2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/44963Using heavy quark symmetry we construct an energy sum rule relating the form factor of a heavy flavored meson $ξ(w)$ to the light quark energy distribution. We find that the current available data for $ξ(w)$ is consistent with a broad energy distribution rather than with that of a pure quark/anti-quark bound state, indicating a large nonvalence content.11 pages, REVTeX 3.0 file, (uuencoded postscript file of 1 figure appended)High Energy Physics - Phenomenologytext