A Comprehensive Four-Quark Interpretation of D_s(2317), D_s(2457) and D_s(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 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.Comment: 6 page

(3,6-Dibromo-o-phenyl­ene)dimethanol

The title compound, C8H8Br2O2, was synthesized from the hydrolysis of 1,4-dibromo-2,3-bis­(bromo­meth­yl)benzene. One intra­molecular O—H⋯O and two intra­molecular C—H⋯Br inter­actions occur. In the crystal, mol­ecules are linked into a chain running parallel to [010]. Adjacent chains are linked into a two-dimensional layer by a combination of inter­molecular O—H⋯O hydrogen bonds and C—H⋯π inter­actions