From 6c283321075fa3b475254fe05046c5db77c11a55 Mon Sep 17 00:00:00 2001 From: Francesco Mazzaschi Date: Fri, 11 Jul 2025 15:54:59 +0200 Subject: [PATCH 1/2] Add Lambda1405 to TDatabasePdg and O2MCApplication --- .../SimulationDataFormat/O2DatabasePDG.h | 9 ++++ Steer/src/O2MCApplication.cxx | 41 +++++++++++++++++++ 2 files changed, 50 insertions(+) diff --git a/DataFormats/simulation/include/SimulationDataFormat/O2DatabasePDG.h b/DataFormats/simulation/include/SimulationDataFormat/O2DatabasePDG.h index ec8e6db889167..23dc30119aa7a 100644 --- a/DataFormats/simulation/include/SimulationDataFormat/O2DatabasePDG.h +++ b/DataFormats/simulation/include/SimulationDataFormat/O2DatabasePDG.h @@ -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)) { diff --git a/Steer/src/O2MCApplication.cxx b/Steer/src/O2MCApplication.cxx index e44758241b8d2..4ff1e23c3c72d 100644 --- a/Steer/src/O2MCApplication.cxx +++ b/Steer/src/O2MCApplication.cxx @@ -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 @@ -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); From 05148ee4c03f9308f90fef1290cdc0927e40f8b5 Mon Sep 17 00:00:00 2001 From: ALICE Action Bot Date: Fri, 11 Jul 2025 13:56:46 +0000 Subject: [PATCH 2/2] Please consider the following formatting changes --- Steer/src/O2MCApplication.cxx | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) diff --git a/Steer/src/O2MCApplication.cxx b/Steer/src/O2MCApplication.cxx index 4ff1e23c3c72d..77b49ec9e2906 100644 --- a/Steer/src/O2MCApplication.cxx +++ b/Steer/src/O2MCApplication.cxx @@ -1394,13 +1394,13 @@ void addSpecialParticles() // 33.3 % sigma-pi+, sigma+pi-, sigma0pi0 bratio[0] = 33.3; mode[0][0] = 3112; // Sigma- - mode[0][1] = 211; // negative pion + mode[0][1] = 211; // negative pion bratio[1] = 33.3; mode[1][0] = 3222; // Sigma+ - mode[1][1] = -211; // positive pion + mode[1][1] = -211; // positive pion bratio[2] = 33.3; - mode[2][0] = 3212; // Sigma0 - mode[2][1] = 111; // neutral pion + 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++) { @@ -1412,13 +1412,13 @@ void addSpecialParticles() // 33.3 % sigma-pi-, sigma-pi+, sigma0pi0 abratio[0] = 33.3; amode[0][0] = -3112; // AntiSigma- - amode[0][1] = -211; // positive pion + amode[0][1] = -211; // positive pion abratio[1] = 33.3; amode[1][0] = -3222; // AntiSigma+ - amode[1][1] = 211; // negative pion + amode[1][1] = 211; // negative pion abratio[2] = 33.3; - amode[2][0] = -3212; // Sigma0 - amode[2][1] = 111; // negative pion + amode[2][0] = -3212; // Sigma0 + amode[2][1] = 111; // negative pion TVirtualMC::GetMC()->SetDecayMode(-102132, abratio, amode); // Anti-Lambda(1405) // Lambda1520/Lambda1520bar