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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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.