# The 12th International Workshop on the Physics of Excited Nucleons

10-14 June 2019
Bonn, Campus Poppelsdorf
Europe/Zurich timezone

## Exotic Nstar: from light quarks to Charm and Beauty

13 Jun 2019, 17:30
30m
HS 7 ()

### HS 7

Baryon resonances in experiments with hadron beams and in the e+e- collisions

Xu Cao

### Description

We explore the photo-production of possible exotic $N^*$, which are narrow pentaquark candidates containing light quarks or Charm or Beauty. The latter two are also known as $P_c$ and $P_b$ states in literatures. We analyzed the Compton scattering off the proton in the third resonance region in a coupled-channel effective Lagrangian model with K-matrix approximation. The evidence of exotic $N^*$ with light quarks are found to be weak at present. Motivated by the $P_c$ observed by LHCb, we discussed the possible signal of $P_c$ and $P_b$ states in $\gamma p \to J/\psi p$ and $\gamma p \to \Upsilon p$, respectively at an Electron-Ion Collider (EIC) in order to disentangle the nature of these states.