Pentaquarks with hidden charm as hadroquarkonia

Understand

We consider hidden charm pentaquarks as hadroquarkonium states in a QCD inspired approach.

• Pentaquarks arise naturally as bound states of quarkonia excitations and ordinary baryons.
• The LHCb $P_c(4450)$ pentaquark is interpreted as a $\psi'$-nucleon bound state with spin-parity $J^P=3/2^-$.
• The partial decay width $\Gamma(P_c(4450)\to J/\psi+N)\approx 11$ MeV is calculated and turned out to be in agreement with the experimental data for $P_c(4450)$.