High-energy photon interactions are discussed in terms of the hadronic structure of the photon, which is expressed by means of a formulation which is akin to, but somewhat more general than, vector-meson-dominance or specific generalized vector-dominance models. Experiments which demonstrate and yield information about this hadronic structure are discussed critically, and the resulting information is carefully evaluated. Special attention is paid to diffractive processes such as the photoproduction of vector mesons and to photon shadowing effects on nuclei. Relationships to other views of photon interactions, such as the parton model and the space-time description, are also discussed; these views are seen to complement the hadronic structure picture rather than to be in conflict. The general overview is that there is ample evidence which shows that the photon's hadronic structure plays a significant role in its interactions. What further work would most significantly enhance the understanding of the hadronic structure of the photon is also pointed out.

The Hadronic Properties of the Photon in High-Energy Interactions

Evidence is presented, from a study of multihadronic final states produced in e/sup +/e/sup -/ annihilation at center-of-mass energies between 3.90 and 4.60 GeV, for the production of a new neutral state with mass 1865 +- 15 MeV/c/sup 2/ and decay width less than 40 MeV/c/sup 2/ that decays to K/sup plus-or-minus/..pi../sup plus-or-minus/ and K/sup plus-or-minus/..pi../sup plus-or-minus/..pi../sup plus-or-minus/..pi../sup plus-or-minus/. The recoil-mass spectrum for this state suggests that it is produced only in association with systems of comparable or larger mass. (AIP)

/pdf/observation-in-e-e-annihilation-of-a-narrow-state-at-1865-47sb2sa5f0.pdf

Observation in e+e- annihilation of a narrow state at 1865 MeV/c2 decaying to Kπ and Kπππ

Measurements of multihadron production in e+e− annihilation at center-of-mass energies between 2.6 and 7.8 GeV are presented. Aside from the narrow resonances ψ(3095) and ψ(3684), the total hadronic cross section is found to be approximately 2.7 times the cross section for the production of muon pairs at c.m. energies below 3.7 GeV and 4.3 times the muon-pair cross section at c.m. energies above 5.5 GeV. Complicated structure is found at intermediate energies. Charged-particle multiplicities and inclusive momentum distributions are presented.

/pdf/hadron-production-by-e-e-annihilation-at-center-of-mass-5g05u9df5m.pdf

Hadron production by e+e- annihilation at center-of-mass energies between 2.6 and 7.8 GeV. I. Total cross section, multiplicities, and inclusive momentum distributions

We present experimental evidence for the existence of the decay psi (3684) $Yields$$gamma$,chi, chi$Yields$4$pi$/sup plus-or-minus/, 6$pi$/sup plus- or-minus/, $pi$$sup +$$pi$$sup -$K$sup +$K$sup -$, $pi$$sup +$$pi$$sup -$, and K$sup +$K$sup -$. There is clear evidence for at least two chi states, one at 3.41plus-or-minus0.001 GeV/c$sup 2$ and the other at 3.53plus-or-minus0.02 GeV/ c$sup 2$. The chi (3410) decays into $pi$$pi$ and KK and thus must have even spin and parity.

/pdf/ps-3684-radiative-decays-to-high-mass-states-sh38bkeuyt.pdf

ψ(3684) Radiative Decays to High-Mass States

Radiative decays of the Jψ and evidence for a new heavy resonance

Cross sections for e$sup +$e$sup -$$Yields$hadrons, e$sup +$e$sup -$, and $mu$$sup +$$mu$$sup -$ near 3684 MeV are presented The psi(3684) resonance is established as having the assignment J/sup PC/=1$sup --$ The mass is 3684+-5 MeV The partial width for decay to electrons is GAMMA/sube/=21+-03 keV and the total width is GAMMA=228+-56 keV (AIP)

/pdf/quantum-numbers-and-decay-widths-of-the-ps-3095-44hntlzhcu.pdf

Quantum numbers and decay widths of the ψ(3095)

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Quantum numbers and decay widths of the ψ(3095)