Some properties of the states at the hidden-strangeness mixed 12 ++ 12 - Heavy meson pair threshold in e+e- annihilation

The threshold behavior of e+e- annihilation is considered in the channels Bs0B-s∗+c.c., Bs1B-s+c.c., and Bs1B-s∗+c.c., where Bs0 and Bs1 are the excited bottom-strange JP=0+ and JP=1+ mesons. It is argued that due to the heavy quark spin symmetry only one coherent combination of the first two channels is produced in the S wave as well as the third channel. Thus, if there exist threshold molecular peaks in the considered channels, only two of such peaks can be formed in the annihilation. The properties of such threshold states are discussed, including the heavy-light spin structure and the related transitions to bottomonium plus light mesons, as well as mixing with the channels with and without hidden strangeness.