2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/149341We investigate restrictions to be imposed over the non commutative geometry model C+M_2+M_3 to make it to fit with experimental data. By constraining the action over quarks, a leptophobic Z' is got6 pages LaTeX. Strog requisites removed, but also a claim derived from them is weakened. Original paper in available via http://dftuz.unizar.es/~rivero/9Z.gz at DFTUZHigh Energy Physics - Theorytext