Contribution of Zb resonances to (5S) →πππχb

We discuss the recently presented Belle results on the decays ?(5S)→πππχbJ(1P). The data indicate that in addition to the ω emission, ?(5S)→ωχbJ, there is a significant nonresonant background in the three pion spectrum. We suggest that a sizable fraction of this background may be associated with the cascade process ?(5S) →πZb→πρχb involving the Zb(10610) and Zb(10650) resonances. If confirmed by the data, this would be the first observation of transition from the Zb resonances to lower bottomonium with emission of a light meson state different from a single pion, which may provide a new input in understanding of the internal dynamics of these resonances.