Nucleon strange quark content from two-flavor lattice QCD with exact chiral symmetry

Abstract

Strange quark content of the nucleon is calculated in dynamical lattice QCD employing the overlap fermion formulation. For this quantity, exact chiral symmetry guaranteed by the Ginsparg-Wilson relation is crucial to avoid large contamination due to a possible operator mixing with $\bar{u}u+\bar{d}d$. Gauge configurations are generated with two dynamical flavors on a 16^3 x 32 lattice at a lattice spacing a \simeq 0.12fm. We directly calculate the relevant three-point function on the lattice including a disconnected strange quark loop utilizing the techniques of all-to-all quark propagator and low-mode averaging. Our result f_{T_s} = 0.032(8)(22), is in good agreement with our previous indirect estimate using the Feynman-Hellmann theorem.

31 pages, 22 figures; version published in PRD

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• Hadronic Uncertainties in the Elastic Scattering of Supersymmetric Dark Matter
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Cited by in corpus (8)

• FLAG Review 2021
• Twenty-first Century Lattice Gauge Theory: Results from the QCD Lagrangian
• Scalar strangeness content of the nucleon and baryon sigma terms
• Nuclear Reactions from Lattice QCD
• Nucleon Sigma Terms with $N_f=2+1$ O($a$)-improved Wilson fermions
• R-parity violating supersymmetric contributions to the P, CP-odd electron-nucleon interaction at the one-loop level
• Chiral Effective Theory Methods and their Application to the Structure of Hadrons from Lattice QCD
• Baryons and Chiral Symmetry