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We present results on the quark unpolarized, helicity and transversity partondistributions functions of the nucleon. We use the quasi-parton distributionapproach within the lattice QCD framework and perform the computation using anensemble of twisted mass fermions with the strange and charm quark masses tunedto approximately their physical values and light quark masses giving pion massof 260 MeV. We use hierarchical probing to evaluate the disconnected quarkloops. We discuss identification of ground state dominance, the Fouriertransform procedure and convergence with the momentum boost. We find non-zeroresults for the disconnected isoscalar and strange quark distributions. Thedetermination of the quark parton distribution and in particular the strangequark contributions that are poorly known provide valuable input to thestructure of the nucleon.

Flavor decomposition of the nucleon unpolarized, helicity and transversity parton distribution functions from lattice QCD simulations