Novel charmonium-like structures in the $J/\psi\phi$ and $J/\psi\omega$ invariant mass spectra

TL;DR

This paper proposes that certain charmonium-like structures observed in invariant mass spectra are molecular states of charmed mesons, providing a unified explanation for multiple observed enhancements in these spectra.

Contribution

The study introduces a molecular charmonium interpretation for Y(4274), Y(4140), and Y(3930), supported by dynamics analysis of pseudoscalar and scalar charmed meson systems.

Findings

Y(4274) is modeled as an S-wave $D_sar{D}_{s0}(2317)$ molecule.

The $J/ar{D}_{0}(2400)$ molecular state explains the $J/ ightarrow ext{}\omega$ enhancement.

Unified molecular framework accounts for multiple charmonium-like structures.

Abstract

Stimulated by the new evidence of Y(4274) observed in the $J/\psi\phi$ invariant mass spectrum, we first propose the charmonium-like state Y(4274) as the S-wave $D_s\bar{D}_{s0}(2317)+h.c.$ molecular state with $J^P=0^-$, which is supported well by dynamics study of the system composed of the pseudoscalar and scalar charmed mesons. The S-wave $D\bar{D}_{0}(2400)+h.c.$ molecular charmonium appears as the molecular partner of Y(4274), which is in accord with the enhancement structure appearing at 4.2 GeV in the $J/\psi\omega$ invariant mass spectrum from B decays. Our study shows that the enhancement structures, $i.e.$, the newly observed Y(4274) and the previously announced $Y(4140)/Y(3930)$ in the $J/\psi\phi$ and $J/\psi\omega$ invariant mass spectra, can be understood well under the uniform framework of the molecular charmonium, which can be tested by future experiments.