Quark coalescence into opposite parity baryon states

The speculations on the nature of quark gluon plasma (QGP) has a long history. It was assumed, that due to the large momenta of quarks and gluons in the plasma phase, the interaction between them become negligible small as a consequence of the running coupling constant. This idea of non interacting massless quarks and gluons in a big bag was used by many authors, e.g. the authors listed in Ref. [ 1]. However, it became clear soon, that conditions necessary to create such a plasma, as depicted in the cartoon (see Fig. 1), cannot be fulfilled in the heavy ion collisions. The collision time is too short, the volume is too small, the temperature is too low to produce this massless QGP. Therefore the investigations developed in the direction, that what is the structure of the matter produced in the heavy ion reactions. (Unfortunately strongly different structures were also named ”quark gluon plasma”. Thus it is high time to use different names for the different, well defined matter structures.) One of the most important qualifiers to characterize the matter is the dominant degree of freedom. In the original quark gluon plasma investigations the dominant degrees of freedom were the massless quarks and gluons. With the realization, that at the hadronization stage these quarks interact strongly, the constituent quarks, which have large effective mass, were considered the dominant degrees of freedom. This development brought up the idea of coalescence hadronization [ 2].