2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/188383The measurements of inclusive charm and beauty cross sections in deep-inelastic scattering $ep$ collisions at HERA are compared with the predictions of perturbative quantum chromodynamics from the CTEQ and MRST fitting groups, employing a range of theoretical schemes. The differences in the theoretical predictions are discussed and the theoretical uncertainties investigated.18 pages, 5 figures Submitted to Journal of Physics G:Nuclear and Particle PhysicsHigh Energy Physics - Phenomenologytext