2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/190539We explore the possibility that the excess neutral and charged current events seen by the H1 and ZEUS Collaborations at HERA at large x and Q^2 could arise from a hard charm component of the nucleon. While the symmetric intrinsic charm hypothesis is unable to account for the HERA anomaly, a non-symmetric charm distribution generated non-perturbatively, for which c-bar is much harder than c, can produce significant enhancement of cross sections at the HERA kinematics.extra figure included, version to appear in Phys. Lett. BHigh Energy Physics - PhenomenologyNuclear Theorytext