The Problem of Mass: Mesonic Bound States Above Tc
Abstract
By extending the Bielefeld LGS (Lattice Gauge Simulation) color singlet interaction, we find that the masses of pi, sigma, rho and a1 excitations, 32 degrees of freedom in all, go to zero (in the chiral limit) as T -> Tc. This result indicates a smooth phase transition at Tc, at which from above the masses and couplings of mesons vanish `a la Brown-Rho scaling. We discuss that our scenario successfully explains the STAR (STAR Collaboration) rho0/pi- ratio in Au-Au peripheral collisions at RHIC.
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