electron cut included (Prabhat Ranjan Pujahari <p.pujahari@cern.ch>)

[u/mrichter/AliRoot.git] / EVGEN / AliGenCocktail.cxx

diff --git a/EVGEN/AliGenCocktail.cxx b/EVGEN/AliGenCocktail.cxx
index a1a038770c6bec0ad0ccfdf20d11a51881ccdbe9..2ac18c385f6ae409641bf7dbbf1db06edeef2129 100644 (file)
--- a/EVGEN/AliGenCocktail.cxx
+++ b/EVGEN/AliGenCocktail.cxx
@@ -25,11 +25,13 @@
 
 #include <TList.h>
 #include <TObjArray.h>
+#include <TFormula.h>
 
 #include "AliGenCocktail.h"
 #include "AliGenCocktailEntry.h"
 #include "AliCollisionGeometry.h"
 #include "AliRun.h"
+#include "AliLog.h"
 #include "AliMC.h"
 #include "AliGenCocktailEventHeader.h"
 
@@ -39,7 +41,7 @@ AliGenCocktail::AliGenCocktail()
     :AliGenerator(), 
      fNGenerators(0),
      fTotalRate(0.),
-     fRandom(kFALSE),
+     fSRandom(kFALSE),
      fUsePerEventRate(kFALSE),
      fProb(0),
      fEntries(0),
@@ -62,7 +64,7 @@ AliGenCocktail::~AliGenCocktail()
 }
 
 void AliGenCocktail::
-AddGenerator(AliGenerator *Generator, const char* Name, Float_t RateExp)
+AddGenerator(AliGenerator *Generator, const char* Name, Float_t RateExp, TFormula* formula, Int_t ntimes)
 {
 //
 // Add a generator to the list 
@@ -76,11 +78,11 @@ AddGenerator(AliGenerator *Generator, const char* Name, Float_t RateExp)
     if(TestBit(kMomentumRange) && !(Generator->TestBit(kPtRange)) && !(Generator->TestBit(kMomentumRange)))
        Generator->SetMomentumRange(fPMin,fPMax);
     
-    if (!(Generator->TestBit(kYRange)))    
+    if (TestBit(kYRange) && !(Generator->TestBit(kYRange)))
        Generator->SetYRange(fYMin,fYMax);
-    if (!(Generator->TestBit(kPhiRange)))   
+    if (TestBit(kPhiRange) && !(Generator->TestBit(kPhiRange)))
        Generator->SetPhiRange(fPhiMin*180/TMath::Pi(),fPhiMax*180/TMath::Pi());
-    if (!(Generator->TestBit(kThetaRange))) 
+    if (TestBit(kThetaRange) && !(Generator->TestBit(kThetaRange)) && !(Generator->TestBit(kEtaRange)))
        Generator->SetThetaRange(fThetaMin*180/TMath::Pi(),fThetaMax*180/TMath::Pi());
     if (!(Generator->TestBit(kVertexRange))) {
        Generator->SetOrigin(fOrigin[0], fOrigin[1], fOrigin[2]);
@@ -90,22 +92,23 @@ AddGenerator(AliGenerator *Generator, const char* Name, Float_t RateExp)
     }
     Generator->SetTrackingFlag(fTrackIt);
     Generator->SetContainer(this);
-    
+
         
 //
 //  Add generator to list   
     char theName[256];
-    sprintf(theName, "%s_%d",Name, fNGenerators);
+    snprintf(theName, 256, "%s_%d",Name, fNGenerators);
     Generator->SetName(theName);
 
     AliGenCocktailEntry *entry = 
        new AliGenCocktailEntry(Generator, Name, RateExp);
-    
+    if (formula) entry->SetFormula(formula);  
+    entry->SetNTimes(ntimes);
      fEntries->Add(entry);
      fNGenerators++;
      flnk1 = 0;
      flnk2 = 0;
-     fRandom  = kFALSE;
+     fSRandom  = kFALSE;
      fHeader  = 0;
 }
 
@@ -123,7 +126,7 @@ AddGenerator(AliGenerator *Generator, const char* Name, Float_t RateExp)
 
     next.Reset();
 
