fix bugs in fwd configuration

Author: ypwangg

MC/config/PWGDQ/external/generator/generator_pythia8_StarlightTriggered_withGap.C

@@ -193,6 +193,20 @@ FairGenerator*
   gen->addSignalPDGs(11); // e
 //   auto seed = (gRandom->TRandom::GetSeed() % 900000000);
 //   gen->readString("Random:setSeed on");
+//   gen->readString("Random:seed " + std::to_string(seed));
+  return gen;
+}
+
+FairGenerator*
+  GeneratorPhotoproductionFwd(int triggerGap, int gentype = 0, double rapidityMin = -1.5, double rapidityMax = 1.5)
+{
+  auto gen = new o2::eventgen::GeneratorPythia8StarlightTriggeredWithGap(triggerGap, gentype);
+  gen->setRapidityRange(rapidityMin, rapidityMax);
+  gen->addSignalPDGs(443); // J/Psi
+  gen->addSignalPDGs(100443); // Psi(2S)
+  gen->addSignalPDGs(13); // mu
+//   auto seed = (gRandom->TRandom::GetSeed() % 900000000);
+//   gen->readString("Random:setSeed on");
 //   gen->readString("Random:seed " + std::to_string(seed));
   return gen;
 }

MC/config/PWGDQ/ini/Generator_InjectedCoherentCharmoniaFwdy_PbPb5TeV.ini

@@ -1,5 +1,5 @@
 [GeneratorExternal] 
 fileName = ${O2DPG_MC_CONFIG_ROOT}/MC/config/PWGDQ/external/generator/generator_pythia8_StarlightTriggered_withGap.C 
-funcName = GeneratorPhotoproduction(2, 3, 2.0, 4.5)
+funcName = GeneratorPhotoproduction(2, 3, -2.0, -4.5)
 [GeneratorPythia8]
 config = ${O2DPG_MC_CONFIG_ROOT}/MC/config/ALICE3/pythia8/generator/pythia8_PbPb_536tev.cfg

MC/config/PWGDQ/ini/Generator_InjectedIncoherentCharmoniaFwdy_PbPb5TeV.ini

@@ -1,5 +1,5 @@
 [GeneratorExternal] 
 fileName = ${O2DPG_MC_CONFIG_ROOT}/MC/config/PWGDQ/external/generator/generator_pythia8_StarlightTriggered_withGap.C 
-funcName = GeneratorPhotoproduction(2, 4, 2.0, 4.5)
+funcName = GeneratorPhotoproduction(2, 4, -2.0, -4.5)
 [GeneratorPythia8]
 config = ${O2DPG_MC_CONFIG_ROOT}/MC/config/ALICE3/pythia8/generator/pythia8_PbPb_536tev.cfg

MC/config/PWGDQ/ini/tests/Generator_InjectedCoherentCharmoniaFwdy_PbPb5TeV.C

@@ -16,7 +16,7 @@ int External() {
 
     int checkPdgSignal[2] = {443, 100443};
     int checkPdgDecay = 13;
-    double rapiditymin = 2.0; double rapiditymax = 4.5;
+    double rapiditymin = -2.0; double rapiditymax = -4.5;
 
     int nLeptons{};
     int nAntileptons{};

MC/config/PWGDQ/ini/tests/Generator_InjectedIncoherentCharmoniaFwdy_PbPb5TeV.C

@@ -16,7 +16,7 @@ int External() {
 
     int checkPdgSignal[2] = {443, 100443};
     int checkPdgDecay = 13;
-    double rapiditymin = 2.0; double rapiditymax = 4.5;
+    double rapiditymin = -2.0; double rapiditymax = -4.5;
 
     int nLeptons{};
     int nAntileptons{};