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Controlling excited-state contamination in nucleon matrix elements

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Figure

FIG. 1. A comparison of the errors in the pion and the proton effective mass data with zero versus twenty stout smearing of links prior to Gaussian smearing
FIG. 2. Comparison of estimates of unrenormalized g A obtained with σ ¼ 9 and t sep ¼ 12 from the two different ‘ runs R3 and R4.
FIG. 4. Nucleon effective mass at zero momentum as a function of Euclidean time t. (Top) Results for smearing size σ ¼ 3 , 5, 7, 9; (Middle) comparison of σ ¼ 3 , 5, 7 single smearing data with the variational data V357; and (Bottom) comparison of σ ¼ 5 ,
FIG. 5. Plot of the effective mass for the excited state evaluated from the S 5 S 5 , S 9 S 9 and V579 nucleon correlation functions after subtraction of the respective ground state fit.
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