  We present a detailed study of the static and dynamic behavior of long
semiflexible polymer chains in a melt. Starting from previously obtained fully
equilibrated high molecular weight polymer melts [{\it Zhang et al.} ACS Macro
Lett. 3, 198 (2014)] we investigate their static and dynamic scaling behavior
as predicted by theory. We find that for semiflexible chains in a melt, results
of the mean square internal distance, the probability distributions of the
end-to-end distance, and the chain structure factor are well described by
theoretical predictions for ideal chains. We examine the motion of monomers and
chains by molecular dynamics simulations using the ESPResSo++ package. The
scaling predictions of the mean squared displacement of inner monomers, center
of mass, and relations between them based on the Rouse and the reptation theory
are verified, and related characteristic relaxation times are determined.
Finally we give evidence that the entanglement length $N_{e,PPA}$ as determined
by a primitive path analysis (PPA) predicts a plateau modulus,
$G_N^0=\frac{4}{5}(\rho k_BT/N_e)$, consistent with stresses obtained from the
Green-Kubo relation. These comprehensively characterized equilibrium
structures, which offer a good compromise between flexibility, small $N_e$,
computational efficiency, and small deviations from ideality provide ideal
starting states for future non-equilibrium studies.
