A new decay mode of higher charmonium

Abstract

We calculate the ${\Lambda }_c{\bar{\Lambda }}_c$ partial decay width of the excited vector charmonium states around 4.6 GeV with the quark pair creation model. We find that the partial decay width of the ${\Lambda }_c{\bar{\Lambda }}_c$ mode can reach up to several MeV for $\psi (4S,5S,6S)$. In contrast, the partial ${\Lambda }_c{\bar{\Lambda }}_c$ decay width of the states $\psi (3D,4D,5D)$ is less than one MeV. If the enhancement $Y(4630)$ reported by the Belle Collaboration in ${\Lambda }_c{\bar{\Lambda }}_c$ invariant-mass distribution is the same structure as $Y(4660)$, the $Y(4660)$ resonance is most likely to be a $S$-wave charmonium state.

arXiv comment8 pages, 4 figures

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Cited by in corpus (7)

• Pentaquark and Tetraquark states
• Strong decays of the $Y(4660)$ as a vector tetraquark state in solid quark-hadron duality
• A possible explanation of the threshold enhancement in the process $e^{+}{e}^{-}\to \Lambda \bar{\Lambda }$
• Possible ${\Lambda }_c{\bar{\Lambda }}_c$ molecular states and their productions in nulceon-antinulceon collision
• Three body open flavor decays of higher charmonium and bottomonium
• The new states $X(1910)$ and $X(2300)$ and higher light excited $J^{PC}=1^{+-}$ mesons
• Charmonium decays into ${\Lambda }_c{\bar{\Lambda }}_c$ pair governed by the hadronic loop mechanism