Analyzing ${\rm Y}(nS)$ decays acquired with the CLEO detector operating at the CESR $e^{+}{e}^{-}$ collider, we measure for the first time the product branching fractions $\mathcal{B}[{\rm Y}(nS)\to \gamma {\chi }_{bJ}((n-1)P)]\mathcal{B}[{\chi }_{bJ}(n-1)P)\to X_i]$ for $n=2$ and 3, where $X_i$ denotes, for each $i$, one of the 14 exclusive light-hadron final states for which we observe significant signals in both ${\chi }_{bJ}(1P)$ and ${\chi }_{bJ}(2P)$ decays. We also determine upper limits for the electric dipole (E1) transitions ${\rm Y}(3S)\to \gamma {\chi }_{bJ}(1P)$.

• Received 7 August 2008

DOI:https://doi.org/10.1103/PhysRevD.78.091103