| Description |
The talk will address the study of the first and second moments of the parton distribution functions, particularly those of the sea partons, inside a nucleon. This requires the computation of both the connected and disconnected insertions in Lattice QCD. This has been carried out on a $163 \times 24$ quenched lattice with Wilson fermion. The quark loops are calculated with $Z_2$ noise vectors. Unbiased subtractions and multiple nucleon sources have been used to reduce the statistical errors. We obtain 5 $\sigma$ signals for $\langle x \rangle$ for the u, d, and s quarks, but $\langle x2 \rangle$ is consistent with zero within errors.
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