Possible Molecular Explanation for the Resonance $$\varvec{Y}$$ (4500)

Abstract

The BESIII collaboration has discovered a new state with hidden charmstrange. Its mass is intriguingly close to the Ds Ds1 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/ψ may be interpreted as an exotic Ds Ds1 molecular structure with J P C = 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 mY = (4488.35 ± 11.54) MeV in excellent agreement with the meson mass reported by BESIII and fY = (4.04 ± 0.36) × 10 −3 GeV 4 . Our findings indicate that a pseudoscalar-axialvector molecule current can well describe this state.