Relevance of glueball bound states in the Yang-Mills plasma within a many-body T-matrix approach

The strongly coupled phase of Yang-Mills plasma with gauge group SU(3) is studied in a T-matrix approach. The existence of lowest-lying glueballs, interpreted as bound states of two transverse gluons (quasi-particles in a many-body setup), is analyzed in a non-perturbative scattering formalism with the input of lattice-QCD static potentials. The relevance of the singlet and the (colored) octet and 27 channels at finite temperature is discussed. We compute the equation of state of the system in Dashen, Ma and Bernstein's formulation of statistical mechanics and compare to quenched SU(3) lattice data. Further analysis for the general case of SU(N) is envisaged.