The ω-ρ meson mass splitting and mixing from lattice QCD

We compare flavour singlet and non-singlet vector mesons from first principles using lattice QCD. With Nf=2 flavours of light quark, this addresses the ω-ρ mass difference. Using maximally twisted-mass lattice QCD, we are able for the first time to determine this mass difference precisely and we compare with experiment. We also discuss ω-ρ mixing effects arising within QCD through the u-d quark mass difference.