A search for hidden-charm pentaquark states decaying to a range of $\Sigma_{ c}\bar{ D}$ and $\Lambda_{ c}\bar{ D}$ final states, as well as doubly-charmed pentaquark states to $\Sigma_{ c}D$ and $\Lambda_{ c}^{ +}D$, is made using samples of proton-proton collision data corresponding to an integrated luminosity of $5.7fb^{ -1}$ recorded by the LHCb detector at $\sqrt{ s} = 13Te\kern -0.1em V$. Since no significant signals are found, upper limits are set on the pentaquark yields relative to that of the $\Lambda_{ c}^{ +}$ baryon in the $\Lambda_{ c}^{ +}\to pK^{ -}\pi^{ +}$ decay mode. The known pentaquark states are also investigated, and their signal yields are found to be consistent with zero in all cases.
Categories: hep-ex