Towards a dynamical understanding of the non-$D\bar{D}$ decay of $\psi (3770)$

Abstract

We investigate the $\psi (3770)$ non-$D\bar{D}$ decays into $VP$, where $V$ and $P$ denote vector and pseudoscalar mesons, respectively, via OZI-rule-evading intermediate meson rescatterings in an effective Lagrangian theory. By identifying the leading meson loop transitions and constraining the model parameters with the available experimental data for $\psi (3770)\to J/\psi \eta$, $\varphi \eta$ and $\rho \pi$, we succeed in making a quantitative prediction for all $\psi (3770)\to VP$ with $B{R}_{VP}$ from 0.41% to 0.64%. It indicates that the OZI-rule-evading long-range interactions are still playing a role in $\psi (3770)$ strong decays, and could be a key towards a full understanding of the mysterious $\psi (3770)$ non-$D\bar{D}$ decay mechanism.

5 pages, 2 figures, proofread version to appear on Phys. Rev. Lett

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