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Long-Distance Contributions to Light Vector Mesons and Radiative Decays of $η_{c}$
In the present work, we investigate the long-distance contributions to light hadrons and radiative decays of $η_c$, where the long-distance contribution is phenomenologically described by the meson loops. Our estimations indicate that the branching fractions of $η_c \to \mathcal{VV},\ \mathcal{V}=(ρ
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