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Abstract |
We have made a thorough study of the D+ -> c+ririreaction, recently measured by the Beijing Spectrometer III Collaboration, which shows an abnormal strength at high invariant masses in the cri mass distribution. We studied in detail the triangle mechanism and the f0(1370) excitation modes that have been suggested to explain this abnormal feature, and concluded that they are too small to have any important role in the solution to that problem. We have also studied other possible solutions, evaluating the contribution of excitations of other f0, a0 and f2 resonances, and reached the same conclusion. Unexpectedly, the solution to the problem is found considering the f0(980) excitation, with the f0(980) decaying to two ri, which is tied to the a0(980) production, and well under control. At the same time, the consideration of the f0(980) excitation solves another nonreported problem, which is the riri mass distribution that comes when only the a0(980) resonance is allowed to be excited, which produces a large deficiency at low invariant masses compared with experiments. |
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