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

Understand

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.