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Charmonium and meson-molecule hybrid tetraquarks - Vector meson width and the isospin breaking in the X(3872) decay | | Sachiko Takeuchi
; Kiyotaka Shimizu
; Makoto Takizawa
; | | Date: |
17 Oct 2011 | | Abstract: | In the X(3872) decay, both of the J/psipipi and J/psipipipi
branching fractions are observed experimentally, and their sizes are comparable
to each other. In order to clarify the mechanism to cause such a large isospin
violation, we investigate X(3872) employing a model of coupled-channel
two-meson scattering with a ccbar core. The two-meson states consist of
D0Dbar*0, D+Dbar*-, J/psi
ho, and J/psiomega. The effects of the
ho and
omega meson width are also taken into account.
We calculate the transfer strength from the ccbar core to the final two-meson
states. It is found that very narrow J/psi
ho and J/psiomega peaks appear
very close to the D0Dbar*0 threshold for a wide range of variation in the
parameter sets. The size of the J/psi
ho peak is almost the same as that of
J/psiomega, which is consistent with the experiments. The large width of the
ho meson makes the originally small isospin violation by about five times
larger. | | Source: | arXiv, 1110.3694 | | Services: | Forum | Review | PDF | Favorites | |
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