Pion--Pion Scattering Experiments at Low Energy

Abstract

This work reviews the available experimental information on the pi-pi scattering lengths, especially the recent near-threshold pi N -> pi pi N data from several laboratories and the related application of the Chew-Low-Goebel (CLG) technique well below 1 GeV/c momentum. At this time uncertainties stemming from non-pion-exchange backgrounds in near-threshold CLG studies appear to preclude a determination of the pi$-pi scattering lengths with the desired accuracy of 10% or better.

Talk given by D. Pocanic at the International Workshop on "Hadronic Atoms and Positronium in the Standard Model", 26-31 May 1998, JINR (Dubna, Russia); 8 pages, 4 PostScript figures, writen in LaTeX, uses packages "dubna_98" and "psfig". Author's e-mail: pocanic@virginia.edu