Speaker
Description
We present the result of a study of the transitions $\chi_{b1,2}(2P)\to \omega\Upsilon(1{\mathrm{S}})$, with $\chi_b$ mesons produced in $e^+e^−\to \Upsilon(3S)\to\gamma\,\chi_{b1,2}(2P)$ reactions. The data were collected with the $BABAR$ detector at the PEP-II asymmetric-energy $e^+e^−$ collider, at the peak of the $\Upsilon(3S)$ resonance. The integrated luminosity of the data sample is 28.0 $fb^{−1}$, corresponding to $121.3\times 10^6$ $\Upsilon(3S)$ decays. Signals of $\chi_{b1,2}(2P)$ are observed over a negligible background. Improved precision measurements of branching fractions are obtained, and the first measurements of the angular distributions are performed. No evidence is found for the presence of a $\chi_{b0}(2P)\to \omega\Upsilon(1{\mathrm{S}})$ decay mode.
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