The LHCb pentaquark as a ${\bar{D}}^{\ast }{\Sigma }_c-{\bar{D}}^{\ast }{\Sigma }_c^{\ast }$ molecular state

L. Roca, J. Nieves, E. Oset

We perform a theoretical analysis of the ${\Lambda }_b\to J/\psi K^{-}p$ reaction from where a recent LHCb experiment extracts a $\Lambda (1405)$ contribution in the $K^{-}p$ spectrum close to threshol…