Mixed five-point correlators in the 3d Ising model

We study five-point correlators of the σ, ϵ, and ϵ′ operators in the critical 3d Ising model. We consider the σ × σ and σ × ϵ operator product expansions (OPEs) and truncate them by including a finite set of exchanged operators. We approximate the truncated operators by the corresponding contributions in appropriate disconnected five-point correlators. We compute a number of OPE coefficients that were previously unknown and show that these are consistent with predictions obtained using the fuzzy sphere regularization of the critical 3d Ising model.