PYTHIA  8.303
Public Member Functions | List of all members
ResonanceDecays Class Reference

#include <ResonanceDecays.h>

Inheritance diagram for ResonanceDecays:
PhysicsBase

Public Member Functions

 ResonanceDecays ()
 Constructor.
 
void init ()
 Store pointers to Info and Rndm for error messages and random numbers.
 
bool next (Event &process, int iDecNow=0)
 Generate the next decay sequence. More...
 
- Public Member Functions inherited from PhysicsBase
void initInfoPtr (Info &infoPtrIn)
 This function is called from above for physics objects used in a run. More...
 
virtual ~PhysicsBase ()
 Empty virtual destructor.
 
bool flag (string key) const
 Shorthand to read settings values.
 
int mode (string key) const
 
double parm (string key) const
 
string word (string key) const
 

Additional Inherited Members

- Public Types inherited from PhysicsBase
enum  Status {
  INCOMPLETE = -1, COMPLETE = 0, CONSTRUCTOR_FAILED, INIT_FAILED,
  LHEF_END, LOWENERGY_FAILED, PROCESSLEVEL_FAILED, PROCESSLEVEL_USERVETO,
  MERGING_FAILED, PARTONLEVEL_FAILED, PARTONLEVEL_USERVETO, HADRONLEVEL_FAILED,
  CHECK_FAILED, OTHER_UNPHYSICAL, HEAVYION_FAILED
}
 Enumerate the different status codes the event generation can have.
 
- Protected Member Functions inherited from PhysicsBase
 PhysicsBase ()
 Default constructor.
 
virtual void onInitInfoPtr ()
 
virtual void onBeginEvent ()
 This function is called in the very beginning of each Pythia::next call.
 
virtual void onEndEvent (Status)
 
virtual void onStat ()
 This function is called from the Pythia::stat() call.
 
void registerSubObject (PhysicsBase &pb)
 Register a sub object that should have its information in sync with this.
 
- Protected Attributes inherited from PhysicsBase
InfoinfoPtr = {}
 
SettingssettingsPtr = {}
 Pointer to the settings database.
 
ParticleDataparticleDataPtr = {}
 Pointer to the particle data table.
 
HadronWidthshadronWidthsPtr = {}
 Pointer to the hadron widths data table.
 
RndmrndmPtr = {}
 Pointer to the random number generator.
 
CoupSMcoupSMPtr = {}
 Pointers to SM and SUSY couplings.
 
CoupSUSYcoupSUSYPtr = {}
 
BeamParticlebeamAPtr = {}
 
BeamParticlebeamBPtr = {}
 
BeamParticlebeamPomAPtr = {}
 
BeamParticlebeamPomBPtr = {}
 
BeamParticlebeamGamAPtr = {}
 
BeamParticlebeamGamBPtr = {}
 
BeamParticlebeamVMDAPtr = {}
 
BeamParticlebeamVMDBPtr = {}
 
PartonSystemspartonSystemsPtr = {}
 Pointer to information on subcollision parton locations.
 
SigmaTotalsigmaTotPtr = {}
 Pointer to the total/elastic/diffractive cross sections.
 
set< PhysicsBase * > subObjects
 
UserHooksPtr userHooksPtr
 

Detailed Description

The ResonanceDecays class handles the sequential decay of resonances that are part of the hard process (t, W, Z, H, SUSY,...).

Member Function Documentation

bool next ( Event process,
int  iDecNow = 0 
)

Generate the next decay sequence.

Loop over all entries to find resonances that should decay. (Except for iDecNow > 0, where only it will be handled.)

Fill the decaying particle in slot 0 of arrays.

Mother flavour - relevant for gamma*/Z0 mixing. (Not always??)

Prepare decay selection.

Pick a decay channel; allow up to ten tries.

Pick decay channel. Find multiplicity.

Read out flavours.

Pick masses. Pick new channel if fail.

Failed to find acceptable decays.

Select colours in decay.

Select four-momenta in decay, boosted to lab frame.

Append decay products to the process event record. Set lifetimes.

Set decay vertex when this is displaced.

Set lifetime of daughters.

Modify mother status and daughters.

End of loop over all entries.

Done.


The documentation for this class was generated from the following files: