π- π Scattering Lengths and Chiral Condensate in NJL Model

الأصل · EN

Within the general framework of SU(2) Nambu-Jona-Lasinio model beyond mean-field approximation, the S-wave π- π scattering lengths a₀⁰ and a₀² are calculated. The numerical results are in agreement with that analyzed from recent experiment πN → ππN data by using Chew-Low-Goebel technique, and the corresponding chiral condensate < qq> is around -(250 MeV)³, which is close to the ones obtained from lattice and sum rules.