2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/191509To properly discover a charged Higgs Boson ($H^\pm$) requires its spin and couplings to be determined. We investigate how to utilize $\ttbar$ spin correlations to analyze the $H^\pm$ couplings in the decay $t\to bH^+\to bτ^+ν_τ$. Within the framework of a general Two-Higgs-Doublet Model, we obtain results on the spin analyzing coefficients for this decay and study in detail its spin phenomenology, focusing on the limits of large and small values for $\tanβ$. Using a Monte Carlo approach to simulate full hadron-level events, we evaluate systematically how the $H^\pm\toτ^\pmν_τ$ decay mode can be used for spin analysis. The most promising observables are obtained from azimuthal angle correlations in the transverse rest frames of $t(\bar{t})$. This method is particularly useful for determining the coupling structure of $H^\pm$ in the large $\tanβ$ limit, where differences from the SM are most significant.28 pages, 13 figures. Uses JHEP formatHigh Energy Physics - Phenomenologytext