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We calculate the nucleon strange quark content directly from disconnectedthree-point functions. Numerical simulations are carried out in two-flavor QCDusing the overlap quark action with up and down quark masses down to a fifth ofthe physical strange quark mass. To improve the statistical accuracy, wecalculate the nucleon two-point functions with the low-mode averagingtechnique, whereas the all-to-all quark propagator is used for the disconnectedquark loop. We obtain the y parameter, which is the ratio of the strange andlight quark contents, y = 0.024(45) at the physical point. This is in a goodagreement with our earlier calculation from the nucleon spectrum through theFeynman-Hellmann theorem.

Calculation of nucleon strange quark content with dynamical overlap quarks