Coupled channel analysis of molecule picture of Pc(4380)

We construct a potential obtained by one-pion exchange for the coupled channel Sigma(c)*(D) over bar-Sigma(c)(D) over bar* and solve the coupled Schrodinger equations to determine the binding energy. We find that there exists one or two bound states with the binding energy of several MeV below the threshold of Sigma(c)* and (D) over bar, dominantly made from a Sigma(c)* baryon and a (D) over bar meson, with the size of about 1.5 fm for a wide parameter region. We also study the pentaquark states including a b quark and/or an anti-b quark. We show that there exist pentaquarks including c (b) over bar, b (c) over bar, and b (b) over bar, all of which lie at about 10 MeV below the corresponding threshold and have size of about 1.5 fm.