Hybrid mesons (Q(anti Q)g) in N(anti N) annihilation.

摘要

N(anti N) annihilation reactions provide exciting possibilities to study mesonic resonances beyond the usual Q(anti Q) spectrum. Particularly the search for Q(anti Q)g mesons containing an explicit dynamical excitation of the gluon field is not promising, since hybrids are predicted to display unique features: exotic quantum numbers (J(sup (pi)C)) and dynamical selection rules for their decay modes. The authors have investigated the possibility of producing hybrids from p(anti p) atomic states in reactions of the type N(anti N)(L= 0,1) (yields) (pi) + Q(anti Q)g. Production rates for hybrid mesons are found to display a strong dependence on the quantum numbers and kinematical factors associated with the transition. The dependence on the orbital angular momentum L of the p(anti p) atomic state, accessible in p(anti p) annihilation at rest, would provide a striking signature for the production of hybrids. In estimating branching ratios for the formation of Q(anti Q)g hybrid mesons in N(anti N) annihilation reactions at rest, the authors have employed a microscopic model with constituent quarks and gluons in analogy to the annihilation model for the production of Q(anti Q) mesons. (ERA citation 19:002377)