The differential cross section is defined as the number of events of a particular type p per unit of time, divided by the total flux F, where F is the number of particles crossing a unit of transverse area per unit of time.

For the process of elastic scattering sketched in figure MACRO-m3c-diff-F1, the differential cross section per unit solid angle is given by

Thus the differential cross section can be calculated if the deflection function is known.