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Probing the quark condensate by means of ππ scattering

✍ Scribed by H. Leutwyler

Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
537 KB
Volume
623
Category
Article
ISSN
0375-9474

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✦ Synopsis

The available experimental information is consistent with the Weinberg predictions for the threshold parameters of ~rlr-scattering. The data, however, only test those relations that are insensitive to the quark masses m,, and ma. Recent theoretical progress leads to remarkably sharp predictions for the behaviour of the S-and P-wave phase shifts in the elastic region -one of the very few low energy phenomena in QCD, where theory is ahead of experiment and where new precision data would subject the theory to a crucial test.

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