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), Zb(10610), Zb(10650), Zc(3900), and Zc(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, DD¯∗, D∗D¯∗, D∗B∗, B¯B∗, B¯∗B∗, ΣcD¯∗, ΣcB∗, ΣbD¯∗, ΣbB∗, ΣcΣ¯c, ΣcΛ¯c, ΣcΛ¯b, ΣbΣ¯b, ΣbΛ¯b, and ΣbΛ¯c, as well as corresponding S-wave states giving rise to QQ′ or Q¯Q¯′.