The contribution of two-photon exchange in elastic lepton-proton scattering

Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow,

This choice of the incident energies assures that a two state approximation (only the two ground states of the colliding nuclei) and the method of perturbed

Résumé : Nous considérons un modèle que nous avons développé précédemment pour dé- crire les asymétries spin-spin dans la diffusion p-p à grands angles et nous l'ap- pliquons

In the framework of an impact picture model which gives a good description of the present unpolarized elastic p-p and pp experimental data at high energy, we intro- duce the

This is done by measuring the spin-correlation parameters A L L , *NN» *gg, and A L S in the Coulomb-interference region./3/ The measurments are analogous to those commonly

Later on, the Williams-Weizsacker approximation was also applied successfully to expe- riments involving (( pionic showers )) (i.. slightly different from ours ;

The average value hW γγ i of each bin corresponds to a weighted average according to a W γγ −12 distribution. The first uncertainty is statistical, the second systematic... The

Indeed, by measuring the axial profile of the ratio of the collection efficiencies detected by the confocal and non- descanned ports of a two-photon fluorescence scanning