Two-current correlations in the pion on the lattice

Understand

We perform a systematic study of the correlation functions of two quark currents in a pion using lattice QCD.

• We obtain good signals for all but one of the relevant Wick contractions of quark fields.
• We investigate the quark mass dependence of our results and test the importance of correlations between the quark and the antiquark in the pion.
• Our lattice data are compared with predictions from chiral perturbation theory.