This paper proposes an intermediate SQGB phase in which quark degrees of freedom are liberated while gluons remain bound in glueballs until about 285 MeV.
Hadron Production in Ultra-relativistic Nuclear Collisions: Quarkyonic Matter and a Triple Point in the Phase Diagram of QCD
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abstract
We argue that features of hadron production in relativistic nuclear collisions, mainly at CERN-SPS energies, may be explained by the existence of three forms of matter: Hadronic Matter, Quarkyonic Matter, and a Quark-Gluon Plasma. We suggest that these meet at a triple point in the QCD phase diagram. Some of the features explained, both qualitatively and semi-quantitatively, include the curve for the decoupling of chemical equilibrium, along with the non-monotonic behavior of strange particle multiplicity ratios at center of mass energies near 10 GeV. If the transition(s) between the three phases are merely crossover(s), the triple point is only approximate.
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A New State of Matter between the Hadronic Phase and the Quark-Gluon Plasma?
This paper proposes an intermediate SQGB phase in which quark degrees of freedom are liberated while gluons remain bound in glueballs until about 285 MeV.