QCD sum rules for the anticharmed pentaquark

We present a QCD sum rule analysis for the anticharmed pentaquark state with and without strangeness. While the sum rules for most of the currents are either nonconvergent or dominated by the DN continuum, the one for the nonstrange pentaquark current composed of two diquarks and an antiquark is convergent and has a structure consistent with a positive-parity pentaquark state after subtracting out the DN continuum contribution. Arguments are presented on the similarity between the result of the present analysis and that based on the constituent quark models, which predict a more stable pentaquark state when the antiquark is heavy.