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[PWGLF] Add new expression for angular correlation #11497

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Merged
skundu692 merged 2 commits into from
Jun 6, 2025
Merged

[PWGLF] Add new expression for angular correlation #11497

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a9fd8eb
add new expression for angular correlation
skundu692 Jun 6, 2025
ee3b326
Update taskLambdaSpinCorr.cxx
skundu692 Jun 6, 2025
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14 changes: 13 additions & 1 deletion PWGLF/Tasks/Strangeness/taskLambdaSpinCorr.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -61,6 +61,7 @@
Configurable<bool> cfgEvtRCTFlagCheckerLimitAcceptAsBad{"cfgEvtRCTFlagCheckerLimitAcceptAsBad", true, "Evt sel: RCT flag checker treat Limited Acceptance As Bad"};
} rctCut;
// mixing
Configurable<int> cosCalculation{"cosCalculation", 1, "cos calculation"};
Configurable<int> mixingCombination{"mixingCombination", 1, "mixing Combination"};
Configurable<bool> mixingEvSel{"mixingEvSel", false, "mixingEvSel"};
Configurable<int> cfgCutOccupancy{"cfgCutOccupancy", 2000, "Occupancy cut"};
Expand Down Expand Up @@ -281,8 +282,19 @@
auto proton1LambdaRF = boostLambda1ToCM(proton1pairCM);
auto proton2LambdaRF = boostLambda2ToCM(proton2pairCM);

double cosThetaDiff = proton1LambdaRF.Vect().Unit().Dot(proton2LambdaRF.Vect().Unit());
auto cosThetaDiff = -999.0;
if (cosCalculation == 0) {
cosThetaDiff = proton1LambdaRF.Vect().Unit().Dot(proton2LambdaRF.Vect().Unit());
}

if (cosCalculation == 1) {
ROOT::Math::XYZVector quantizationAxis = lambda1CM.Vect().Unit();
double cosTheta1 = proton1LambdaRF.Vect().Unit().Dot(quantizationAxis);
double cosTheta2 = proton2LambdaRF.Vect().Unit().Dot(quantizationAxis);
cosThetaDiff = cosTheta1 * cosTheta2;
}

double deltaR = TMath::Sqrt(TMath::Power(particle1.Eta() - particle2.Eta(), 2.0) + TMath::Power(particle1.Phi() - particle2.Phi(), 2.0));

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[root/entity] 

Replace ROOT entities with equivalents from standard C++ or from O2.
if (datatype == 0) {
if (tag1 && tag3) {
histos.fill(HIST("hSparseLambdaLambda"), particle1.M(), particle2.M(), cosThetaDiff, centrality, deltaR);
Expand Down Expand Up @@ -313,7 +325,7 @@
}
}

if (datatype == 2) {

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[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
if (tag1 && tag3) {
histos.fill(HIST("hSparseLambdaLambdaMixed"), particle1.M(), particle2.M(), cosThetaDiff, centrality, deltaR);
}
Expand Down Expand Up @@ -521,7 +533,7 @@
Preslice<aod::V0Datas> tracksPerCollisionV0 = aod::v0data::collisionId;
void processME(EventCandidates const& collisions, AllTrackCandidates const&, ResoV0s const& V0s)
{
for (auto& [collision1, collision2] : selfCombinations(colBinning, nMix, -1, collisions, collisions)) {

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[const-ref-in-for-loop] 

Use constant references for non-modified iterators in range-based for loops.
// LOGF(info, "Mixed event collisions: (%d, %d)", collision1.index(), collision2.index());
if (rctCut.requireRCTFlagChecker && !rctChecker(collision1)) {
continue;
Expand Down Expand Up @@ -588,7 +600,7 @@
size_t cols = groupV01.size() + 20;
std::vector<std::vector<bool>> pairStatus(rows, std::vector<bool>(cols, false));
histos.fill(HIST("hv0Mult"), groupV01.size());
for (auto& [t1, t2] : soa::combinations(o2::soa::CombinationsFullIndexPolicy(groupV01, groupV02))) {

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[const-ref-in-for-loop] 

Use constant references for non-modified iterators in range-based for loops.
bool pairfound = false;
if (t2.index() <= t1.index()) {
continue;
Expand Down Expand Up @@ -619,7 +631,7 @@
continue;
}
auto samePairSumPt = t1.pt() + t2.pt();
auto samePairR = TMath::Sqrt(TMath::Power(t1.phi() - t2.phi(), 2.0) + TMath::Power(t1.eta() - t2.eta(), 2.0));

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[root/entity] 

Replace ROOT entities with equivalents from standard C++ or from O2.
for (const auto& t3 : groupV03) {
// if (pairStatus[t3.index()][t2.index()]) {
// LOGF(info, "repeat match found v0 id: (%d, %d)", t3.index(), t2.index());
Expand Down Expand Up @@ -651,9 +663,9 @@
// continue;
// }
auto mixPairSumPt = t3.pt() + t2.pt();
auto mixPairR = TMath::Sqrt(TMath::Power(t3.phi() - t2.phi(), 2.0) + TMath::Power(t3.eta() - t2.eta(), 2.0));

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[root/entity] 

Replace ROOT entities with equivalents from standard C++ or from O2.
histos.fill(HIST("hPtDiff"), TMath::Abs(mixPairSumPt - samePairSumPt));

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[root/entity] 

Replace ROOT entities with equivalents from standard C++ or from O2.
histos.fill(HIST("hRDiff"), TMath::Abs(mixPairR - samePairR));

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[root/entity] 

Replace ROOT entities with equivalents from standard C++ or from O2.
if (mixingCombination == 0 && std::abs(t1.pt() - t3.pt()) > ptMix) {
continue;
}
Expand Down Expand Up @@ -798,7 +810,7 @@
// Processing Event Mixing MC
void processMEMC(CollisionMCRecTableCentFT0C const& collisions, TrackMCRecTable const&, V0TrackCandidatesMC const& V0s)
{
for (auto& [collision1, collision2] : selfCombinations(colBinning, nMix, -1, collisions, collisions)) {

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[const-ref-in-for-loop] 

Use constant references for non-modified iterators in range-based for loops.
// LOGF(info, "Mixed event collisions: (%d, %d)", collision1.index(), collision2.index());

if (collision1.index() == collision2.index()) {
Expand All @@ -825,7 +837,7 @@
continue;
}
bool pairStatus[1150][1150] = {{false}};
for (auto& [t1, t2] : soa::combinations(o2::soa::CombinationsFullIndexPolicy(groupV01, groupV02))) {

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[const-ref-in-for-loop] 

Use constant references for non-modified iterators in range-based for loops.
bool pairfound = false;
if (t2.index() <= t1.index()) {
continue;
Expand Down
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