Study of χ b 1 , 2 ( 2 P ) → ω ϒ ( 1 S ) transitions in ϒ ( 3 S ) → γ χ b 1 , 2 ( 2 P ) decays at BABAR

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Open Access

26 March 2026

journal article
Published by American Physical Society (APS) in Physical Review D

Vol. 113 (5)
DOI:10.1103/sn5h-c2t9

Abstract

Results are presented on χ b 1 , 2 ( 2 P ) → ω ϒ ( 1 S ) transitions from e + e − → ϒ ( 3 S ) → γ χ b 1 , 2 ( 2 P ) decays. The data were collected with the 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 × 10 6 ϒ ( 3 S ) decays. Signals of χ b 1 , 2 ( 2 P ) are observed over a negligible background. Improved precision measurements of branching fractions are obtained. First measurements of the χ b 1 , 2 ( 2 P ) angular distributions are performed. No evidence is found for the presence of a χ b 0 ( 2 P ) → ω ϒ ( 1 S ) decay mode.

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Funding Information

University of Victoria
Institut National de Physique Nucléaire et de Physique des Particules
CERN
SLAC National Accelerator Laboratory
GridKA
CC

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