PRODUCTION OF Q(Q)OVER-BAR-G HYBRID MESONS IN N(N)OVER-BAR-N ANNIHILATION

Nucleon-antinucleon (NNBAR) annihilation reactions provide a copious s ource for the production of gluons (g) through the destruction of quar k-antiquark (QQBAR) pairs in the initial state. Therefore, in addition to the production of the usual QQBAR meson states, NNBAR annihilation can serve as an entrance channel to mesonic resonances containing dyn amical excitations of the gluon field g, for instance hybrids (QQgBAR) . We discuss the main features of the spectrum and decay modes for the se hybrid mesons. Particularly, we focus on the production mechanism i n NNBAR annihilation, thereby employing a microscopic model with const ituent quarks and gluons. Branching ratios for hybrid production are f ound to be strongly dependent on the quantum numbers and kinematical f actors associated with the transition. We specifically emphasize the d ependence on the relative orbital angular momentum L of the NNBAR syst em, explorable at NNBAR annihilation at rest (L=0,1). Favorable cases for the production and decay modes of hybrid mesons, accessible for me asurements by Crystal Barrel at LEAR, are discussed.