Pi-Pi Scattering Lengths in the Light of Precision Measurements
Abstract
Description
I summarize the history of theoretical predictions of, and experimental attempts to measure, pion-pion (S-wave) scattering lengths. Recent measurements at CERN confirm Weinberg's 1966 prediction of the I=2 scattering length and Basdevant and Lee's subsequent correction of the Weinberg I=0 value by inclusion of an S-wave I=0 resonance.
4 pages 1 figure; LaTeX. The .tar file contains 3 files: scl2.tex is the LaTeX file; scl2.pdf is the generated .pdf file, and scatlsC.ps is the figure file. Replacement contains scl3.tex scl3.ps and scatlsC.ps. Only change is Note added after posting to the arXiv, in acknowledgement section
4 pages 1 figure; LaTeX. The .tar file contains 3 files: scl2.tex is the LaTeX file; scl2.pdf is the generated .pdf file, and scatlsC.ps is the figure file. Replacement contains scl3.tex scl3.ps and scatlsC.ps. Only change is Note added after posting to the arXiv, in acknowledgement section