  We explore the temperature dependence of the heavy-quarkonium interaction
based on the Bhanot-Peskin leading order perturbative QCD analysis. The Wilson
coefficients are computed solving the Schrodinger equation in a screened
Coulomb heavy-quark potential. The inverse Mellin transform of the Wilson
coefficients then allows for the computation of the 1S and 2S heavy-quarkonium
gluon and pion total cross section at finite screening/temperature. As a
phenomenological illustration, the temperature dependence of the 1S charmonium
thermal width is determined and compared to recent lattice QCD results.
