Pi-Pi Scattering Lengths in the Light of Precision Measurements
2007
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.
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