QCD sum rules for D and B mesons in nuclear matter

QCD sum rules for D and B mesons embedded in cold nuclear matter are evaluated. We quantify the mass splitting of D-D and B-B mesons as a function of the nuclear matter density; extrapolated to saturation density it is in the order of 60 and 130 MeV, respectively, driven essentially by the condensates < q(dagger)q >, < q(dagger)g sigma Gq >, and < qq >. The poorly known condensate < q(dagger)g sigma Gq > may leave room for an even larger D-D mass splitting. The genuine chiral condensate < qq >, amplified by heavy-quark masses, enters the Borel transformed sum rules for the mass splitting beyond linear density dependence. The inclusion of strange quark condensates reveals a numerically smaller and opposite effect for the D-s-D-s mass splitting.