http://www-com.physik.hu-berlin.de/~fjeger/gm2review.pdf

The muon g ― 2

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

Finite-width corrections based on a generalized effective range formula for pion-pion scattering modify by a non-negligible amount the well-known relation between $\ensuremath{\Gamma}(\ensuremath{\rho}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}})$ and $\ensuremath{\Gamma}(\ensuremath{\rho}\ensuremath{\rightarrow}\ensuremath{\pi}\ensuremath{\pi})$ derived on the basis of vector-meson dominance. We also present a new current-algebra prediction for the shape and magnitude of $\ensuremath{\sigma}({e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}})$ and estimate the $\ensuremath{\rho}$-meson contribution to the Schwinger term.

Finite-Width Corrections to the Vector-Meson-Dominance Prediction for ρ → e + e −

Assuming that leptons heavier than muons exist in nature, we consider their decay modes and the correlations between the decay products of ${l}^{+}$ and ${l}^{\ensuremath{-}}$ in the colliding-beam experiment: ${e}^{+}+{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{l}^{+}+{l}^{\ensuremath{-}}$. Far above the threshold, the helicities of ${l}^{+}$ and ${l}^{\ensuremath{-}}$ tend to be opposite to each other. Near the threshold the directions of spins of ${l}^{+}$ and ${l}^{\ensuremath{-}}$ prefer to be parallel to each other, and the sum of the two spins prefers to be either parallel or anti-parallel to the direction of the incident electron. Because the parity conservation is violated maximally in the decays of ${l}^{+}$ and ${l}^{\ensuremath{-}}$, the angular distributions of decay products depend strongly on the spin orientation of the heavy leptons. Since the spins of ${l}^{+}$ and ${l}^{\ensuremath{-}}$ are strongly correlated in the production, we found a strong correlation between the energy-angle distributions of the decay products of ${l}^{+}$ and ${l}^{\ensuremath{-}}$. The decay widths of ${l}^{\ensuremath{-}}$ into channels ${\ensuremath{\nu}}_{l}{\overline{\ensuremath{\nu}}}_{e}{e}^{\ensuremath{-}}$, ${\ensuremath{\nu}}_{l}{\overline{\ensuremath{\nu}}}_{\ensuremath{\mu}}{\ensuremath{\mu}}^{\ensuremath{-}}$, ${\ensuremath{\nu}}_{l}{\ensuremath{\pi}}^{\ensuremath{-}}$, ${\ensuremath{\nu}}_{l}{K}^{\ensuremath{-}}$, ${\ensuremath{\nu}}_{l}{\ensuremath{\rho}}^{\ensuremath{-}}$, ${\ensuremath{\nu}}_{l}{K}^{*}$, ${\ensuremath{\nu}}_{l}{A}_{1}$, ${\ensuremath{\nu}}_{l}Q$, and ${\ensuremath{\nu}}_{l}+\mathrm{hadron}$ continuum as functions of the mass of ${l}^{\ensuremath{-}}$ are estimated.

Decay Correlations of Heavy Leptons in e + + e − → l + + l −

Measurement of the e + e − → π + π − cross section between 600 and 900 MeV using initial state radiation

Study of electron-positron annihilation into π+π− on the ϱo resonance

Comparison of Orsay results on vector mesons with the vector meson dominance model predictions

STUDY OF ELECTRON-POSITRON ANNIHILATION INTO $pi$$sup +$$pi$$sup -$ AT 775 MeV WITH THE ORSAY STORAGE RING.

π+-π− production in e+e− collisions and ρ-ω interference

Study of the φ meson production with the Orsay electron-positron colliding beams

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