Relativistic two-body decay
= Relativistic two-body decay
{wiki}
For a rest-frame decay $1\to2+3$,
$$
E_2=\frac{m_1^2+m_2^2-m_3^2}{2m_1}c^2,
\qquad
E_3=\frac{m_1^2+m_3^2-m_2^2}{2m_1}c^2.
$$
The decay is allowed exactly when $m_1\geq m_2+m_3$.
= Relativistic two-body decay
{wiki}
For a rest-frame decay $1\to2+3$,
$$
E_2=\frac{m_1^2+m_2^2-m_3^2}{2m_1}c^2,
\qquad
E_3=\frac{m_1^2+m_3^2-m_2^2}{2m_1}c^2.
$$
The decay is allowed exactly when $m_1\geq m_2+m_3$.