Amodel describing the fragmentation ofjets in had エonic interactions is here presented . The model is based on elastic quark scattering in a " dual − string " picture where the technics of tunneling is used to explain how the strings split up into fragments of jets . Vye derive an expression for the prebability of produci jets from scattering of quarks and discuss some of its implication on the jet − phenomena . 1Tunneling effects