diff --git a/Common/Constants/include/CommonConstants/PhysicsConstants.h b/Common/Constants/include/CommonConstants/PhysicsConstants.h
index 10351c965af3a..6a8a791cffd22 100644
--- a/Common/Constants/include/CommonConstants/PhysicsConstants.h
+++ b/Common/Constants/include/CommonConstants/PhysicsConstants.h
@@ -75,7 +75,8 @@ enum Pdg {
   kHyperTriton = 1010010030,
   kHyperHydrogen4 = 1010010040,
   kHyperHelium4 = 1010020040,
-  kHyperHelium5 = 1010020050
+  kHyperHelium5 = 1010020050,
+  kHyperHelium4Sigma = 1110020040
 };
 
 /// \brief Declarations of masses for additional particles
@@ -124,6 +125,7 @@ constexpr double MassHyperTriton = 2.99131;
 constexpr double MassHyperHydrogen4 = 3.9226;
 constexpr double MassHyperHelium4 = 3.9217;
 constexpr double MassHyperHelium5 = 4.841;
+constexpr double MassHyperHelium4Sigma = 3.995;
 
 /// \brief Declarations of masses for particles in ROOT PDG_t
 constexpr double MassDown = 0.00467;
@@ -194,6 +196,7 @@ constexpr double MassKaonNeutral = MassK0;
 constexpr double MassLambda = MassLambda0;
 constexpr double MassHyperhydrog4 = MassHyperHydrogen4;
 constexpr double MassHyperhelium4 = MassHyperHelium4;
+constexpr double MassHyperhelium4sigma = MassHyperHelium4Sigma;
 
 // Light speed
 constexpr float LightSpeedCm2S = 299792458.e2;            // C in cm/s
diff --git a/Common/Constants/include/CommonConstants/make_pdg_header.py b/Common/Constants/include/CommonConstants/make_pdg_header.py
index b71bff40b0011..5c1e4602a9fbb 100755
--- a/Common/Constants/include/CommonConstants/make_pdg_header.py
+++ b/Common/Constants/include/CommonConstants/make_pdg_header.py
@@ -131,6 +131,7 @@ class Pdg(Enum):
     kHyperHydrogen4 = 1010010040
     kHyperHelium4 = 1010020040
     kHyperHelium5 = 1010020050
+    kHyperHelium4Sigma = 1110020040
 
 
 dbPdg = ROOT.o2.O2DatabasePDG
diff --git a/DataFormats/simulation/include/SimulationDataFormat/O2DatabasePDG.h b/DataFormats/simulation/include/SimulationDataFormat/O2DatabasePDG.h
index d89443150e199..3487f7a0e5aef 100644
--- a/DataFormats/simulation/include/SimulationDataFormat/O2DatabasePDG.h
+++ b/DataFormats/simulation/include/SimulationDataFormat/O2DatabasePDG.h
@@ -331,6 +331,19 @@ inline void O2DatabasePDG::addALICEParticles(TDatabasePDG* db)
                     2.5e-15, 6, "Ion", ionCode);
   }
 
+  // hyper helium 4 sigma
+  ionCode = 1110020040;
+  if (!db->GetParticle(ionCode)) {
+    db->AddParticle("Hyperhelium4sigma", "Hyperhelium4sigma", 3.995, kFALSE,
+                    2.5e-15, 6, "Ion", ionCode);
+  }
+  // anti-hyper helium 4 sigma
+  ionCode = -1110020040;
+  if (!db->GetParticle(ionCode)) {
+    db->AddParticle("AntiHyperhelium4sigma", "AntiHyperhelium4sigma", 3.995, kFALSE,
+                    2.5e-15, 6, "Ion", ionCode);
+  }
+
   ionCode = 1010000020;
   if (!db->GetParticle(ionCode)) {
     db->AddParticle("LambdaNeutron", "LambdaNeutron", 2.054, kFALSE,
diff --git a/Steer/src/O2MCApplication.cxx b/Steer/src/O2MCApplication.cxx
index ed4735b21b46a..240e56aba28c4 100644
--- a/Steer/src/O2MCApplication.cxx
+++ b/Steer/src/O2MCApplication.cxx
@@ -303,6 +303,11 @@ void addSpecialParticles()
   //Double Anti-Hyper hydrogen 4
   TVirtualMC::GetMC()->DefineParticle(-1020010040, "DoubleAntiHyperhydrogen4", kPTHadron, 4.106, 1.0, 2.632e-10, "Ion", 0.0, 0, 1, 0, 0, 0, 0, 0, 4, kFALSE);
 
