Dalitzplot (H. van Hees & J. Knoll)

Equation for the boundary of 3-body phase-space in c.m. energies E1, E2:

Solution 1:

Solution 2:

Example: Decay of a particle with cm-energy 1 (i.e. s=1GeV) into 3 pions (m(pion)=0.14GeV)

Plot E2(E1) for the phase-space boundary:

Expressed in terms of invariant masses of the subclusters:
s12,s23,s13

Check:

The same Dalitz-plot as above in terms of invariant masses
Plot s23(s12) for the phase-space boundary: