Study of ${\chi }_{b1,2}(2P)\to \omega {\rm Y}(1S)$ transitions in ${\rm Y}(3S)\to \gamma {\chi }_{b1,2}(2P)$ decays at BaBar

Abstract

Results are presented on ${\chi }_{b1,2}(2P)\to \omega {\rm Y}(1S)$ transitions from $e^{+}{e}^{-}\to {\rm Y}(3S)\to \gamma {\chi }_{b1,2}(2P)$ decays. The data were collected with the BaBar detector at the PEP-II asymmetric-energy $e^{+}{e}^{-}$ collider at SLAC. The integrated luminosity of the data sample is 28.0 fb${}^{-1}$, corresponding to $121.3\times 10^6$ ${\rm Y}(3S)$ decays. Signals of ${\chi }_{b1,2}(2P)$ are observed over a negligible background. Improved precision measurements of branching fractions are obtained. First measurements of the ${\chi }_{b1,2}(2P)$ angular distributions are performed. No evidence is found for the presence of a ${\chi }_{b0}(2P)\to \omega {\rm Y}(1S)$ decay mode.

14 pages, 15 figures

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