The omega-rho meson mass splitting and mixing from lattice QCD

Abstract

We compare flavour singlet and non-singlet vector mesons from first principles using lattice QCD. With N_f=2 flavours of light quark, this addresses the omega-rho 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 omega-rho mixing effects arising within QCD through the u-d quark mass difference.

12 pages 4 figures

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• Scaling and ChPT Description of Pions from N_f=2 twisted mass QCD
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