Double parton distributions in the nucleon from lattice QCD

A bstract We evaluate nucleon four-point functions in the framework of lattice QCD order to extract first Mellin moment double parton distributions (DPDs) unpolarized proton. In this study, we employ an n f = 2+1 ensemble with pseudoscalar masses m π 355 MeV and K 441 MeV. The results are converted scale μ 2 GeV. Our calculation includes all Wick contractions, for almost them a good statistical signal is obtained. analyze dependence DPD moments on quark flavor polarization. Furthermore, validity frequently used factorization assumptions investigated.