Is it feasible to calculate a three-point correlation on the lattice? Say, I have two quark fields separated at z_1+z_2 and 0, and a gluon field inserted at z_2. Also I need two gauge links to make this expression gauge invariant:(adsbygoogle = window.adsbygoogle || []).push({});

\bar{\psi}(z_1+z_2) \Gamma(z_1+z_2; z_2) F^{\mu\nu}(z_2) \Gamma(z_2;0) \psi(0).

I have asked some lattice people and they told me that it's hard to do such a calculation. What do you guys think of this?

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# Can we calculate three-point correlation in lattice qcd

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