Add lambda gun

Author: fmazzasc

MC/config/PWGLF/ini/GeneratorLFLambdapp.ini

@@ -0,0 +1,9 @@
+[GeneratorExternal]
+fileName=${O2DPG_ROOT}/MC/config/PWGLF/pythia8/generator_pythia8_longlived.C
+funcName=generateLongLived(3122, 10)
+
+[GeneratorPythia8]
+config=${O2_ROOT}/share/Generators/egconfig/pythia8_inel.cfg
+
+[DecayerPythia8]
+config[0]=${O2_ROOT}/share/Generators/pythia8/decays/hypertriton.cfg

MC/config/PWGLF/pythia8/generator_pythia8_longlived.C

@@ -66,8 +66,8 @@ public:
 private:
   double genMinPt = 0.5;  /// minimum 3-momentum for generated particles
   double genMaxPt = 12.;  /// maximum 3-momentum for generated particles
-  double genMinEta = -1.; /// minimum pseudorapidity for generated particles
-  double genMaxEta = +1.; /// maximum pseudorapidity for generated particles
+  double genMinEta = -8.; /// minimum pseudorapidity for generated particles
+  double genMaxEta = +8.; /// maximum pseudorapidity for generated particles
 
   double m = 0;       /// particle mass [GeV/c^2]
   int pdg = 0;        /// particle pdg code