H+H- → W+W- hγ and μ+μ- → γγ→ H+H- → W+W- hγ, as typical applications of our results. The events for the processes are computed within the allowed parameter regions of the Type-I THDM. The corresponding signal significances are evaluated, including the relevant Standard Model backgrounds, at a center-of-mass energy of √(s) = 3~TeV. With the high integrated luminosity expected at muon-TeV colliders, reaching up to L = 3000~fb-1, our analysis indicates that the signals can be detected with a statistical significance of 5σ for several benchmark scenarios in the viable parameter space of the Type-I THDM.