Two-current correlations in the pion in the Nambu and Jona-Lasinio model Aurore Courtoy, Santiago Noguera and Sergio Scopetta Eur. Phys. J. C, 80 10 (2020) 909 Published online: 01 October 2020 DOI: 10.1140/epjc/s10052-020-08470-1