Progress on meson-glueball mixing in lattice gauge theories coupled to fermions in multiple representations

We present preliminary results from our numerical lattice investigation of the low-lying flavour-singlet bound states in the $\mathrm{S}\mathrm{p}(4)$ gauge theory coupled to fermions transforming in the fundamental and two-index antisymmetric representations. We use the Wilson gauge action and Wilson fermions. We employ the generalized eigenvalue problem (GEVP) method with a basis of smeared glueball and meson interpolating operators. We analyse two high-statistics ensembles with the same lattice coupling and different fermion mass. We study both the scalar and pseudoscalar states. We observe the first evidence for meson-glueball mixing in this theory. We improve upon previous determinations of the energy eigenstates and mixing angles in the flavour-singlet pseudoscalar sector.