Comprehensive four-quark interpretation of Ds(2317), Ds(2457), and Ds(2632).
The recently observed new member of the charm-strange family D(s)(2632), which has a surprisingly narrow width, is challenging our theory. D(s)(2317) and D(s)(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 D(s)(2317) and D(s)(2457). An alternative picture is to interpret them as four-quark or molecular states. In this work, we are following the latter and propose a unitive description for all three new members, D(s)(2632), D(s)(2317), and D(s)(2457), and, at least, so far our picture is consistent with the data.
Chen
Yu-Qi
YQ
Institute of Theoretical Physics, Chinese Academy of Sciences, 100080 Beijing, China.
Li
Xue-Qian
XQ