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This script tells you how the mass of a pair of particles varies with helicity angle, if you assign the wrong mass hypothesis to the two particles. The example shows how the \(\Lambda\to p\pi\) can fake a \(K^0_S\to\pi\pi\) decay at large values of helicity.

True decay
True parent mass:
First true daughter mass:
Second true daughter mass:
Reconstructed decay
First reconstructed daughter mass:
Second reconstructed daughter mass:
Momentum spectrum and unit settings
Lower momentum limit:
Upper momentum limit:
Number of points: