added particle a2(1320) in the O2Database for the study of glueball

(cherry picked from commit 6b8ca30)

Author: sawankumawat

DataFormats/simulation/include/SimulationDataFormat/O2DatabasePDG.h

@@ -490,6 +490,10 @@ inline void O2DatabasePDG::addALICEParticles(TDatabasePDG* db)
   }
 
   // glueball hunting
+  ionCode = 115;
+  if (!db->GetParticle(ionCode)) {
+    db->AddParticle("a2_1320", "a2_1320", 1.3182, kFALSE, 0.1078, 0, "Resonance", ionCode);
+  }
   ionCode = 10221;
   if (!db->GetParticle(ionCode)) {
     db->AddParticle("f0_1370", "f0_1370", 1.37, kFALSE, 0.200, 0, "Resonance", ionCode);

Steer/src/O2MCApplication.cxx

@@ -360,6 +360,8 @@ void addSpecialParticles()
   // Their life times are not known, so we set them to 1e-24
   // f0(1370) (PDG: width = 200-500 MeV) Spin/Parity might not be correct
   TVirtualMC::GetMC()->DefineParticle(10221, "f0_1370", kPTNeutron, 1.37, 0.0, 1e-24, "Hadron", 0.2, 1, 1, 1, 0, 0, 1, 0, 0, kTRUE);
+  // a2(1320) (PDG: width = 107.8 MeV) (Spin/Parity might not be correct)
+  TVirtualMC::GetMC()->DefineParticle(115, "a2_1320", kPTNeutron, 1.3182, 0.0, 1e-24, "Hadron", 0.1078, 1, 1, 1, 1, 0, 1, 0, 0, kTRUE);
   // f0(1500) (PDG: width = 112 MeV) Spin/Parity might not be correct
   TVirtualMC::GetMC()->DefineParticle(9030221, "f0_1500", kPTNeutron, 1.506, 0.0, 1e-24, "Hadron", 0.112, 0, 1, 1, 0, 0, 1, 0, 0, kTRUE);
   // f0(1710) (PDG: width = 139 MeV) Spin/Parity might not be correct
@@ -1166,6 +1168,7 @@ void addSpecialParticles()
   TVirtualMC::GetMC()->SetDecayMode(335, bratio, mode);     // f2(1525)
   TVirtualMC::GetMC()->SetDecayMode(10331, bratio, mode);   // f0(1710)
   TVirtualMC::GetMC()->SetDecayMode(10221, bratio, mode);   // f0(1370)
+  TVirtualMC::GetMC()->SetDecayMode(115, bratio, mode);     // a2(1320)
 
   // Define the 3-body phase space decay for the resonances: f1(1285), f1(1420)
   for (Int_t kz = 0; kz < 6; kz++) {