Abstract
We study the transversity distribution and the tensor charge of the nucleon based on the QCD sum rule approach. We also discuss the spin physics in the effective theory, and then analyse the quark contributions to the flavour-singlet axial charge and the tensor charge by means of the quark model. How to build a consistent nonperturbative approach for studying the spin physics and other hadronic physics at low-energy scale is also briefly introduced.
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