Neutrino-electron elastic scattering ($T_{\max }=2E_{\nu }^2/(m_e+2E_{\nu })$)

An elastic weak interaction of a neutrino with an electron. For a stationary electron of mass $m$ and an effectively massless incident neutrino of energy $E$, the maximum recoil kinetic energy in natural units is $T_{\max }=2E^2/(m+2E)$. This kinematic limit does not specify the interaction probability.