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Study on -wave Elastic Cross Section and Possible Bound States Within a Constituent Quark Model
In the framework of a chiral constituent quark model, considering the
contributions of annihilation and one-gluon annihilation, the
proton-antiproton -wave elastic scattering cross section experimental data
can be reproduced by adjusting properly one-gluon annihilation coupling
constant. Meanwhile, using the fixed model parameter, we do a dynamical
calculation for all possible -wave nucleon-antinucleon states, the results
show that, there is no -wave bound state as indicated by a strong
enhancement at threshold of in and decays.Comment: 15 pages, 8 figure