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2014

Resolving the puzzling decay patterns of charged $Z_c$ and $Z_b$ states

Liu, Xiao-Hai, Ma, Li, Sun, Li-Ping et al.

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We investigate the ratio of the branching fractions of the molecular candidates decaying into the ground and radially excited states within the quark interchange model.

Our numerical results suggest that these molecular candidates are more likely to decay into the radially excited states than into ground states.
Especially, the ratio $\Gamma[Z_c(4430)\to \pi\psi(2S)]$/$\Gamma[Z_c(4430)\to \pi J/\psi]\sim 9.8$ is close to the experimental measurement, which supports the interpretation of $Z_c(4430)$ as the $\bar{D}D^*(2S)$ molecular state.
The ratios of the branching fractions of $Z_b(10610)$ and $Z_b(10650)$ to $\pi\Upsilon(2S, 3S)$ and $\pi\Upsilon(1S)$ agrees very well with Belle's measurement.

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