Search for prompt production of pentaquarks in charm hadron final states

A search for hidden-charm pentaquark states decaying to a range of ΣcD̄ and ΛcD̄ final states, as well as doubly-charmed pentaquark states to ΣcD and Λc⁺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 √s = 13Te -0.1em V. Since no significant signals are found, upper limits are set on the pentaquark yields relative to that of the Λc⁺ baryon in the Λc⁺→ 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.