The for the breakup momentum the daughter masses ma and mb are currently the nominal masses of the particles (FitParameters). Instead the invariant masses (arising from the 4 vectors) should be used. This does not affect decays into final state particles however it does affect decays into intermediate states!
For example:
The decay 1 -> 2 3 -> 345 (with 2 -> 45)
The breakup momentum for 1 -> 23 should be calculated with qSquared(invmass(p3+p4+p5) = S, invmass(p4+p5), invmass(p3))
The HelicityKinematics class with the Subsystems has to be reworked to large portions so that the FormFactors will receive the correct masses for their evaluation.
The for the breakup momentum the daughter masses
maandmbare currently the nominal masses of the particles (FitParameters). Instead the invariant masses (arising from the 4 vectors) should be used. This does not affect decays into final state particles however it does affect decays into intermediate states!For example: The decay 1 -> 2 3 -> 345 (with 2 -> 45) The breakup momentum for 1 -> 23 should be calculated with
qSquared(invmass(p3+p4+p5) = S, invmass(p4+p5), invmass(p3))The HelicityKinematics class with the Subsystems has to be reworked to large portions so that the FormFactors will receive the correct masses for their evaluation.
Estimated effort: 1-2w