Partial waves in Bs∗ B s∗ production in e+e- annihilation near threshold

The production of the vector meson pairs Bs∗Bs∗ in the e+e- annihilation is generally contributed by two P wave amplitudes with different total spin S of the mesons, S=0 and S=2, and also by an F wave amplitude. Belle has recently reported a study of the available data at the energy of the ϒ(5S) peak in terms of the two P wave contributions only. It is argued here that, although at this energy the F wave should be quite suppressed, especially for the strange-bottom vector mesons, the particular studied angular distribution is very sensitive to a presence of even a small F wave amplitude due to a significant interference with the dominant S=2 P wave. Thus, the available data are not conclusive with regard to the partial wave structure of the production amplitude. Additional angular correlations that can be measured for a full amplitude analysis of the production process are discussed.