Quantifying an "Off-axis" Neutrinos (probability and intensity) Considering the modelling of a high energy proton beam neutrino experiment. I have questions concerning the scattering of neutrinos from the axis of the proton beam. I understand that a muon beam (derived from a proton beam) incident on a target causes the muons to decay in part into (muon) neutrinos which are scattered from the initial axis of the muon and proton beams. I can quantify the energies of the muons and neutrinos with respect to the angle that they scatter in. 1) How might I go about quantifying the probability that neutrinos are scattered at a given angle from the incident axis? 2) How might I then go about quantifying the intensity of the scattered neutrinos at a given angle?