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16–21 Aug 2019
Guilin Bravo Hotel, Guilin, China
Asia/Shanghai timezone

Three pentaquark states or more?

18 Aug 2019, 17:00
20m
Golden Cassia (Guilin Bravo Hotel, Guilin, China)

Golden Cassia

Guilin Bravo Hotel, Guilin, China

14 South Ronghu Road, Xiangshan, Guilin 541002, Guangxi, China
Parallel Session 3: Exotic hadrons and candidates Session 3: Exotic hadrons and candidates

Speaker

Dr Chu-Wen Xiao (Central South University)

Description

The LHCb collaboration has reported recently three pentaquark states found in the $J/\psi N$ mass distribution. Based on the constraints of the heavy quark spin symmetry combined with the local hidden gauge symmetry, we investigate the ${\bar D}^{(*)}\Sigma_c^{(*)}$ interactions, together with $J/\psi N$ and other coupled channels, using a coupled channel approach. From the poles found in the second Riemann sheets, we dynamically reproduce the three states identified with the masses and the widths. Thus, we determine their quantum numbers and approximate molecular structure as $1/2^-$ $\bar{D} \Sigma_c$, $1/2^-$ $\bar{D}^* \Sigma_c$, and $3/2^-$ $\bar{D}^* \Sigma_c$, and isospin $I=1/2$. In our research procedure, we also predict some other states: (1) one $3/2^-$ $\bar{D} \Sigma_c^*$ state with the mass of around 4374 MeV, for which indications appear in the experimental spectrum; (2) two other near degenerate states of $1/2^-$ $\bar{D}^* \Sigma_c^*$ and $3/2^-$ $\bar{D}^* \Sigma_c^*$, found around 4520 MeV; (3) a $5/2^-$ $\bar D^* \Sigma_c^*$ state, appeared at the same energy. Our findings also serve as a guide for further experimental studies.

Primary author

Dr Chu-Wen Xiao (Central South University)

Co-authors

Prof. Eulogio Oset (IFIC, University of Valencia) Dr Juan Nieves (IFIC (CSIC-UV))

Presentation materials