Probing the quark condensate by means of pi-pi scattering

Details Probing the quark condensate by means of pi-pi scattering Probing the quark condensate by means of pi-pi scattering

1997-09-20

arxiv.org/abs/hep-ph/9709406v1

Nucl.Phys. A623 (1997) 169c-177c

Physics

High Energy Physics

High Energy Physics - Phenomenology

Scientific paper

10.1016/S0375-9474(97)00436-3

The available experimental information is consistent with the Weinberg predictions for the threshold parameters of pi-pi-scattering. The data, however, only test those relations that are insensitive to the quark masses m_u and m_d. 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 (Talk given at the DAFCE workshop, Frascati, November 1996).

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