+  // Hyper helium 4 sigma
+  TVirtualMC::GetMC()->DefineParticle(1110020040, "Hyperhelium4sigma", kPTHadron, 3.995, 2.0, 8.018e-11, "Ion", 0.0, 0, 1, 0, 0, 0, 0, 0, 4, kFALSE);
+  // Anti-Hyper helium 4 sigma
+  TVirtualMC::GetMC()->DefineParticle(-1110020040, "AntiHyperhelium4sigma", kPTHadron, 3.995, 2.0, 8.018e-11, "Ion", 0.0, 0, 1, 0, 0, 0, 0, 0, 4, kFALSE);
+
   //Lambda-Neutron
   TVirtualMC::GetMC()->DefineParticle(1010000020, "LambdaNeutron", kPTNeutron, 2.054, 0.0, 2.632e-10, "Hadron", 0.0, 0, 1, 0, 0, 0, 0, 0, 2, kFALSE);
 
@@ -748,6 +753,54 @@ void addSpecialParticles()
 
   TVirtualMC::GetMC()->SetDecayMode(-1020010040, abratio42, amode42);
 
+  // Define the 2- and 3-body phase space decay for the Hyper Helium 4 sigma
+  Int_t mode4s[6][3];
+  Float_t bratio4s[6];
+
+  for (Int_t kz = 0; kz < 6; kz++) {
+    bratio4s[kz] = 0.;
+    mode4s[kz][0] = 0;
+    mode4s[kz][1] = 0;
+    mode4s[kz][2] = 0;
+  }
+  bratio4s[0] = 20.;
+  mode4s[0][0] = 1000020040; // Helium4
+  mode4s[0][1] = 111;        // pion0
+  bratio4s[1] = 40.;
+  mode4s[1][0] = 1000010030; // tritium
+  mode4s[1][2] = 2212;       // proton
+  mode4s[1][1] = 111;        // pion0
+  bratio4s[2] = 40.;
+  mode4s[2][0] = 1000010030; // tritium
+  mode4s[2][2] = 2212;       // pion+
+  mode4s[2][1] = 2112;       // neutron
+
+  TVirtualMC::GetMC()->SetDecayMode(1110020040, bratio4s, mode4s);
+
+  // Define the 2- and 3-body phase space decay for the Anti Hyper Helium 4 sigma
+  Int_t amode4s[6][3];
+  Float_t abratio4s[6];
+
+  for (Int_t kz = 0; kz < 6; kz++) {
+    abratio4s[kz] = 0.;
+    amode4s[kz][0] = 0;
+    amode4s[kz][1] = 0;
+    amode4s[kz][2] = 0;
+  }
+  abratio4s[0] = 50.;
+  amode4s[0][0] = -1000020040; // anti-Helium4
+  amode4s[0][1] = 111;         // pion0
+  abratio4s[1] = 50.;
+  amode4s[1][0] = -1000010030; // anti-tritium
+  amode4s[1][2] = -2212;       // anti-proton
+  amode4s[1][1] = 111;         // pion0
+  abratio4s[2] = 50.;
+  amode4s[2][0] = -1000010030; // anti-tritium
+  amode4s[2][2] = -211;        // pion-
+  amode4s[2][1] = -2112;       // anti-neutron
+
+  TVirtualMC::GetMC()->SetDecayMode(-1110020040, abratio4s, amode4s);
+
   // Define the 2-body phase space decay for the Lambda-neutron boundstate
   Int_t mode1[6][3];
   Float_t bratio1[6];