Antiproton production in cosmic rays: A comparison of photino and quark models

Abstract

The rise of energy of a pp interaction is accompanied by increase in multiplicity with corresponding rise in fraction of secondary particles produced in propagation of cosmic rays through the interstellar medium. A comparison of the energy dependence of the antiproton production is made in models of pp interaction including the quark qluon model, and models with super symmetric particle production and decay like those of decays of photinos. In the latter type of models the suppression of antiproton production above a certain critical energy results, whereas in the former type of models a rise in production rate of antiprotons above a threshold is the outcome.