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

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

2010-11-09

arxiv.org/abs/1011.1964v2

Phys.Rev.D83:114506,2011

Physics

High Energy Physics

High Energy Physics - Lattice

31 pages, 22 figures; version published in PRD

Scientific paper

10.1103/PhysRevD.83.114506

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.

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