Results are presented on χb1,2(2P) → χΥ(1S) transitions from e+e- → Υ(3S) → γχb1,2(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 × 106 Υ(3S) decays. Signals of χb1,2(2P) are observed over a negligible background. Improved precision measurements of branching fractions are obtained. First measurements of the χb1,2(2P) angular distributions are performed. No evidence is found for the presence of χb0(2P) → ωΥ(1S) decay mode.
Study of χ _{b1,2}(2P) → ωϒ(1S) transitions in ϒ(3S) → γχ_{b1,2}(2P) decays at BABAR
Gaz, A.;Margoni, M.;Simi, G.;Simonetto, F.;Stroili, R.;
2026
Abstract
Results are presented on χb1,2(2P) → χΥ(1S) transitions from e+e- → Υ(3S) → γχb1,2(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 × 106 Υ(3S) decays. Signals of χb1,2(2P) are observed over a negligible background. Improved precision measurements of branching fractions are obtained. First measurements of the χb1,2(2P) angular distributions are performed. No evidence is found for the presence of χb0(2P) → ωΥ(1S) decay mode.File in questo prodotto:
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