DCustomAction_ppi0gamma_hists.cc

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// $Id$
//
//    File: DCustomAction_ppi0gamma_hists.cc
// Created: Wed Jan 21 16:53:41 EST 2015
// Creator: jrsteven (on Linux ifarm1401 2.6.32-431.el6.x86_64 x86_64)
//

#include "DCustomAction_ppi0gamma_hists.h"

void DCustomAction_ppi0gamma_hists::Initialize(JEventLoop* locEventLoop)
{
   //CREATE THE HISTOGRAMS
   //Since we are creating histograms, the contents of gDirectory will be modified: must use JANA-wide ROOT lock
   japp->RootWriteLock(); //ACQUIRE ROOT LOCK!!
   {
      //Required: Create a folder in the ROOT output file that will contain all of the output ROOT objects (if any) for this action.
         //If another thread has already created the folder, it just changes to it. 
      CreateAndChangeTo_ActionDirectory();

      dEgamma = GetOrCreate_Histogram<TH1I>("Egamma", "TAGGER photon energy; E_{#gamma}", 400, 0., 12.);
      
      dMM2_M3pi = GetOrCreate_Histogram<TH2I>("MM2_M3pi", "MM^{2} off #pi^{+}#pi^{-}#pi^{0} vs M_{#pi^{+}#pi^{-}#pi^{0}}; M_{#pi^{+}#pi^{-}#pi^{0}}; MM^{2}", 200, 0.0, 2.0, 200, -1., 1.);
      dProton_dEdx_P = GetOrCreate_Histogram<TH2I>("Proton_dEdx_P","dE/dx vs p; p; dE/dx",200,0,2,500,0,5);
      dProton_P_Theta = GetOrCreate_Histogram<TH2I>("Proton_P_Theta","p vs #theta; #theta; p (GeV/c)",180,0,180,120,0,12);
      
      dDeltaE_M3pi = GetOrCreate_Histogram<TH2I>("dDeltaE_M3pi", "#Delta E vs M_{#pi^{+}#pi^{-}#pi^{0}}; M_{#pi^{+}#pi^{-}#pi^{0}}; #Delta E (tagger - tracks)", 200, 0.0, 2.0, 200, -5., 5.);
      dPhi3pi_PhiP = GetOrCreate_Histogram<TH2I>("Phi3pi_PhiP", "#phi_{#pi^{+}#pi^{-}#pi^{0}} vs. #phi_{p}; #phi_{p}; #phi_{#pi^{+}#pi^{-}#pi^{0}}", 360, -180.0, 180.0, 360, -180., 180.);
      dDeltaPhi_M3pi = GetOrCreate_Histogram<TH2I>("DeltaPhi_M3pi", "#Delta#phi vs M_{#pi^{+}#pi^{-}#pi^{0}}; M_{#pi^{+}#pi^{-}#pi^{0}}; #Delta#phi", 200, 0.0, 2.0, 360, 0.0, 360.0);
      
      dEgamma_M3pi_ProtonTag = GetOrCreate_Histogram<TH2I>("dEgamma_M3pi_ProtonTag", "E_{#gamma} vs M_{#pi^{+}#pi^{-}#pi^{0}}; M_{#pi^{+}#pi^{-}#pi^{0}}; E_{#gamma}", 200, 0.0, 2.0, 240, 0., 6.);
      
      dMM2_M3pi_CoplanarTag = GetOrCreate_Histogram<TH2I>("MM2_M3pi_CoplanarTag", "MM^{2} off p #pi^{+}#pi^{-}#pi^{0} vs M_{#pi^{+}#pi^{-}#pi^{0}}: Coplanar Tag; M_{#pi^{+}#pi^{-}#pi^{0}}; MM^{2}", 200, 0.0, 2.0, 200, -1., 1.);
      dDeltaE_M3pi_CoplanarTag = GetOrCreate_Histogram<TH2I>("dDeltaE_M3pi_CoplanarTag", "#Delta E vs M_{#pi^{+}#pi^{-}#pi^{0}}: Coplanar Tag; M_{#pi^{+}#pi^{-}#pi^{0}}; #Delta E (tagger - p#pi^{+}#pi^{-}#pi^{0})", 200, 0.0, 2.0, 200, -5., 5.);
      dMM2_DeltaE_CoplanarTag = GetOrCreate_Histogram<TH2I>("dMM2_DeltaE_CoplanarTag", "MM^{2} vs #Delta E: Coplanar Tag; #Delta E (tagger - p#pi^{+}#pi^{-}#pi^{0}); MM^{2}", 200, -5., 5., 200, -1., 1.);
      
      dMM2_M3pi_ProtonTag = GetOrCreate_Histogram<TH2I>("MM2_M3pi_ProtonTag", "MM^{2} off p #pi^{+}#pi^{-}#pi^{0} vs M_{#pi^{+}#pi^{-}#pi^{0}}: Proton Tag; M_{#pi^{+}#pi^{-}#pi^{0}}; MM^{2}", 200, 0.0, 2.0, 200, -1., 1.);
      dDeltaE_M3pi_ProtonTag = GetOrCreate_Histogram<TH2I>("dDeltaE_M3pi_ProtonTag", "#Delta E vs M_{#pi^{+}#pi^{-}#pi^{0}}: Proton Tag; M_{#pi^{+}#pi^{-}#pi^{0}}; #Delta E (tagger - p#pi^{+}#pi^{-}#pi^{0})", 200, 0.0, 2.0, 200, -5., 5.);
      dMM2_DeltaE_ProtonTag = GetOrCreate_Histogram<TH2I>("dMM2_DeltaE_ProtonTag", "MM^{2} vs #Delta E: Proton Tag; #Delta E (tagger - p#pi^{+}#pi^{-}#pi^{0}); MM^{2}", 200, -5., 5., 200, -1., 1.);
      
