kPyJet: PARP(67) set to 2.5. ISR parameter that describes best the D0 djet analysis.

diff --git a/PYTHIA6/AliPythia.cxx b/PYTHIA6/AliPythia.cxx
index 7f2663d3587a6142ad0edcdc927838904e2b724c..7e6f0702ada76beef433f7ab69f4d8bb4572ea7b 100644 (file)
--- a/PYTHIA6/AliPythia.cxx
+++ b/PYTHIA6/AliPythia.cxx
@@ -309,7 +309,7 @@ void AliPythia::ProcInit(Process_t process, Float_t energy, StrucFunc_t strucfun
        SetMSEL(1);
  // Pythia Tune A (CDF)
  //
-       SetPARP(67,4.);            // Regulates Initial State Radiation
+       SetPARP(67,2.5);           // Regulates Initial State Radiation (value from best fit to D0 dijet analysis)
        SetMSTP(82,4);             // Double Gaussian Model
        SetPARP(82,2.0);           // [GeV]    PT_min at Ref. energy
        SetPARP(84,0.4);           // Core radius
@@ -550,9 +550,8 @@ void AliPythia::ProcInit(Process_t process, Float_t energy, StrucFunc_t strucfun
 //
 //  Initialize PYTHIA
     SetMSTP(41,1);   // all resonance decays switched on
-
     Initialize("CMS","p","p",fEcms);
-
+    
 }
 
 Int_t AliPythia::CheckedLuComp(Int_t kf)