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Lattice Calculation Of Nucleon Isovector Axial Charge With Improved Currents, Jian Liang, Yi-Bo Yang, Keh-Fei Liu, Andrei Alexandru, Terrence Draper, Raza Sabbir Sufian
Lattice Calculation Of Nucleon Isovector Axial Charge With Improved Currents, Jian Liang, Yi-Bo Yang, Keh-Fei Liu, Andrei Alexandru, Terrence Draper, Raza Sabbir Sufian
Physics and Astronomy Faculty Publications
We employ dimension-4 operators to improve the local vector and axial-vector currents and calculate the nucleon isovector axial coupling g3A with overlap valence on 2 + 1-flavor domain wall fermion (DWF) sea. Using the equality of g3A from the spatial and temporal components of the axial-vector current as a normalization condition, we find that g3A is increased by a few percent towards the experimental value. The excited-state contamination has been taken into account with three time separations between the source and sink. The improved axial charges g3A(24I) = 1.22(4)(3) …