$\pi$-$K$ scattering lengths at finite temperature in the Nambu--Jona-Lasinio model

P. Piwnicki, S. P. Klevansky, P. Rehberg

The transition amplitude for $\pi K$ scattering is evaluated within the SU(3) Nambu--Jona-Lasinio model. Ordering terms according to the expansion in $1/N_c$ leads to a box-like diagr…