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Belle II Software development
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Belle II Software development
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Class for the simulation of the eta' -> pi+ pi- eta and pi0 pi0 eta decays. More...
#include <EvtEtaPrimeDalitz.h>
Public Member Functions | |
| EvtEtaPrimeDalitz () | |
| Default constructor. | |
| virtual | ~EvtEtaPrimeDalitz () |
| Default destructor. | |
| std::string | getName () |
| Returns the model name: ETAPRIME_DALITZ. | |
| EvtDecayBase * | clone () |
| Returns a copy of the class object. | |
| void | init () |
| Checks that the number of input parameters are correct: | |
| void | initProbMax () |
| Sets the Maximum probability for the PHSP reweight. | |
| void | decay (EvtParticle *p) |
| Function that implements the energy-dependent Dalitz. | |
Class for the simulation of the eta' -> pi+ pi- eta and pi0 pi0 eta decays.
Please not that the order of the daugther particles matters! The eta must be the last one.
Evolution of the former EvtEtaDalitz, that implements a simpler Dalitz description with hard-coded parameters. The general structure of the class, as well as several methods, are inherited from it.
The chosen pametrization is based on a power expansion of the decay amplitude squared with real cefficients (see PDG 2015):
|M|^2 = 1 + a*Y + b*Y^2 + c*X + d*X^2,
where the kinematic variable X and Y are both linear combinations of the pions' and eta kinetic energies in the eta' frame.
The model takes 4 parameters corresponing to the six coeafficients a,b,c,d; c!=0 is indication of CP violation in eta decay, and it is therefore usually set to 0. An implementation of the model with the parameters measure by BESIII collab, Phys.Rev. D92 (2015) 012014 is:
ETAPRIME_DALITZ -0.047 -0.069 0.0 0.073;
The same coeafficients are used for eta' -> eta pi0 pi0
Definition at line 43 of file EvtEtaPrimeDalitz.h.
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1.9.6