Nucleon Spin Structures from Lattice QCD: Flavor Singlet Axial and Tensor Charges
Yoshinobu Kuramashi
Abstract
The flavor singlet axial and tensor charges of the nucleon are calculated in lattice QCD. We find ΔΣ=Δu+Δd+Δs=+0.638(54)-0.347(46)-0.109(30) = +0.18(10) for the axial charge and δΣ=δu+δd+δs=+0.839(60)-0.231(55)-0.046(34) = +0.562(88) for the tensor charge. The result for the axial charge shows reasonable agreement with the experiment and that for the tensor charge is the first prediction from lattice QCD before experimental measurements.
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