%0 Journal Article %T Unitarity of Singh-Hagen Model in Dimensions %A Mendon£¿a %A Elias L. %A Schimidt Bittencourt %A R. %J - %D 2020 %R https://doi.org/10.1155/2020/8425745 %X The particle content of the Singh-Hagen model (SH) in dimensions is revisited. We suggest a complete set of spin-projection operators acting on totally symmetric rank-3 fields. We give a general expression for the propagator and determine the coefficients of the SH model confirming previous results of the literature. Adding source terms, we provide a unitarity analysis in dimensions. In addition, we have also analyzed the positivity of the massless Hamiltonian %U https://www.hindawi.com/journals/ahep/2020/8425745/