Charmonium at CLEO

At CLEO, charmonium spectroscopy is pursued both thorugh e+e- annihilation data taken in the Upsilon region and more recently at psi(2S). A nmber of first observations (eta_c', h_c, pi and K form factors) have been made, and numerous high precision measurements have been made in radiative and hadronic decays of charmonium resonances. A brief report of these contributions is presented.Comment: 7 pages, 4 figures, plenary talk contributed to XI International Conference On Hadron Spectroscopy (HADRON05), 21-26 Aug 2005, Rio de Janeiro, Brazi

Exciting Developments in Hadron Spectroscopy

There has been a renaissance in hadron spectroscopy during the last couple of years. Long lost states have been tracked down. Unexpected states are showing up all over, and numerous measurements with unprecedented precision are being reported. A review is presented.Comment: 11 pages, 10 figures, plenary talk contributed to XI International Conference On Hadron Spectroscopy (HADRON05), 21-26 Aug 2005, Rio de Janeiro, Brazi

Hyperfine Interaction in Quarkonia

The recent experimental developments in the measurement of hyperfine splittings in the bound states of charmonium and bottomonium are presented. Their implications for the hyperfine interactions in the heavy quark systems are discussed.Comment: 7 pages, 7 figures, presented at 19th International IUPAP Conference on Few-Body Problems in Physics, Aug. 31 - Sept. 5, 2009, University of Bonn, German

Charmonium from CLEO

At CLEO, the charmonium singlet states eta_c(2 1S0) and h_c(1 1P1) have been firmly identified and a long standing discrepancy for Gamma_(gamma gamma)(chi_c2) has been resolved.Comment: 3 pages, 3 figures, contibuted to PANIC 200

Form factors of pions, kaons & protons at the highest timelike momentum transfers & first measurements of hyperons

Electromagnetic form factors of hadrons for timelike momentum transfers can be measured by particle-antiparticle annihilation into hadron-antihadron pairs. We have made the world’s first high precision measurements of timelike form factors of π and K mesons, and ground states of the baryons, protons, and the hyperons Λ0, Σ0, Σ+, Ξ0, Ξ–, Ω– at the high momentum transfers of 14.2 and 17.4 GeV2. Limitations of perturbative QCD are revealed, and evidence is presented for the effects of diquark correlations in Λ0 and Σ0