This letter presents a novel analysis of the action/energy density
distribution around a static quark-antiquark pair in SU(3) lattice quantum
chromodynamics. Using the Fourier transformation of the link variable, we
remove the high-momentum gluon and extract the flux-tube component from the
action/energy density. When the high-momentum gluon is removed, the statistical
fluctuation is drastically suppressed, and the singularities from the quark
self-energy disappear. The obtained flux-tube component is broadly distributed
around the line connecting the quark and the antiquark.Comment: 12 page