2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/206370Some very unusual features of the hadron structure functions, obtained in the generalized QCD sum rules, like the surprisingly strong difference between longitudinally and transversally polarized $ρ$ mesons structure functions and the strong suppression of the gluon sea in longitudinally polarized $ρ$ mesons are discussed. Also the problem of exact zero contribution of gluon condensates to pion and longitudinally polarized $ρ$ meson quark distributions is discussed.9 pages, 5 figsHigh Energy Physics - Phenomenologytext