Missing energy
= Missing energy
{title2=$E_{\rm miss}=E_{\rm initial}-\sum E_{\rm visible}$}
The <energy> component of the difference between the known initial <four-momentum> and the measured visible final <four-momenta>. In equal-beam <electron>-<Positron> collisions it is $\sqrt{s}-\sum_iE_i$ in <natural units>. It can arise from escaping <neutrinos>, but also from detector losses; it is distinct from the <missing invariant mass> and <missing transverse momentum>.