      //Return to the base directory
      ChangeTo_BaseDirectory();
   }
   japp->RootUnLock(); //RELEASE ROOT LOCK!!
}

bool DCustomAction_ppi0gamma_hists::Perform_Action(JEventLoop* locEventLoop, const DParticleCombo* locParticleCombo)
{
   const DParticleComboStep* locParticleComboStep = locParticleCombo->Get_ParticleComboStep(0);

   // get beam photon energy and final state particles
   auto locBeamPhoton = Get_UseKinFitResultsFlag() ? locParticleComboStep->Get_InitialParticle() : locParticleComboStep->Get_InitialParticle_Measured();
   auto locParticles = Get_UseKinFitResultsFlag() ? locParticleComboStep->Get_FinalParticles() : locParticleComboStep->Get_FinalParticles_Measured();
        double locBeamPhotonEnergy = locBeamPhoton->energy();

   DLorentzVector locSumInitP4;
   locSumInitP4.SetXYZM(0, 0, 0, 0.938);
        locSumInitP4 += locBeamPhoton->lorentzMomentum();

   // calculate missing mass
   DLorentzVector locMissingP4 = dAnalysisUtilities->Calc_MissingP4(Get_Reaction(), locParticleCombo, Get_UseKinFitResultsFlag());
   
   // calculate 3pi mass
   DLorentzVector locOmegaP4 = dAnalysisUtilities->Calc_FinalStateP4(Get_Reaction(), locParticleCombo, 1, Get_UseKinFitResultsFlag());

   // reconstructed proton variables
   const DChargedTrack* locChargedTrack = static_cast<const DChargedTrack*>(locParticleComboStep->Get_FinalParticle_SourceObject(1));
   const DChargedTrackHypothesis* locChargedTrackHypothesis = locChargedTrack->Get_Hypothesis(Proton);
   double dEdx = locChargedTrackHypothesis->Get_TrackTimeBased()->dEdx()*1e6;
   DLorentzVector locProtonP4 = locChargedTrackHypothesis->lorentzMomentum(); 

   double dEdxCut = 2.2;

   //FILL HISTOGRAMS
   //Since we are filling histograms local to this action, it will not interfere with other ROOT operations: can use action-wide ROOT lock
   //Note, the mutex is unique to this DReaction + action_string combo: actions of same class with different hists will have a different mutex
   Lock_Action(); //ACQUIRE ROOT LOCK!!
   {
      // Fill histograms here
      dEgamma->Fill(locBeamPhotonEnergy);

      dMM2_M3pi->Fill(locOmegaP4.M(), locMissingP4.M2());
      dDeltaE_M3pi->Fill(locOmegaP4.M(),locMissingP4.E());

      double locDeltaPhi = (locProtonP4.Phi() - locOmegaP4.Phi())*180./TMath::Pi();
      if(locDeltaPhi > 360.) locDeltaPhi -= 360.;
      if(locDeltaPhi < 0.) locDeltaPhi += 360.;
      dPhi3pi_PhiP->Fill(locProtonP4.Phi()*180./TMath::Pi(), locOmegaP4.Phi()*180./TMath::Pi());
      dDeltaPhi_M3pi->Fill(locOmegaP4.M(), locDeltaPhi);
      
      // require proton and omega are back-to-back
      if(locDeltaPhi < 175. || locDeltaPhi > 185.)
      {
         Unlock_Action(); //RELEASE ROOT LOCK!!
         return true;
      }
      dMM2_M3pi_CoplanarTag->Fill(locOmegaP4.M(), locMissingP4.M2());
      dDeltaE_M3pi_CoplanarTag->Fill(locOmegaP4.M(),locMissingP4.E());
      if(locOmegaP4.M() > 0.7 && locOmegaP4.M() < 0.9)
         dMM2_DeltaE_CoplanarTag->Fill(locMissingP4.E(), locMissingP4.M2());
      
      // tag proton with dE/dx
      if(dEdx > dEdxCut) {
         dMM2_M3pi_ProtonTag->Fill(locOmegaP4.M(), locMissingP4.M2());
         dDeltaE_M3pi_ProtonTag->Fill(locOmegaP4.M(),locMissingP4.E());
         if(locOmegaP4.M() > 0.7 && locOmegaP4.M() < 0.9)
            dMM2_DeltaE_ProtonTag->Fill(locMissingP4.E(), locMissingP4.M2());
         
         // 3pi invariant mass for exclusive
         if(fabs(locMissingP4.M2()) < 0.05 && fabs(locMissingP4.E()) < 0.5) {
            dEgamma_M3pi_ProtonTag->Fill(locOmegaP4.M(),locBeamPhotonEnergy);
         }
      }
      
      if(fabs(locMissingP4.M2()) < 0.05 && fabs(locMissingP4.E()) < 0.5) {
         
         dProton_dEdx_P->Fill(locProtonP4.Vect().Mag(), dEdx);
         dProton_P_Theta->Fill(locProtonP4.Vect().Theta()*180/TMath::Pi(), locProtonP4.Vect().Mag());
         
      }
   }
   Unlock_Action(); //RELEASE ROOT LOCK!!

   return true; //return false if you want to use this action to apply a cut (and it fails the cut!)
}