Invisible Quark can be found in neutron (u, d, d, i). As we said it is undetectable and that is why it has not been revealed in neutron yet. Proton is Invisible Quark free (u, u, d). Invisible Quark can explain mass of W and Z gauge bosons and make Higgs, W and Z bosons obsolete.
Invisible Quark can be revealed using new visual theoretical model which we introduce here too. This model is consistent with Standard model. It not only predicts Invisible Quark but it also explains allowed charge combinations, color confinement and visual structure of composite particles including exotic mesons. It is based on Dirac sea idea materialized into new spacetime dimension so called Charge Dimension.
Visual model introductory video can be found here:
