Possible Molecular Explanation for the Resonance $Y(4500)$

Abstract

The BESIII collaboration has discovered a new state with hidden charm-strange. Its mass is intriguingly close to the $ D_s\bar{D}_{s1} $ threshold and does not have the properties of the charmonium states. Working with the QCD sum rules (QCDSR) approach, we test if the charmonium-like structure $ Y (4500) $, detected in the invariant mass spectrum $ K^+ K^-J/\psi$ may be interpreted as an exotic $ D_s\bar{D}_{s1} $ molecular structure with $ J^{PC}=1^{--} $. Considering the contributions of QCD condensates up to operator dimension ten, we estimate the mass and decay constant of $Y(4500)$ resonance. We get $ m_Y = (4488.35 \pm 11.54) $ MeV in excellent agreement with the meson mass reported by BESIII and $ f_Y=(4.04 \pm 0.36)\times 10^{-3} $$ \mathrm{GeV^4} $. Our findings indicate that a pseudoscalar-axialvector molecule current can well describe this state.