Hidden and doubly heavy molecular states from interactions $$D^{(*)}_{(s)}{{\bar{D}}}^{(*)}_{s}$$/$$B^{(*)}_{(s)}{{\bar{B}}}^{(*)}_{s}$$ and $${D}^{(*)}_{(s)}D_{s}^{(*)}$$/$${B}^{(*)}_{(s)}B_{s}^{(*)}$$

Abstract In this work, we perform a systematical investigation about the possible hidden and doubly heavy molecular states with open strangeness from interactions of $$D^{(*)}{{\bar{D}}}^{(*)}_{s}$$ D ( ∗ ) ¯ s / $$B^{(*)}{{\bar{B}}}^{(*)}_{s}$$ B , $${D}^{(*)}_{s}{{\bar{D}}}^{(*)}_{s}$$ $${{B}}^{(*)}_{s}{{\bar{B}}}^{(*)}_{s}$$ $${D}^{(*)}D_{s}^{(*)}$$ $${B}^{(*)}B_{s}^{(*)}$$ $$D_{s}^{(*)}D_{s}^{(*)}$$ $$B_{s}^{(*)}B_{s}^{(*)}$$ in quasipotential Bethe-Salpeter equation approach. The systems considered are described within one-boson-exchange model, which includes exchanges light mesons $$J/\psi /\varUpsilon $$ J / ψ Υ meson. Possible searched for as poles scattering amplitudes considered. results suggest that recently observed $$Z_{cs}(3985)$$ Z cs 3985 can be assigned state $$D^*{\bar{D}}_s+D{\bar{D}}^*_s$$ + is partner $$Z_c(3900)$$ c 3900 $$D{\bar{D}}^*$$ state. calculation also favors existence $$D_s{\bar{D}}_s/B_s{\bar{B}}_s$$ spin parity $$J^P=0^+$$ P = 0 $$D_s{\bar{D}}^*_s/B_s{\bar{B}}^*_s$$ $$1^{+}$$ 1 $$D^*_s{\bar{D}}^*_s/B^*_s{\bar{B}}^*_s$$ $$0^+$$ $$1^+$$ $$2^+$$ 2 . sector, bound found $$(D^*D_s+DD^*_s)/(B^*B_s+BB^*_s)$$ $$D_s{\bar{D}}_s^*/B_s{\bar{B}}_s^*$$ $$D^*D^*_s/B^*B^*_s$$ $$D^*_sD^*_s/B^*_sB^*_s$$ Some other attractive, but may not strong enough to produce work helpful understanding future experimental search new states.