Reconciling the X(4630) with the Y(4660)
Feng-Kun Guo, Johann Haidenbauer, Christoph Hanhart, and Ulf-G., Mei{\ss}ner
TL;DR
This paper proposes that the X(4630) enhancement observed in Lambda_c^+ Lambda_c^- mass distribution can be explained as a molecular state related to the Y(4660), supported by final state interaction analysis and predictions for related states.
Contribution
It demonstrates the X(4630) as a molecular state consistent with the Y(4660) and predicts its spin partner, providing a unified molecular interpretation.
Findings
X(4630) can be explained as a psi'f_0(980) molecular state.
Predictions made for the eta_c'f_0(980) molecular partner.
High-statistics B decay measurements are recommended.
Abstract
The Belle Collaboration observed an enhancement called X(4630) in the Lambda_c^+ Lambda_c^- mass distribution using initial state radiation. We demonstrate that the enhancement could be consistent with the psi'f_0(980) molecular picture of the Y(4660) taking into account the Lambda_c^+ Lambda_c^- final state interaction. To test the hypothesis that the X(4630) and Y(4660) are the same molecular state, we give predictions for its spin partner, the eta_c'f_0(980) molecule. High statistic measurements of the B decays into the K Lambda_c^+ Lambda_c^- and K eta_c' pi^+ pi^- are strongly recommended.
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