2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/41085The results of linear regresion of differential cross sections, $Σ$- and $T$-asymmetries of $η$-photoproduction on protons in energy region from threshold up to 1 GeV are presented. Serious contradictions between angular distributions measured in different laboratories are revealed. The energy dependance of regression coefficients may be due to transition from energy region of $S_{11}(1535)$ and $D_{13}(1520)$ to energy region of $D_{15}(1675)$ and $F_{15}(1680)$ resonances.4 pages, 3 figuresHigh Energy Physics - Phenomenologytext