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X(3872) and Other Possible Heavy Molecular States | Xiang Liu
; Zhi-Gang Luo
; Yan-Rui Liu
; Shi-Lin Zhu
; | Date: |
1 Aug 2008 | Abstract: | We perform a systematic study of the possible molecular states composed of a
pair of heavy mesons such as $Dar D$, $D^astar D$, $D^ast ar D^ast$ in
the framework of the meson exchange model. The exchanged mesons include the
pseudoscalar, scalar and vector mesons. Through our investigation, we find that
(1) the structure X(3764) is not a molecular state; (2) There exists strong
attraction in the range $r < 1$ fm for the $D^*ar D^*$ system with $J=0, 1$.
If future experiments confirm $Z^+(4051)$ as a loosely bound molecular state,
its quantum number is probably $J^{P}=0^+$. Its partner state $Phi^{**0}$ may
be searched for in the $pi^0chi_{c1}$ channel; (3) The vector meson exchange
provides strong attraction in the $D^ast ar D$ channel together with the
pion exchange. A bound state solution exists with a reasonable cutoff parameter
$Lambdasim 1.4$ GeV. X(3872) may be accommodated as a molecular state
dynamically although drawing a very definite conclusion needs further
investigation; (4) The $B^ast ar B$ molecular state exists. | Source: | arXiv, 0808.0073 | Services: | Forum | Review | PDF | Favorites |
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