The physics of exotic hadrons is revisited and reviewed, with emphasis on flavour configurations which have not yet been investigated. The constituent quark model of multiquark states is discussed in some detail, as it can serve as a guide for more elaborate approaches.

Exotic Hadrons: Review and Perspectives

Exotic Hadrons from Heavy Ion Collisions

Inspired by the discovery of two pentaquarks $$P_{c}(4380)$$
 and $$P_{c}(4450)$$
 at the LHCb detector, we study possible hidden-charm molecular pentaquarks in the framework of quark delocalization color screening model. Our results suggest that both $$N\eta _{c}$$
 with $$\textit{IJ}^{P}=\frac{1}{2}\frac{1}{2}^{-}$$
 and $$\textit{NJ}/\psi $$
 with $$\textit{IJ}^{P}=\frac{1}{2}\frac{3}{2}^{-}$$
 are bounded by channels coupling. However, $$\textit{NJ}/\psi $$
 with $$\textit{IJ}^{P}=\frac{1}{2}\frac{3}{2}^{-}$$
 may be a resonance state in the D-wave $$N\eta _{c}$$
 scattering process. Moreover, $$P_{c}(4380)$$
 can be explained as the molecular pentaquark of $$\Sigma ^{*}_{c}D$$
 with quantum numbers $$\textit{IJ}^{P}=\frac{1}{2}\frac{3}{2}^{-}$$
 . The state $$\Sigma ^{*}_{c}D^{*}$$
 with $$\textit{IJ}^{P}=\frac{1}{2}\frac{5}{2}^{-}$$
 is a resonance, it may not be a good candidate of the observed $$P_{c}(4450)$$
 because of the opposite parity of the state to $$P_{c}(4380)$$
 , although the mass of the state is not far from the experimental value. In addition, the calculation is extended to the hidden-bottom pentaquarks, and similar properties to that of hidden-charm pentaquarks system are obtained.

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Possible pentaquarks with heavy quarks

On the history of dibaryons and their final observation

New data on quasifree polarized neutron-proton scattering in the region of the recently observed d* resonance structure are obtained by exclusive and kinematically complete high-statistics measurem ...

/pdf/neutron-proton-scattering-in-the-context-of-the-d-2380-2sfqz7ysuc.pdf

Neutron-proton scattering in the context of the d*(2380) resonance

Exclusive and kinematically complete high-statistics measurements of quasifree polarized (n) over right arrowp scattering have been performed in the energy region of the narrow resonancelike struct ...

Said Data Anal Ctr

Papers

Evidence for a New Resonance from Polarized Neutron-Proton Scattering