New Exotic Meson and Baryon Resonances from Doubly Heavy Hadronic Molecules

We predict several new exotic doubly heavy hadronic resonances, inferring from the observed exotic bottomoniumlike and charmoniumlike narrow states X (3872 ) , Z_b(10610 ), Z_b(10650 ), Z_c(3900 ), and Z_c(4020 /4025 ). We interpret the binding mechanism as mostly molecularlike isospin-exchange attraction between two heavy-light mesons in a relative S -wave state. We then generalize it to other systems containing two heavy hadrons which can couple through isospin exchange. The new predicted states include resonances in meson-meson, meson-baryon, baryon-baryon, and baryon-antibaryon channels. These include those giving rise to final states involving a heavy quark Q =c ,b and antiquark Q^{¯ '}=c ¯ ,b ¯ , namely, D D^{¯ *} , D^*D^{¯ *} , D^*B^*, B ¯B^*, B^¯*B^*, Σ_cD^¯*, Σ_cB^*, Σ_bD^¯*, Σ_bB^*, Σ_cΣ_¯c, Σ_cΛ_¯c, Σ_cΛ_¯b, Σ_bΣ_¯b, Σ_bΛ_¯b, and Σ_bΛ_¯c, as well as corresponding S -wave states giving rise to Q Q^' or Q ¯Q^¯'.