Molecular tetraquarks and pentaquarks in chiral effective field theory

Abstract

We studied the $D{\bar{D}}^{\ast }/\bar{D}{D}^{\ast }$, $D^{\ast }{\bar{D}}^{\ast }$, ${\bar{D}}_s{D}^{\ast }/{\bar{D}}_s^{\ast }D$, $B{\bar{B}}^{\ast }/\bar{B}{B}^{\ast }$ and $B^{\ast }{\bar{B}}^{\ast }$ di-hadron interactions in chiral effective field theory ($\chi$EFT) up to the next-to-leading (NLO) order. The above-threshold tetraquark states $Z_c(3900)$, $Z_c(4020)$, $Z_{cs}(3985)$, $Z_b(10610)$, $Z_b(10650)$ can be explained as the corresponding di-hadron resonances, respectively. We also studied the ${\Sigma }_c^{(\ast )}{\bar{D}}^{(\ast )}$ interactions to investigate the three hidden-charm pentaquarks $P_c(4312)$, $P_c(4440)$ and $P_c(4457)$. We further used the parameters fixed from the $P_c$ states to predict the possible molecular states in ${\Xi }_c{\bar{D}}^{(\ast )}$, ${\Xi }_c^{\prime }{\bar{D}}^{(\ast )}$ and ${\Xi }_c^{\ast }{\bar{D}}^{(\ast )}$ systems. Our predictions of the ${\Xi }_c{\bar{D}}^{(\ast )}$ bound states are very consistent with two new near-threshold structures recently observed by the LHCb Collaboration.

arXiv commentTalk presented at QCD22, 25th International Conference in QCD (4-7, July, 2022, Montpellier - FR). 4 pages, 5 figs, 1 table

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• Modern Theory of Nuclear Forces
• Chiral effective field theory and nuclear forces
• Hadronic molecules
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• The $XYZ$ states: experimental and theoretical status and perspectives
• Pentaquark and Tetraquark states
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• Observation of a charged charmoniumlike structure Z_c(4020) and search for the Z_c(3900) in e+e- to pi+pi-h_c
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• Study of e+e- => B(*) B(*)-bar pi+- at sqrt(s)=10.866 GeV
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Cited by in corpus (3)

• Chiral perturbation theory for heavy hadrons and chiral effective field theory for heavy hadronic molecules
• The ground states of hidden-charm tetraquarks and their radial excitations
• $D^{(\ast )}{\bar{B}}^{(\ast )}$ dynamics in chiral effective field theory