2002/07/24 by D. Cinabro, Cinabro, D., CLEO Collaboration +1
Chemistry · Earth and Planetary Sciences · Physics and Astronomy · #Astronomy and Astrophysical Research #Atmospheric Ozone and Climate #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #Spectroscopy and Laser Applications #hep-ex
paper · pdf · doi:10.48550/arxiv.hep-ex/0207062
15 pages postscript, also available through http://w4.lns.cornell.edu/public/CLNS, ICHEP02
openalex publication_date 2002/07/24 · arxiv created 2002/08/29 · arxiv updated 2009/11/30 · openalex created_date 2024/04/10 · openalex updated_date 2026/07/28
We have studied two-photon transitions from Upsilon(3S) decays recorded by the CLEO-III detector in exclusive events with two photons and either two electrons or two muons. We obtain precision measurements of the chib(2PJ) masses for J=2 and J=1. The transition rates for all three spin states of the 2P triplet are measured with improved precision which leads to a better determination of their hadronic width ratios. We also observe rare transitions via the chib(1P) states. The measured rates for these transitions allow a determination of <1P|r|3S>, the E1 matrix element, which is more sensitive to the structure of the bb states than the <2P|r|3S> matrix element which dominates the radiative decays of the Upsilon(3S) state. We also present first upper limits on the branching ratios for Upsilon(3S)-> pi0 Upsilon(2S), Upsilon(3S) -> pi0 Upsilon(1S) and a new limit for the branching ratio for Upsilon(3S) -> eta Upsilon(1S).