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Proton Spin Decomposition via QCD Sum Rules
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abstract
We present a novel approach for investigating the spin structure of hadrons based on the two-point function in quantum field theory. In a rotating frame, we derive two independent expressions of the two-point function and identify their equivalence, which allows for a complete decomposition of the total spin of a composite system into the angular momenta of its constituent particles. Applying this approach to the proton, we analyze its spin structure in the massless quark limit. Our results indicate that the quark spin contribution accounts for approximately 27$\%$ of the total proton spin at a low-energy scale, significantly deviating from the prediction of the non-relativistic quark model.
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Cited by 1 Pith paper
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Spin structure of spin-1 charmonium states near $T_c$
The paper derives spin-decomposed Wilson coefficients for the twist-2 gluon condensate and uses them to argue that charmonium spin fractions shift by a few percent near T_c, with the total spin unchanged by definition.
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