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Abstract: 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 = 0.02445 at the physical point. This is in a goodagreement with our earlier calculation from the nucleon spectrum through theFeynman-Hellmann theorem.



Autor: JLQCD collaboration: K. Takeda, S. Aoki, S. Hashimoto, T. Kaneko, T. Onogi, N. Yamada

Fuente: https://arxiv.org/







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