Observation Of The Lowest P-Wave Bbarb Bound-States

C Klopfenstein, Je Horstkotte,J Leefranzini,Rd Schamberger,M Sivertz,Lj Spencer,Pm Tuts,P Franzini,K Han,E Rice,D Son,S Youssef, T Zhao,Sw Herb,R Imlay,G Levman,W Metcalf,V Sreedhar,H Dietl,G Eigen, E Lorenz,G Mageras, F Pauss,H Vogel

PHYSICAL REVIEW LETTERS（1983）

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Abstract

In a continuing study of the spectroscopy of the bb-bar bound quark systems the discovery of the lowest P-wave bound states by observation of photons from the decays 2/sup 3/S/sub 1/(bb-bar)..--> gamma..+1/sup 3/P/sub J/(bb-bar) and 1/sup 3/P/sub j/(bb-bar)..--> gamma..+1/sup 3/S/sub 1/(bb-bar) is reported. The photons are observed as narrow enhancements in the inclusive photon spectrum from UPSILON' decays. The center of gravity of the /sup 3/P/sub J/ states (chi/sub b/), the fine-structure splitting, and the branching ratios for the two transitions are given.

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