-    if (fRandom) {
+    if (fSRandom) {
        fProb.Set(fNGenerators);
        next.Reset();
        Float_t sum = 0.;
@@ -161,13 +164,14 @@ AddGenerator(AliGenerator *Generator, const char* Name, Float_t RateExp)
     TIter next(fEntries);
     AliGenCocktailEntry *entry = 0;
     AliGenCocktailEntry *preventry = 0;
+    AliGenCocktailEntry *collentry = 0;
     AliGenerator* gen = 0;
     if (fHeader) delete fHeader;
 
     
     fHeader = new AliGenCocktailEventHeader("Cocktail Header");
 
-    TObjArray *partArray = gAlice->GetMCApp()->Particles();
+    const TObjArray *partArray = gAlice->GetMCApp()->Particles();
 
 //
 //  Generate the vertex position used by all generators
@@ -178,38 +182,63 @@ AddGenerator(AliGenerator *Generator, const char* Name, Float_t RateExp)
     eventVertex.Set(3);
     for (Int_t j=0; j < 3; j++) eventVertex[j] = fVertex[j];
 
-    if (!fRandom) {
+    if (!fSRandom) {
        //
        // Loop over generators and generate events
-       Int_t igen=0;
+       Int_t igen   = 0;
        while((entry = (AliGenCocktailEntry*)next())) {
-           if (fUsePerEventRate && (gRandom->Rndm() > entry->Rate())) continue;
-           
-           igen++;
-           if (igen ==1) {
-               entry->SetFirst(0);
-           } else {
-               entry->SetFirst((partArray->GetEntriesFast())+1);
-           }
-//
-//      Handle case in which current generator needs collision geometry from previous generator
-//
-           gen = entry->Generator();
-           if (gen->NeedsCollisionGeometry())
+          Int_t ntimes = entry->NTimes();
+         if (fUsePerEventRate && (gRandom->Rndm() > entry->Rate())) continue;
+         
+         igen++;
+         if (igen ==1) {
+           entry->SetFirst(0);
+         } else {
+           entry->SetFirst((partArray->GetEntriesFast())+1);
+         }
+         gen = entry->Generator();
+         if (gen->ProvidesCollisionGeometry()) collentry = entry; 
+         //
+         //      Handle case in which current generator needs collision geometry from previous generator
+          //
+         if (gen->NeedsCollisionGeometry() && (entry->Formula() == 0))
            {
-               if (preventry && preventry->Generator()->ProvidesCollisionGeometry())
+             if (preventry && preventry->Generator()->ProvidesCollisionGeometry())
                {
-                   gen->SetCollisionGeometry(preventry->Generator()->CollisionGeometry());
+                 gen->SetCollisionGeometry(preventry->Generator()->CollisionGeometry());
                } else {
-                   Fatal("Generate()", "No Collision Geometry Provided");
-               }
+               Fatal("Generate()", "No Collision Geometry Provided");
+             }
+           }
+         //
+         //      Number of signals is calculated from Collision Geometry
+         //      and entry with given centrality bin is selected
+         //
+         if (entry->Formula() != 0)
+           {
+             if (!collentry) {
+               Fatal("Generate()", "No Collision Geometry Provided");
+               return;
+             }
+             AliCollisionGeometry* coll = (collentry->Generator())->CollisionGeometry();
+             Float_t b  = coll->ImpactParameter();
+             Int_t nsig = Int_t(entry->Formula()->Eval(b));
+             Int_t bin = entry->Bin() - 100;
+             if (bin > 0) {
+               if (bin != nsig) continue;
+             } else {
+               if (nsig < 1) nsig = 1;
+               AliInfo(Form("Signal Events %13.3f %5d %5d\n", b, coll->HardScatters(), nsig));
+               ntimes = nsig;
+             }
            }
-           entry->Generator()->SetVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2));
-           entry->Generator()->Generate();
-           entry->SetLast(partArray->GetEntriesFast());
-           preventry = entry;
-       }  
-    } else if (fRandom) {
+         gen->SetVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2), fTime);
+         
+         gen->GenerateN(ntimes);
+         entry->SetLast(partArray->GetEntriesFast());
+         preventry = entry;
+       }
+    } else if (fSRandom) {
        //
        // Select a generator randomly
        //
@@ -223,8 +252,8 @@ AddGenerator(AliGenerator *Generator, const char* Name, Float_t RateExp)
        entry = (AliGenCocktailEntry*) fEntries->At(i);
        entry->SetFirst(0);
        gen = entry->Generator();
-       entry->Generator()->SetVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2));
-       entry->Generator()->Generate();
+       gen->SetVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2), fTime);
+       gen->Generate();
        entry->SetLast(partArray->GetEntriesFast());
     }