The $\eta$ and ${\eta }^{\prime }$ mesons from Lattice QCD

Abstract

The large mass of the ninth pseudoscalar meson, the ${\eta }^{\prime }$, is believed to arise from the combined effects of the axial anomaly and the gauge field topology present in QCD. We report a realistic, 2+1 flavor, lattice QCD calculation of the $\eta$ and ${\eta }^{\prime }$ masses and mixing which confirms this picture. The physical eigenstates show small octet-singlet mixing with a mixing angle of $\theta =-14.1(2.8{)}^{\circ }$. Extrapolation to physical light quark mass gives, with statistical errors only, $m_{\eta }=573(6)$ MeV and $m_{{\eta }^{\prime }}=947(142)$ MeV, consistent with the experimental values of 548 MeV and 958 MeV.

4 pages, 5 figures

References in corpus (2)

• eta' meson From Two Flavor Dynamical Domain Wall Fermions
• Methods for Pseudoscalar Flavour-Singlet Mesons with Staggered Fermions

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• Properties of pseudoscalar flavour-singlet mesons from 2+1+1 twisted mass lattice QCD
• Error reduction technique using covariant approximation and application to nucleon form factor
• Phenomenology from the Lattice
• Recent Progress in Lattice QCD
• Lattice calculations of Ds to eta and eta' decay form factors