Abstract :
[en] The strongly coupled phase of Yang-Mills plasma with arbitrary gauge group 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 set up), is analyzed in a non-perturbative scat-
tering formalism with the input of lattice-QCD static potentials. Glueballs are actually found to
be bound up to 1.3 Tc. Starting from the T-matrix, the plasma equation of state is computed
by resorting to Dashen, Ma and Bernstein's formulation of statistical mechanics and favorably
compared to quenched lattice data. Special emphasis is put on SU(N) gauge groups, for which
analytical results can be obtained in the large-N limit, and predictions for a G2 gauge group are
also given within this work
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