DReaction_factory_p2pi0_hists.cc

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// $Id$
//
//    File: DReaction_factory_p2pi0_hists.cc
// Created: Tue May 19 07:56:15 EDT 2015
// Creator: jrsteven (on Linux ifarm1401 2.6.32-431.el6.x86_64 x86_64)
//


#include "DReaction_factory_p2pi0_hists.h"

//------------------
// init
//------------------
jerror_t DReaction_factory_p2pi0_hists::init(void)
{
   // Make as many DReaction objects as desired
   DReactionStep* locReactionStep = NULL;
   DReaction* locReaction = new DReaction("p2pi0_hists"); //needs to be a unique name for each DReaction object, CANNOT (!) be "Thrown"

   // DOCUMENTATION:
   // ANALYSIS library: https://halldweb1.jlab.org/wiki/index.php/GlueX_Analysis_Software
   // DReaction factory: https://halldweb1.jlab.org/wiki/index.php/Analysis_DReaction

   /**************************************************** p2pi0_hists Reaction Steps ****************************************************/

   //Required: DReactionSteps to specify the channel and decay chain you want to study
      //Particles are of type Particle_t, an enum defined in sim-recon/src/libraries/include/particleType.h

   // g, p -> pi0, pi0, p
   locReactionStep = new DReactionStep();
   locReactionStep->Set_InitialParticleID(Gamma);
   locReactionStep->Set_TargetParticleID(Proton);
   locReactionStep->Add_FinalParticleID(Pi0);
   locReactionStep->Add_FinalParticleID(Pi0);
   locReactionStep->Add_FinalParticleID(Proton);
   locReaction->Add_ReactionStep(locReactionStep);
   dReactionStepPool.push_back(locReactionStep); //register so will be deleted later: prevent memory leak

   // pi0 -> g, g
   locReactionStep = new DReactionStep();
   locReactionStep->Set_InitialParticleID(Pi0);
   locReactionStep->Add_FinalParticleID(Gamma);
   locReactionStep->Add_FinalParticleID(Gamma);
   locReactionStep->Set_KinFitConstrainInitMassFlag(false);
   locReaction->Add_ReactionStep(locReactionStep);
   dReactionStepPool.push_back(locReactionStep); //register so will be deleted later: prevent memory leak

   // pi0 -> g, g
   locReactionStep = new DReactionStep();
   locReactionStep->Set_InitialParticleID(Pi0);
   locReactionStep->Add_FinalParticleID(Gamma);
   locReactionStep->Add_FinalParticleID(Gamma);
   locReactionStep->Set_KinFitConstrainInitMassFlag(false);
   locReaction->Add_ReactionStep(locReactionStep);
   dReactionStepPool.push_back(locReactionStep); //register so will be deleted later: prevent memory leak

   /**************************************************** p2pi0_hists Control Settings ****************************************************/

   // Recommended: Type of kinematic fit to perform (default is d_NoFit)
      //fit types are of type DKinFitType, an enum defined in sim-recon/src/libraries/ANALYSIS/DKinFitResults.h
   locReaction->Set_KinFitType(d_P4AndVertexFit); //simultaneously constrain apply four-momentum conservation, invariant masses, and common-vertex constraints

   // Highly Recommended: When generating particle combinations, reject all beam photons that match to a different RF bunch (delta_t > 2.004 ns)
   locReaction->Set_NumPlusMinusRFBunches(0);

   /**************************************************** p2pi0_hists Analysis Actions ****************************************************/

   // Recommended: Analysis actions automatically performed by the DAnalysisResults factories to histogram useful quantities.
      //These actions are executed sequentially, and are executed on each surviving (non-cut) particle combination 
      //Pre-defined actions can be found in ANALYSIS/DHistogramActions.h and ANALYSIS/DCutActions.h

   // PID
   locReaction->Add_AnalysisAction(new DHistogramAction_PID(locReaction, false));
        locReaction->Add_AnalysisAction(new DCutAction_PIDDeltaT(locReaction, false, 1.0, Unknown, SYS_TOF)); //false: measured data //Unknown: All PIDs
        locReaction->Add_AnalysisAction(new DCutAction_PIDDeltaT(locReaction, false, 10.0, Unknown, SYS_BCAL)); //false: measured data //Unknown: All PIDs
        locReaction->Add_AnalysisAction(new DCutAction_PIDDeltaT(locReaction, false, 10.0, Unknown, SYS_FCAL)); //false: measured data //Unknown: All PIDs

        // Custom histograms for p2pi0 (no KinFit cut)
        locReaction->Add_AnalysisAction(new DHistogramAction_InvariantMass(locReaction, Pi0, false,500,0.,1., "NoKinFit_Measured"));
        locReaction->Add_AnalysisAction(new DCustomAction_p2pi0_hists(locReaction, false, "NoKinFit_Measured"));

   // Kinematics
   locReaction->Add_AnalysisAction(new DHistogramAction_ParticleComboKinematics(locReaction, false)); //false: fill histograms with measured particle data

   _data.push_back(locReaction); //Register the DReaction with the factory

   return NOERROR;
}

//------------------
// fini
//------------------
jerror_t DReaction_factory_p2pi0_hists::fini(void)
{
   for(size_t loc_i = 0; loc_i < dReactionStepPool.size(); ++loc_i)
      delete dReactionStepPool[loc_i]; //cleanup memory
   return NOERROR;
}