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Add Lambda1405 to TDatabasePdg and O2MCApplication #14506

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Merged
shahor02 merged 3 commits into from
Jul 28, 2025
Merged

Add Lambda1405 to TDatabasePdg and O2MCApplication #14506

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6c28332
Add Lambda1405 to TDatabasePdg and O2MCApplication
Jul 11, 2025
05148ee
Please consider the following formatting changes
alibuild Jul 11, 2025
f88bf25
Merge pull request #28 from alibuild/alibot-cleanup-14506
fmazzasc Jul 13, 2025
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9 changes: 9 additions & 0 deletions DataFormats/simulation/include/SimulationDataFormat/O2DatabasePDG.h
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Original file line number Diff line number Diff line change
Expand Up @@ -470,6 +470,15 @@ inline void O2DatabasePDG::addALICEParticles(TDatabasePDG* db)
0.185, 0, "Resonance", ionCode);
}

// Lambda(1405)0
ionCode = 102132;
if (!db->GetParticle(ionCode)) {
db->AddParticle("Lambda_1405_0", "Lambda_1405_0", 1.405, kFALSE, 0.05, 0, "Resonance", ionCode);
}
if (!db->GetParticle(-ionCode)) {
db->AddParticle("AntiLambda_1405_0", "AntiLambda_1405_0", 1.405, kFALSE, 0.05, 0, "Resonance", -ionCode);
}

// Lambda(1520)0
ionCode = 102134;
if (!db->GetParticle(ionCode)) {
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41 changes: 41 additions & 0 deletions Steer/src/O2MCApplication.cxx
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Expand Up @@ -383,6 +383,10 @@ void addSpecialParticles()
// f1(1420) (PDG: width = 54 MeV) Spin/Parity might not be correct
TVirtualMC::GetMC()->DefineParticle(20333, "f1_1420", kPTNeutron, 1.42640, 0.0, 1e-24, "Hadron", 0.05490, 3, 1, 0, 0, 0, 0, 0, 1, kTRUE);

// lambda1405 (PDG: width = 50 MeV)
TVirtualMC::GetMC()->DefineParticle(102132, "Lambda1405", kPTNeutron, 1.405, 0.0, 1.316e-23, "Hadron", 0.050, 0, 1, 0, 0, 0, 0, 0, 2, kTRUE);
TVirtualMC::GetMC()->DefineParticle(-102132, "AntiLambda1405", kPTNeutron, 1.405, 0.0, 1.316e-23, "Hadron", 0.050, 0, 1, 0, 0, 0, 0, 0, 2, kTRUE);

// Glueball hunting family
// 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
Expand Down Expand Up @@ -1380,6 +1384,43 @@ void addSpecialParticles()
TVirtualMC::GetMC()->SetDecayMode(20223, bratio2, mode); // f1(1285)
TVirtualMC::GetMC()->SetDecayMode(20333, bratio2, mode); // f1(1420)

// Define the decay modes for the Lambda(1405)
for (Int_t kz = 0; kz < 6; kz++) {
bratio[kz] = 0.;
mode[kz][0] = 0;
mode[kz][1] = 0;
mode[kz][2] = 0;
}
// 33.3 % sigma-pi+, sigma+pi-, sigma0pi0
bratio[0] = 33.3;
mode[0][0] = 3112; // Sigma-
mode[0][1] = 211; // negative pion
bratio[1] = 33.3;
mode[1][0] = 3222; // Sigma+
mode[1][1] = -211; // positive pion
bratio[2] = 33.3;
mode[2][0] = 3212; // Sigma0
mode[2][1] = 111; // neutral pion
TVirtualMC::GetMC()->SetDecayMode(102132, bratio, mode); // Lambda(1405)
// Define the decay modes for the Anti-Lambda(1405)
for (Int_t kz = 0; kz < 6; kz++) {
abratio[kz] = 0.;
amode[kz][0] = 0;
amode[kz][1] = 0;
amode[kz][2] = 0;
}
// 33.3 % sigma-pi-, sigma-pi+, sigma0pi0
abratio[0] = 33.3;
amode[0][0] = -3112; // AntiSigma-
amode[0][1] = -211; // positive pion
abratio[1] = 33.3;
amode[1][0] = -3222; // AntiSigma+
amode[1][1] = 211; // negative pion
abratio[2] = 33.3;
amode[2][0] = -3212; // Sigma0
amode[2][1] = 111; // negative pion
TVirtualMC::GetMC()->SetDecayMode(-102132, abratio, amode); // Anti-Lambda(1405)

// Lambda1520/Lambda1520bar

TVirtualMC::GetMC()->DefineParticle(102134, "Lambda1520", kPTNeutron, 1.5195, 0.0, 4.22e-23, "Hadron", 0.0156, 3, -1, 0, 0, 0, 0, 0, 1, kTRUE);
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