PT Journal
AU Courtoy, A
   Noguera, S
   Scopetta, S
TI Two-current correlations in the pion in the Nambu and Jona-Lasinio model
SO European Physical Journal C
JI Eur. Phys. J. C
PY 2020
BP 909 - 11pp
VL 80
IS 10
DI 10.1140/epjc/s10052-020-08470-1
LA English
AB We present an analysis of two-current correlations for the pion in the Nambu-Jona-Lasinio model, with Pauli-Villars regularization. We provide explicit expressions in momentum space for two-current correlations corresponding to the zeroth component of the vector Dirac bilinear in the quark vertices, which has been evaluated on the lattice, thinking to applications in a high energy framework, as a step towards the calculation of pion double parton distributions. The numerical results show a remarkable qualitative agreement with recent lattice data. The factorization approximation into one-body currents is discussed based on previous evaluation of the relevant low energy matrix elements in the Nambu-Jona-Lasinio model, confirming the lattice result.
ER