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Add double-omega decay information #15660

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d8f56ad
Add double-omega decay information
Aug 3, 2026
06ef95b
Fix mass value and width
Aug 4, 2026
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8 changes: 4 additions & 4 deletions DataFormats/simulation/include/SimulationDataFormat/O2DatabasePDG.h
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Original file line number Diff line number Diff line change
Expand Up @@ -408,14 +408,14 @@ inline void O2DatabasePDG::addALICEParticles(TDatabasePDG* db)

ionCode = 1060020020;
if (!db->GetParticle(ionCode)) {
db->AddParticle("OmegaOmega", "OmegaOmega", 3.229, kFALSE,
2.5e-15, 6, "Special", ionCode);
db->AddParticle("OmegaOmega", "OmegaOmega", 3.343, kFALSE,
8.01e-15, 6, "Special", ionCode);
}

ionCode = -1060020020;
if (!db->GetParticle(ionCode)) {
db->AddParticle("AntiOmegaOmega", "AntiOmegaOmega", 3.229, kFALSE,
2.5e-15, 6, "Special", ionCode);
db->AddParticle("AntiOmegaOmega", "AntiOmegaOmega", 3.343, kFALSE,
8.01e-15, 6, "Special", ionCode);
}

ionCode = 1010010021;
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31 changes: 25 additions & 6 deletions Steer/src/O2MCApplication.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -410,10 +410,10 @@ void addSpecialParticles()
TVirtualMC::GetMC()->DefineParticle(-1030010020, "AntiOmegaNeutron", kPTHadron, 2.472, 1.0, 2.190e-22, "Hadron", 0.0, 2, 1, 0, 0, 0, 0, 0, 2, kFALSE);

//Omega-Omega
TVirtualMC::GetMC()->DefineParticle(1060020020, "OmegaOmega", kPTHadron, 3.229, 2.0, 2.632e-10, "Hadron", 0.0, 0, 1, 0, 0, 0, 0, 0, 2, kFALSE);
TVirtualMC::GetMC()->DefineParticle(1060020020, "OmegaOmega", kPTHadron, 3.343, -2.0, 8.21e-11, "Hadron", 0.0, 0, 1, 0, 0, 0, 0, 0, 2, kFALSE);

//Anti-Omega-Omega
TVirtualMC::GetMC()->DefineParticle(-1060020020, "AntiOmegaOmega", kPTHadron, 3.229, 2.0, 2.632e-10, "Hadron", 0.0, 0, 1, 0, 0, 0, 0, 0, 2, kFALSE);
TVirtualMC::GetMC()->DefineParticle(-1060020020, "AntiOmegaOmega", kPTHadron, 3.343, 2.0, 8.21e-11, "Hadron", 0.0, 0, 1, 0, 0, 0, 0, 0, 2, kFALSE);

//Lambda(1405)-Proton
TVirtualMC::GetMC()->DefineParticle(1010010021, "Lambda1405Proton", kPTHadron, 2.295, 1.0, 1.316e-23, "Hadron", 0.0, 0, 1, 0, 0, 0, 0, 0, 2, kFALSE);
Expand Down Expand Up @@ -1183,6 +1183,7 @@ void addSpecialParticles()
TVirtualMC::GetMC()->SetDecayMode(-1030010020, abratio8, amode8);

// Define the 3-body phase space decay for the Omega-Omega
// Assuming that one of the Omegas decays freely inside the nucleus
Int_t mode9[6][3];
Float_t bratio9[6];

Expand All @@ -1192,9 +1193,18 @@ void addSpecialParticles()
mode9[kz][1] = 0;
mode9[kz][2] = 0;
}
bratio9[0] = 100.;
bratio9[0] = 68.;
mode9[0][0] = 3334; // negative Omega
mode9[0][1] = 3312; // negative Xi
mode9[0][1] = 3122; // Lambda
mode9[0][2] = -321; // negative Kaon
bratio9[1] = 24;
mode9[1][0] = 3334; // negative Omega
mode9[1][1] = 3322; // neutral Xi
mode9[1][2] = -211; // negative pion
bratio9[2] = 8.;
mode9[2][0] = 3334; // negative Omega
mode9[2][1] = 3312; // negative Xi
mode9[2][2] = 111; // neutral pion

TVirtualMC::GetMC()->SetDecayMode(1060020020, bratio9, mode9);

Expand All @@ -1208,9 +1218,18 @@ void addSpecialParticles()
amode9[kz][1] = 0;
amode9[kz][2] = 0;
}
abratio9[0] = 100.;
abratio9[0] = 68.;
amode9[0][0] = -3334; // positive Omega
amode9[0][1] = -3312; // positive Xi
amode9[0][1] = -3122; // anti-Lambda
amode9[0][2] = 321; // positive Kaon
abratio9[1] = 24.;
amode9[1][0] = -3334; // positive Omega
amode9[1][1] = -3322; // anti-neutral Xi
amode9[1][2] = 211; // positive pion
abratio9[2] = 8.;
amode9[2][0] = -3334; // positive Omega
amode9[2][1] = -3312; // positive Xi
amode9[2][2] = 111; // neutral pion

TVirtualMC::GetMC()->SetDecayMode(-1060020020, abratio9, amode9);

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