A Comprehensive Four-Quark Interpretation of Ds(2317), Ds(2457) and Ds(2632)
Abstract
The recently observed new member of the charm-strange family Ds(2632) which has a surprisingly narrow width is challenging our theory. Ds(2317) and Ds(2457) which were observed earlier have similar behaviors and receive various theoretical explanations. Some authors use the heavy hadron chiral effective theory to evaluate heavy-light quark systems and obtain a reasonable evaluation on the masses of Ds(2317) and Ds(2457). An alternative picture is to interpret them as four-quark or molecular states. In this work, we are following the later and propose a unitive description for all the three new members Ds(2632), Ds(2317) and Ds(2457) and at least, so far our picture is consistent with the data.
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