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Masses of open- and hidden-charm tetra-quark scalar mesons are studied in anew approach. As the result, newly estimated masses of hidden-charm sector aresignificantly lower than our earier ones by a naive quark counting. Inparticular, our new result on the non-strange iso-triplet scalar mesons shouldbe compared with the experiment that an indication of tiny eta pi peak around3.2 GeV has been observed, while no signal in the eta_c pi channel.

Open- and hidden-charm tetra-quark scalar mesons