Analysis TTreeFormat

Why?

• With a standard TTree format can streamline (and provide a best-practices implementation of): analysis utilities, BDT setup/input, amplitude analysis setup/input(?)
• Makes it easy for users to keep everything organized, especially the combinatoric background information.
• Can be enabled/disabled with a single flag.
• Is extensible (customizable) at every level.

Summary

• DTreeParticle roughly mirrors DKinematicData
• DTreeStep roughly mirrors DParticleComboStep
• DTreeCombo roughly mirrors DParticleCombo, + detected particles not used in the combo
• DTreeEvent contains DTreeCombo's for each output DReaction, + thrown tracks

DTreeParticle

• Roughly mirrors DKinematicData
• p3, v3, and t are stored at both the start (production) and end points (decay, TOF/BCAL/FCAL hit) of the track.
  • This is primarily motivated by the Ξ^-, which is long-lived and whose trajectory is bent by the magnetic field before it decays.

class DTreeParticle : public TObject
{
  public:
    // PID:
    Particle_t dPID;
 
    // KINEMATICS:
      //If kinematic fit was performed, this is the kinematic fit results.  Else is measured results. 
    TVector3 dPosition_Start; //the position where the particle is produced
    double dTime_Start; //time of the track at dPosition_Start: if value is not kinfit, is projected from measured TOF/BCAL/FCAL time
    TVector3 dMomentum_Start; //momentum of the track at dPosition_Start
 
    TVector3 dPosition_End; //detected particles: the reconstructed position of the BCAL/FCAL/TOF hit; decaying particles: the point where it decays
    double dTime_End; //time of the track at dPosition_End
    TVector3 dMomentum_End; //momentum of the track at dPosition_End
 
    double dPathLength; //from dPosition_Start to dPosition_End
    TMatrixDSym dCovarianceMatrix; //at dPosition_Start // Order is (px, py, pz, x, y, z, t)
 
    // PID QUALITY:
    unsigned int dNDF_Tracking; //0 if neutral or decaying
    double dChiSq_Tracking; //NaN if neutral or decaying
    unsigned int dNDF_Timing; //0 if no TOF/BCAL/FCAL hit (e.g. slow protons)
    double dChiSq_Timing; //NaN if no TOF/BCAL/FCAL hit (e.g. slow protons)
    unsigned int dNDF_DCdEdx; //0 if neutral or decaying
    double dChiSq_DCdEdx; //NaN if neutral or decaying
 
    // DEPOSITED ENERGY:
      //0.0 if no hit
    double ddEdx_FDC;
    double ddEdx_CDC;
    double dEnergy_BCAL;
    double dEnergy_FCAL;
    double dEnergy_TOF;
 
    // DTREESTEP POINTERS:
    DTreeStep* dProductionStep; //the step object in which this DTreeParticle is produced (is a final-state particle)
    DTreeStep* dDecayStep; //the step object in which this DTreeParticle decays (is an initial-state particle) (will be null if not a decaying particle!)
 
    // CUSTOM VARIABLES:
    map<string, double> dCustomVariables; //key is unique string, double is value
    map<string, const TObject*> dCustomObjects; //key is unique string, TObject* is object
 
  ClassDef(DTreeParticle, 1)
};

DTreeStep

• Roughly mirrors DParticleComboStep

class DTreeStep : public TObject
{
  public:
    // INITIAL PARTICLES:
    const DTreeParticle* dInitialParticle; //if is null: decaying or beam particle not yet set!
    const DTreeParticle* dTargetParticle; //NULL for no target
 
    // FINAL PARTICLES:
    deque<DParticle_t> dFinalParticleIDs; //separate in case particle is NULL (e.g. decaying resonance)
    deque<const DTreeParticle*> dFinalParticles; //particle may be NULL if it is decaying or missing (especially if no kinematic fit was performed!!)
 
    // CUSTOM VARIABLES:
    map<string, double> dCustomVariables; //key is unique string, double is value
    map<string, const TObject*> dCustomObjects; //key is unique string, TObject* is object
 
  ClassDef(DTreeStep, 1)
};

DTreeCombo

* Roughly mirrors DParticleCombo
class DTreeCombo : public TObject
{
  public:
    // STEPS:
    deque<const DTreeStep*> dTreeSteps;
 
    // RF:
    bool dRFTimeMatchQuality; //true if good (certain), false if bad (not confident in value (e.g. no "good" tracks have TOF hits))
    double dRFTime;
    double dRFTimeUncertainty;
 
    // UNUSED PARTICLES:
    vector<const DTreeParticle*> dUnusedDetectedParticles;
    vector<const DTreeShower*> dUnusedDetectedShowers;
 
    // KINEMATIC FIT:
    DKinFitType dKinematicFitType; //Defined in DKinFitResults.h //d_NoFit if not performed
    double dChiSq_KinematicFit; //NaN if not performed
    unsigned int dNDF_KinematicFit; //0 if not performed
 
    // CUSTOM VARIABLES:
    map<string, double> dCustomVariables; //key is unique string, double is value
    map<string, const TObject*> dCustomObjects; //key is unique string, TObject* is object
 
  ClassDef(DTreeCombo, 1)
};

DTreeEvent

class DTreeEvent : public TObject
{
  public:
    // RUN, EVENT #'s:
    unsigned int locRunNumber;
    unsigned int locEventNumber;
 
    // DATA:
    map<string, deque<const DTreeCombo*> > dTreeCombos; //string key is (D)Reaction name, deque is the particle combos
    deque<const DTreeParticle*> dThrownParticles;
 
    // CUSTOM VARIABLES:
    map<string, double> dCustomVariables; //key is unique string, double is value
    map<string, const TObject*> dCustomObjects; //key is unique string, TObject* is object
 
  ClassDef(DTreeEvent, 1)
};