CLEO Results on Upsilons a

I present highlights of recent CLEO studies on the Υ(1S), Υ(2S), and Υ(3S). The preliminary results presented here include the first observation of a hadronic cascade in the Υ system not involving pions, Υ(3S) → γχ b1,2 (2P) followed by χ b1,2 (2P) → ωΥ(1S). I also present preliminary results on a search for inclusive ψ production in Υ(1S) decays. I end with a search for nine different two body hadronic decays of the Υ(nS), n = 1, 2, 3, resulting in the discovery of two such decays, and vastly improved upper limits on the branching ratios of the rest. During the year 2002, CLEO took data at the Υ(1S), Υ(2S) and Υ(3S), resulting in approximately 20 million hadronic events on the Υ(1S), 10 million hadronic events on the Υ(2S) and 5 million hadronic events on the Υ(3S). In addition to data taken on the peaks of each resonance, data were also taken below the resonances for background purposes and in scans across the resonances. The data used in the following studies were taken with the CLEO3 detector at the CESR e + e − storage ring. The detector includes a silicon microvertex detector and a drift chamber, as well as a crystal calorimeter and ring imaging cerenkov (RICH) detector for hadron ID. Muon chambers surround the detector. The tracking volume is in a uniform 1.5 T magnetic field. 2 What are Upsilons ? The Υ resonances are bound states of b and b quarks. The spectrum of bottomonium is very much like that seen in positronium. The Υ(4S) state is the source of B mesons at the B factories. The states in question in this talk are all below BB threshold. The Υ(nS) states are produced directly in e + e − collisions. The other bottomonia states are reached by cascades from these resonances. The relative rates of cascade decays are a particularly important testing ground for Lattice QCD-should these rates be accurately predicted, our overall confidence in the use of LQCD in other arenas will be bolstered. 3 Observation of χ b1,2 (2P) → ωΥ(1S) Up to now, the only transitions observed among bottomonia states have involved the emission of either photons or pion pairs. In this search 1 we looked for the transition sequence Υ(3S) →