New combinations added. By A.Morsch.

diff --git a/EVGEN/AliPythia.cxx b/EVGEN/AliPythia.cxx
index 5e060345d133813da89b7df9228561b3358b8848..5ed2f75a310ebf9f3d27cc9c921debf1e91ed317 100644 (file)
--- a/EVGEN/AliPythia.cxx
+++ b/EVGEN/AliPythia.cxx
@@ -1,3 +1,4 @@
+
 #include "AliPythia.h"
 #include "AliMC.h"
 ClassImp(AliPythia)
@@ -19,6 +20,14 @@ extern "C" void type_of_call
 
 Int_t AliPythia::fgInit=0;
 
+AliPythia::AliPythia()
+{
+    for (Int_t i=0; i<501; i++) {
+       fGPCode[i][0]=0; 
+       fGPCode[i][1]=0;
+    }
+}
+
 void  AliPythia::Lu1Ent(Int_t flag, Int_t idpart, 
                      Float_t mom, Float_t theta,Float_t phi)
 {
@@ -104,6 +113,28 @@ void AliPythia::ProcInit(Process_t process, Float_t energy, StrucFunc_t strucfun
 // gg->gg
        SetMSUB(68,1);
        break;
+    case mb:
+// Minimum Bias pp-Collisions
+//
+// Tuning of parameters descibed in G. Ciapetti and A. Di Ciaccio
+// Proc. of the LHC Workshop, Aachen 1990, Vol. II p. 155
+//   
+//      select Pythia min. bias model
+       SetMSEL(2);
+       SetMSUB(92,1);
+       SetMSUB(93,1);
+       SetMSUB(94,1);
+       SetMSUB(95,1);  
+//      Multiple interactions switched on
+       SetMSTP(81,1);
+       SetMSTP(82,1);
+//      Low-pT cut-off for hard scattering
+       SetPARP(81,1.9);
+//      model for subsequent non-hardest interaction
+//      90% gg->gg 10% gg->qq
+       SetPARP(86,0.9);
+//      90% of gluon interactions have minimum string length
+       SetPARP(85,0.9);
     }
 //
 //  Initialize PYTHIA
@@ -135,7 +166,9 @@ void AliPythia::ForceParticleDecay(Int_t particle, Int_t product, Int_t mult)
 {
 //
 //  force decay of particle into products with multiplicity mult
+
     Int_t kc=LuComp(particle);
+    SetMDCY(kc,1,1);
     Int_t ifirst=GetMDCY(kc,2);
     Int_t ilast=ifirst+GetMDCY(kc,3)-1;
     fBraPart[kc] = 1;
@@ -163,15 +196,18 @@ void AliPythia::ForceDecay(Decay_t decay)
     switch (decay) 
     {
     case semimuonic:
-       ForceParticleDecay(  411,13,1); // D+/-     
-       ForceParticleDecay(  421,13,1); // D0     
-       ForceParticleDecay(  431,13,1); // D_s     
-       ForceParticleDecay( 4122,13,1); // Lambda_c     
-       
-       ForceParticleDecay(  511,13,1); // B0     
-       ForceParticleDecay(  521,13,1); // B+/-     
-       ForceParticleDecay(  531,13,1); // B_s     
-       ForceParticleDecay( 5122,13,1); // Lambda_b     
+       if (fProcess==charm || fProcess == charm_unforced) {
+           ForceParticleDecay(  411,13,1); // D+/-     
+           ForceParticleDecay(  421,13,1); // D0     
+           ForceParticleDecay(  431,13,1); // D_s     
+           ForceParticleDecay( 4122,13,1); // Lambda_c     
+       }
+       if (fProcess==beauty || fProcess == beauty_unforced) {
+           ForceParticleDecay(  511,13,1); // B0     
+           ForceParticleDecay(  521,13,1); // B+/-     
+           ForceParticleDecay(  531,13,1); // B_s     
+           ForceParticleDecay( 5122,13,1); // Lambda_b    
+       }
     break;
     case dimuon:
        ForceParticleDecay(   41,13,2); // phi
@@ -228,6 +264,12 @@ void AliPythia::ForceDecay(Decay_t decay)
        ForceParticleDecay( 5122,30443,1); // Lambda_b 
        ForceParticleDecay(30443,11,2);    // Psi'   
        break;
+    case pitomu:
+       ForceParticleDecay(211,13,1); // pi->mu     
+       break;
+    case katomu:
+       ForceParticleDecay(321,13,1); // K->mu     
+       break;
     }
 }
 
@@ -287,7 +329,7 @@ void AliPythia::ForceDecay(Decay_t decay)
 //
 //          Vector mesons
 //
-// phi clone for dileptin decay-channel
+// phi clone for dilepton decay-channel
     kc=LuComp(41);         
     mass =GetPMAS(kc,1);
     tlife=GetPMAS(kc,4);

diff --git a/EVGEN/AliPythia.h b/EVGEN/AliPythia.h
index 54f65d34156f286810ccbf620ce7e1f73eed608c..3946aa17672deb7ef86d4d32d5da38f582e8e8f6 100644 (file)
--- a/EVGEN/AliPythia.h
+++ b/EVGEN/AliPythia.h
@@ -16,8 +16,8 @@ class AliPythia:public TPythia
     
  public:
     static Int_t fgInit;
-    AliPythia():TPythia(){}
-    virtual ~AliPythia(){}
+    AliPythia();
+    virtual ~AliPythia(){;}
     // convert to compressed code and print result (for debugging only)
     virtual Int_t CheckedLuComp(Int_t kf)
        {