Comprehensive Four-Quark Interpretation ofDs(2317),Ds(2457),

Abstract

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.

PossibleBK¯molecular structure ofBs0*(5725)in the Be

“…Its narrow decay width stimulates both experimental and theoretical interests. In order to understand the structure of this new state, various pictures for its structure are assumed such as the traditional c" s state [2][3][4][5][6][7], the exotic meson state [8][9][10], and the DK bound state [11][12][13][14][15][16]. By analyzing the experimental data, it is suggested that the quantum numbers of D Ã s0 ð2317Þ þ are IðJ P Þ ¼ 0ð0 þ Þ.…”

Masses and decay constants of the Ds0*(2317) and DBali1, Collins2, Cox3 et al. 2017Phys. Rev. D106131611View full textAdd to dashboardCite

“…J P = 0 − , 1 − , for the l = 0 doublet and 0 + , 1 + and 1 + , 2 + * s2 (2573)) mesons, respectively. Nevertheless, the surprisingly low masses of the D * s0 (2317) and D s1 (2460) mesons have led to a number of more exotic interpretations, for example, as tetraquarks [19][20][21], molecules [22,23] or conventional charm-strange mesons with coupled channel effects [24]. A recent comprehensive review of the experimental status and theoretical understanding of these states can be found in Ref.…”

DKmolecule in the Bethe-Salpeter equation approach in the heavy quark limit

“…The measured mass of this state is 2317:8 AE 0:6 MeV and the current results for the quantum numbers of isospin, spin, and parity are IðJ P Þ ¼ 0ð0 þ Þ [2]. Since its decay width is very narrow (À < 3:8 MeV), there are many theoretical works to study its structure with different models, such as a c" s state [3][4][5][6], a four-quark state [7,8], and a c" s mixed with four-quark state [9]. Because the mass of the state D Ã s0 ð2317Þ þ lies slightly below the threshold of D and K mesons, D Ã s0 ð2317Þ þ can also be viewed as an S-wave DK bound state based on the hadronic molecule picture [10][11][12][13][14][15][16][17][18].…”