Y(4143) is probably a molecular partner of Y(3930)

TL;DR

The paper suggests that Y(4143) is likely a D_s* D_s* molecular state with specific quantum numbers, and Y(3930) is its partner, both being narrow heavy molecular states observed in experiments.

Contribution

It proposes a molecular interpretation for Y(4143) and Y(3930), predicting their quantum numbers and decay modes, and connects experimental observations to these theoretical states.

Findings

Y(4143) is probably a D_s* D_s* molecular state.

Y(3930) is its D* D* molecular partner.

Both states have narrow widths due to decay mechanisms.

Abstract

After discussing the various possible interpretations of the Y(4143) signal observed by the CDF collaboration in the $J/\psi \phi$ mode, we tend to conclude that Y(4143) is probably a $D_s^\ast {\bar D}_s^\ast$ molecular state with $J^{PC}=0^{++}$ or $2^{++}$ while Y(3930) is its $D^\ast {\bar D}^\ast$ molecular partner as predicted in our previous work (arXiv:0808.0073). Both the hidden-charm and open charm two-body decays occur through the rescattering of the vector components within the molecular states while the three- and four-body open charm decay modes are forbidden kinematically. Hence their widths are narrow naturally. CDF, Babar and Belle collaborations may have discovered heavy molecular states already. We urge experimentalists to measure their quantum numbers and explore their radiative decay modes in the future.