Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-07-06
Phys.Rev.Lett.93:232001,2004
Physics
High Energy Physics
High Energy Physics - Phenomenology
6 pages
Scientific paper
10.1103/PhysRevLett.93.232001
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 later and propose a unitive description for all the 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
Li Xue-Qian
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