= Uniform three-body Dalitz density
{title2=$d\Phi_3=ds_{13}ds_{23}/(128\pi^3M^2)$}
After integrating the <Rotation>[overall orientation] of a scalar-parent <Relativistic three-body decay>[three-body decay], the <Lorentz-invariant phase space> is constant in two pairwise squared <invariant masses>. The two-body <factorization> $d\Phi_3=ds\,d\Phi_2(M;\sqrt s,m_2)d\Phi_2(\sqrt s;m_1,m_3)/(2\pi)$ and the relative-angle <Jacobian determinant>[Jacobian] give the displayed density. The event density includes $|\mathcal M|^2/(2M)$ and need not be flat: a <resonance> produces bands. Identical-particle counting supplies its usual global <symmetry factor>.
Back to article page
