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Parton physics on a lattice in the Bjorken frame
The parton physics related to correlations of quarks and gluons on the light-cone can be studied through the matrix elements of pure spatial correlators in the Bjorken frame. This observation allows practical calculations of parton properties on a Euclidean lattice. This includes Feynman parton distributions, generalized parton distributions, transverse-momentum-dependent distributions, as well as more generally, light-cone wave functions. It also allows one to understand the physics of gluon polarization in a polarized proton.