feynlag.pheno.kinematics.is_allowed¶

feynlag.pheno.kinematics.is_allowed(M_parent, m1, m2)[source]¶

Whether M_parent ≥ m1 + m2, when that is decidable.

Returns True/False for a decidable comparison and None when the masses are symbolic and the ordering is unknown — callers treat None as “keep the channel, numbers get substituted later”.