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Volume 336 - XIII Quark Confinement and the Hadron Spectrum (Confinement2018) - C: Heavy quarks
On the origin of Y(4260) and the $J^{PC}=1^{--}$ exotic mesons
S. Takeuchi,* M. Takizawa
*corresponding author
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Pre-published on: 2019 September 12
Published on: 2019 September 26
The $q{\bar q} s{\bar s}$ and $q{\bar q} c{\bar c}$ $J^{PC}=1^{--}$ systems are investigated by a quark hadron hybrid model, where the 14 relevant two-meson channels are coupled, while the quark degrees of freedom appear in the short range region. In each of the $q{\bar q} s{\bar s}$ and $q{\bar q} c{\bar c}$ systems, one or more poles have been found. For the $q{\bar q} c{\bar c}$, a pole with a very narrow width appears very close to the $\omega \chi_{c1}$ threshold, which is also close to the ${\bar D} D_1$ and ${\bar D} D_1'$ thresholds. There are two poles in the $q{\bar q} s{\bar s}$, both of which have a rather larger width. We argue that they can be seeds of the observed exotic mesons like the $Y(4260)$.
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