Search for prompt production of pentaquarks in charm hadron final states

A search for hidden-charm pentaquark states decaying to a range of $Σ_{c}\bar{D}$ and $Λ_{c}\bar{D}$ final states, as well as doubly-charmed pentaquark states to $Σ_{c}D$ and $Λ_{c}^{+}D$, 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 $Λ_{c}^{+}$ baryon in the $Λ_{c}^{+}\to pK^{-}π^{+}$ decay mode. The known pentaquark states are also investigated, and their signal yields are found to be consistent with zero in all cases.