Reconciling the X(4630) with the Y(4660)

Christoph Hanhart; Feng-Kun Guo; Johann Haidenbauer; Ulf-G. Mei{\ss}ner

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arxiv 1005.2055 v1 pith:CG5HLSIL submitted 2010-05-12 hep-ph

Reconciling the X(4630) with the Y(4660)

Feng-Kun Guo , Johann Haidenbauer , Christoph Hanhart , Ulf-G. Mei{\ss}ner This is my paper

classification hep-ph

keywords lambdastateenhancementmolecularaccountbellecalledcollaboration

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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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Does $\psi(4660)$ exist?
hep-ph 2026-05 unverdicted novelty 4.0

Fits using coupled channels and bare states show the psi(4660) as a conventional charmonium state above the Lambda_c pair threshold in both Belle and BESIII datasets.