1963 summer study report.

"AEC Contract AT(04-3)-476.""AEC Contract AT(04-3)-400.""SLAC Report No. 25.""Summer 1963."Cover title.Includes bibliographical references.Part 2. Authors include: L. Hand and R. WIson.Part 1. Authors include: K. Berkelman, G.R. Bishop, C. de Vries, G. Feldman, D.B. Isabelle, D.B. Lichtenberg, J. Mathews, J. Pine, R. Wilson.Mode of access: Internet

Radiative decays of the J/ψ\psi and evidence for a new heavy resonance

The three photon final state produced in e + e − collisions has been measured at the mass of the J ψ resonance using the nonmagnetic part of the double arm spectrometer DASP. The decays J ψ → ηγ, η'γ and π o γ were observed and their branching ratios are given. A four standard deviation signal was observed in the γγ mass spectrum at a mass of (2.83 ± 0.03) GeV. An upper limit is given for the direct decay J ψ → 3γ

The three photon final state produced in e+e−e^+ e^- collision at 3.6-GeV and at the ψ′\psi'

The three photon final state produced in e + e − collisions at 3.6 GeV and at the mass of the ψ′ resonance has been measured using the nonmagnetic part of the double arm spectrometer DASP. A total of 31 events is observed outside the resonance region compared to 35.1 events predicted from QED. At the mass of the ψ′ 49 events are observed compared to 37.2 events expected from QED. Limits on radiative decays via intermediate states are given

Study of hadronic final states from double tagged gammagammagammagamma events at LEP

The interaction of virtual photons is investigated using double tagged gammagamma events with hadronic final states recorded by the ALEPH experiment at e^+e^- centre-of-mass energies between 188 and 209 GeV. The measured cross section is compared to Monte Carlo models, and to next-to-leading-order QCD and BFKL calculations.The interaction of virtual photons is investigated using double tagged gammagamma events with hadronic final states recorded by the ALEPH experiment at e^+e^- centre-of-mass energies between 188 and 209 GeV. The measured cross section is compared to Monte Carlo models, and to next-to-leading-order QCD and BFKL calculations