2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/49555The quark spin and flavor structure of the nucleon is discussed in the SU(4) symmetry breaking chiral quark model. The spin and flavor contents for charm quarks and anti-charm quarks are predicted and compared with the results given by other models. The intrinsic charm quark contribution to the Ellis-Jaffe sum rule is discussed.10 pages, 3 tables and 1 figuresHigh Energy Physics - Phenomenologytext