1996/09/10 by Kuang-Ta Chao, Chao, Kuang-Ta
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/9609303
Talk presented at the 17th International Symposium on Lepton Photon Interactions, Beijing, China, Aug. 10-15, 1995
arxiv created 1996/09/10 · openalex publication_date 1996/09/10 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Recent results on physics in the charm energy region are reviewed. (1) The new data and puzzles in exclusive hadronic decays of J/ψ and ψ' give new challenges to the theory of hadronic decays. (2) With the new observation for ξ(2230) and f0(1500) in J/ψ radiative decays and other experiments, the situation in searching for glueballs is encouraging, but theoretical uncertainties related to the properties of glueballs still remain and need to be further reduced. (3) For the prompt production of charmonium at large transverse momentum, gluon and quark fragmentations dominate over leading-order parton fusions. Color-singlet fragmentation is not the dominant mechanism for J/ψ and ψ' production. Color-octet fragmentation seems to be important to explain the J/ψ and, in particular, the ψ' excess, but further tests are required. The mechanism of charmonium production at fixed-target also needs studying. (4) Some theoretical and experimental results in charmonium and open charm hadrons are also reported.