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$Y(4260)$ as the first $S$-wave open charm vector molecular state? · Around

2013

$Y(4260)$ as the first $S$-wave open charm vector molecular state?

Cleven, Martin, Wang, Qian, Guo, Feng-Kun et al.

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Since its first observation in 2005, the vector charmonium $Y(4260)$ has turned out to be one of the prime candidates for an exotic state in the charmonium spectrum.

It was recently proposed that the $Y(4260)$ should have a prominent $D_1\bar{D}+c.c.$ molecular component that is strongly correlated with the production of the charged $Z_c(3900)$.
In this paper we demonstrate that the nontrivial cross section line shapes of $e^+e^-\to J/\psi\pi\pi$ and $h_c\pi\pi$ can be naturally explained by the molecular scenario.
As a consequence we find a significantly smaller mass for the $Y(4260)$ than previous studied.

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