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.
Charmonium spectra at finite temperature from QCD sum rules with the maximum entropy method
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abstract
Charmonia spectral functions at finite temperature are studied using QCD sum rules in combination with the maximum entropy method. This approach enables us to directly obtain the spectral function from the sum rules, without having to introduce any specific assumption about its functional form. As a result, it is found that while J/psi and eta_c manifest themselves as significant peaks in the spectral function below the deconfinement temperature T_c, they quickly dissolve into the continuum and almost completely disappear at temperatures between 1.0 T_c and 1.1 T_c.
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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.