  The reduced matrix elements a_2 and d_2 are computed in lattice QCD with
N_f=2 flavors of light dynamical (sea) quarks. For proton and neutron targets
we obtain as our best estimates d_2^(p)=0.004(5) and d_2^(n)=-0.001(3),
respectively, in the MSbar scheme at Q^2=5 GeV^2, while for a_2 we find
a_2^(p)=0.077(12) and a_2^(n)=-0.005(5), where the errors are purely
statistical.
