Spectroscopy of q3 (q)over-bar3 states in quark model and baryon-antibaryon enhancements

We study the mass spectrum of the q(3)(q) over bar (3) mesons both from the common S wave quark model with colormagnetic interactions, and from the quark model with triquark correlations. Two cluster configurations (q(3))-((q) over bar (3)) and (q(2)(q) over bar)-(q (q) over bar (2)) are considered. In the spectrums of both models, we find rather stable states which have the same quantum numbers as the particle resonances which are corresponding to the p (p) over bar enhancement, p <(Lambda)over bar > enhancement, and Lambda <(Lambda)over bar > enhancement with spin-0 or 1. This implies these enhancements are not experimental artifacts. The color-spin-flavor structures of p (p) over bar, p <(Lambda)over bar >, and Lambda <(Lambda)over bar > enhancements are revealed. It has been found that, if there exists quark correlation in the baryonium, the p (p) over bar enhancement as a baryonium is mainly a state of vertical bar(120) over bar (cs),(6) over bar (c),2,3(f)circle plus(3) over bar (f)>vertical bar(120) over bar (cs),6(c),2,(3) over bar (f)circle plus 6(f)> in the configuration (q(2)(q) over bar)-(q (q) over bar (2)), with few mixtures of vertical bar 70(cs),8(c),2,8(f)>vertical bar(70) over bar (cs),8(c),2,8(f)> in the configuration (q(3))-((q) over bar (3)), where the subscripts cs, c, and f indicate colorspin, color, and flavor, respectively. The existence of spin-1 Lambda <(Lambda)over bar >, p <(Lambda)over bar >, p (p) over bar enhancements is predicted.