Abstract
Early data with respect to heavy exotic mesons with narrow width (≤ 80MeV) found in π p reactions by Andersonet al. and Baudet al. in 1969–1970 are analyzed using the diquark cluster model. It is shown that the simple mass formula of the diquark cluster model, which involves no free parameters, can clearly reproduce the mass spectrum for the heavy exotic mesons indicated by the empirical data.
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