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), Z₁ (10610), Z₁ (10650), Z₂ (3900), and Z₂ (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 Qover ¯^'=cover ¯, bover ¯, namely, DDover ¯^*, D^*Dover ¯^*, D^*B^*, Bover ¯B^*, Bover ¯^*B^*, Σ₂Dover ¯^*, Σ₂B^*, Σ₁Dover ¯^*, Σ₁B^*, Σ₂Σover ¯₂, Σ₂Λover ¯₂, Σ₂Λover ¯₁, Σ₁Σover ¯₁, Σ₁Λover ¯₁, and Σ₁Λover ¯₂, as well as corresponding S-wave states giving rise to QQ^' or Qover ¯Qover ¯^'.