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Belle II Software
release-08-02-04
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Belle II Software
release-08-02-04
|
Class for the simulation of the eta -> pi+pi-pi0 decay with an improved dalitz description. More...
#include <EvtEtaFullDalitz.h>
Public Member Functions | |
| EvtEtaFullDalitz () | |
| Default Constructor. | |
| virtual | ~EvtEtaFullDalitz () |
| Default Destructor. | |
| std::string | getName () |
| Returns the model name: ETA_FULLDALITZ. | |
| EvtDecayBase * | clone () |
| Makes a copy of the pointer to the class. | |
| void | init () |
| Checks that the number of input parameters are correct: More... | |
| void | initProbMax () |
| Sets the Maximum probability for the PHSP reweight. More... | |
| void | decay (EvtParticle *p) |
| Function that implements the energy-dependent Dalitz. | |
Class for the simulation of the eta -> pi+pi-pi0 decay with an improved dalitz description.
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 + e*X*Y + f*Y^3,
where the kinematic variable X and Y are both linear combinations of the pions' kinetic energies in the eta frame.
The model takes 6 parameters corresponing to the six coeafficients a,b,c,d,e,f; c!=0 or e=0 are indication of CP violation in eta decay, and are therefore usually set to 0. An implementation of the model with the parameters report in Phys.Rev. D92 (2015) 012014 is:
ETA_FULLDALITZ -1.128 0.153 0.0 0.085 0.0 0.173;
In principle the class could be used also to model eta' -> pi+pi-pi0
Definition at line 41 of file EvtEtaFullDalitz.h.
1.9.1