Recent observations of extragalactic neutrinos flow detected by IceCube differ from the theoretical predictions, as the number of events recorded in the detector is lower than expected by some theoretical models. This naturally raises the question, " What processes may be reducing the flow of extragalactic neutrinos coming to earth?" Since neutrinos are coupled with other matter only through the weak force, a possible interaction with the interstellar neutrino medium is not considered a likely source of the decreased flow of extragalactic neutrinos.

We discuss the dispersion of extragalactic neutrinos with three diferent flux of neutrinos in process mediated by the Z boson, and we show that en the standard model it is no possible that the flow of extragalactic neutrinos can be reduced due the interaction whith other neutrino fluxes.

Theory/Pheno