Changes in modules/PileUpMerger.cc [2d494a6:099becf] in git

File:

• modules/PileUpMerger.cc (modified) (7 diffs)

modules/PileUpMerger.cc

@@ -115 +115 @@
   TDatabasePDG *pdg = TDatabasePDG::Instance();
   TParticlePDG *pdgParticle;
-  Int_t pid;
+  Int_t pid, nch, nvtx = -1;
   Float_t x, y, z, t, vx, vy;
-  Float_t px, py, pz, e;
-  Double_t dz, dphi, dt;
+  Float_t px, py, pz, e, pt;
+  Double_t dz, dphi, dt, sumpt2, dz0, dt0;
   Int_t numberOfEvents, event, numberOfParticles;
   Long64_t allEntries, entry;
@@ -132 +132 @@
   fFunction->GetRandom2(dz, dt);
 
+  dz0 = -1.0e6;
+  dt0 = -1.0e6;
+  
   dt *= c_light*1.0E3; // necessary in order to make t in mm/c
   dz *= 1.0E3; // necessary in order to make z in mm
+  
+  //cout<<dz<<","<<dt<<endl;
+ 
   vx = 0.0;
   vy = 0.0;
+  
   numberOfParticles = fInputArray->GetEntriesFast();
+  nch = 0;
+  sumpt2 = 0.0; 
+   
   while((candidate = static_cast<Candidate*>(fItInputArray->Next())))
   {
@@ -143 +153 @@
     z = candidate->Position.Z();
     t = candidate->Position.T();
-    candidate->Position.SetZ(z + dz);
-    candidate->Position.SetT(t + dt);
+    pt = candidate->Momentum.Pt();
+       
+    // take postion and time from first stable particle
+    if (dz0 < -999999.0)
+      dz0 = z;
+    if (dt0 < -999999.0)
+      dt0 = t;
+
+    // cancel any possible offset in position and time the input file
+    candidate->Position.SetZ(z - dz0 + dz);
+    candidate->Position.SetT(t - dt0 + dt);
+    
     fParticleOutputArray->Add(candidate);
-  }
-
+ 
+    if(TMath::Abs(candidate->Charge) >  1.0E-9)
+    {
+      nch++;    
+      sumpt2 += pt*pt;
+    }  
+  }
+ 
   if(numberOfParticles > 0)
   {
-    vx /= numberOfParticles;
-    vy /= numberOfParticles;
-  }
-
+    vx /= sumpt2;
+    vy /= sumpt2;
+  }
+  
+  nvtx++;
   factory = GetFactory();
 
   vertex = factory->NewCandidate();
   vertex->Position.SetXYZT(vx, vy, dz, dt);
+  vertex->ClusterIndex = nvtx;
+  vertex->ClusterNDF = nch;
+  vertex->SumPT2 = sumpt2;
+  vertex->GenSumPT2 = sumpt2; 
+  
   fVertexOutputArray->Add(vertex);
 
@@ -170 +202 @@
       numberOfEvents = gRandom->Integer(2*fMeanPileUp + 1);
       break;
+    case 2:
+      numberOfEvents = fMeanPileUp;
+      break;   
     default:
       numberOfEvents = gRandom->Poisson(fMeanPileUp);
@@ -198 +233 @@
     vx = 0.0;
     vy = 0.0;
+    
     numberOfParticles = 0;
+    sumpt2 = 0.0;
+    
     while(fReader->ReadParticle(pid, x, y, z, t, px, py, pz, e))
     {
@@ -224 +262 @@
       vx += candidate->Position.X();
       vy += candidate->Position.Y();
+      
       ++numberOfParticles;
-
+      if(TMath::Abs(candidate->Charge) >  1.0E-9)
+      {
+        nch++;    
+        sumpt2 += pt*pt;
+      } 
+       
       fParticleOutputArray->Add(candidate);
     }
@@ -234 +278 @@
       vy /= numberOfParticles;
     }
+    
+    nvtx++;
 
     vertex = factory->NewCandidate();
     vertex->Position.SetXYZT(vx, vy, dz, dt);
+    
+    vertex->ClusterIndex = nvtx; 
+    vertex->ClusterNDF = nch;
+    vertex->SumPT2 = sumpt2;
+    vertex->GenSumPT2 = sumpt2;
+    
     vertex->IsPU = 1;
 
     fVertexOutputArray->Add(vertex);
-  }
-}
-
-//------------------------------------------------------------------------------
+    
+  }
+}
+
+//------------------------------------------------------------------------------