Understand
We calculate the nucleon strange quark content directly from disconnected three-point functions.
- Numerical simulations are carried out in two-flavor QCD using the overlap quark action with up and down quark masses down to a fifth of the physical strange quark mass.
- To improve the statistical accuracy, we calculate the nucleon two-point functions with the low-mode averaging technique, whereas the all-to-all quark propagator is used for the disconnected quark loop.
- We obtain the y parameter, which is the ratio of the strange and light quark contents, y = 0.024(45) at the physical point.
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