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The structure of pentaquarks $P_c^+$ in the chiral quark model · Around

2015

The structure of pentaquarks $P_c^+$ in the chiral quark model

Yang, Gang, Ping, Jialun

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The recent experimental results of LHCb collaboration suggested the existence of pentaquark states with charmonium.

To understand the structure of the states, a dynamical calculation of 5-quark systems with quantum numbers $IJ^P=\frac{1}{2}(\frac{1}{2})^\pm$, $\frac{1}{2}(\frac{3}{2})^\pm$ and $\frac{1}{2}(\frac{5}{2})^\pm$ is performed in the framework of chiral quark model with the help of gaussian expansion method.
The results show that the negative parity states can be bound states while all of the positive parity states are the scattering states.
The $P_c(4380)$ state is suggested to be the bound state of $\Sigma^*_cD$.

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Z. C. Yang, Z. F. Sun, J. He, X. Liu and S. L. Zhu, Chin. Phys. C 36
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