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$$X(3872)$$ in the hybrid model of charmonium and hadronic molecule

Yamaguchi, Yasuhiro  ; Takeuchi, Sachiko*; Takizawa, Makoto*; Hosaka, Atsushi

$$X(3872)$$ has been known as a candidate of the exotic hadron, while the nature has not been understood yet. The mass spectrum of $$X(3872)$$, near the $$D^0bar{D}^{ast 0}$$ threshold, indicates the $$D^0bar{D}^{ast 0}$$ composite structure, so called a hadronic molecule. On the other hand, measurements of the production ratio prefer the compact $$cbar{c}$$ structure. To understand the nature of $$X(3872)$$, we employ the hybrid model with the charmonium $$(cbar{c})$$ and hadronic molecular components, and study a mass spectrum and decay properties. The model reasonably reproduces the $$X(3872)$$ spectrum, where the $$cbar{c}-D^0bar{D}^{ast 0}$$ coupling plays an important role. We also introduce the $$J/psirho$$ and $$J/psiomega$$ molecular components and find that the finite width of $$rho$$ and $$omega$$ is important to explain the pole position appearing above the $$D^0bar{D}^{ast 0}$$ threshold.

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