Topological susceptibility in the SU(3) gauge theory

We compute the topological susceptibility for the SU(3) Yang–Mills theory by employing the expression of the topological charge density operator suggested by Neuberger’s fermions. In the continuum limit we find r_0^4 chi = 0.059(3), which corresponds to chi=(191 +/- 5 MeV)^4 if F_K is used to set the scale. Our result supports the Witten–Veneziano explanation for the large mass of the eta’.