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[PWGLF] Spincorr selection #16054

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skundu692 merged 2 commits into from
May 1, 2026
+108 −35
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[PWGLF] Spincorr selection #16054

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d0f1029
Fix Lambda spin correlation selection
skundu692 May 1, 2026
4d49cb7
Fix Lambda spin correlation selection
skundu692 May 1, 2026
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12 changes: 6 additions & 6 deletions PWGLF/TableProducer/Strangeness/lambdaspincorrelation.cxx
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
// Copyright 2019-2020 CERN and copyright holders of ALICE O2.

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[name/workflow-file] 

Name of a workflow file must match the name of the main struct in it (without the PWG prefix). (Class implementation files should be in "Core" directories.)
// See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.
// All rights not expressly granted are reserved.
//
Expand Down Expand Up @@ -74,7 +74,7 @@
ConfigurableAxis axisMultiplicityClass{"axisMultiplicityClass", {8, 0, 80}, "multiplicity percentile for bin"};

// events
Configurable<float> cfgEventTypepp{"cfgEventTypepp", true, "Type of collisions"};
Configurable<bool> cfgEventTypepp{"cfgEventTypepp", false, "Type of collisions"};
Configurable<float> cfgCutVertex{"cfgCutVertex", 10.0f, "Accepted z-vertex range"};
Configurable<float> cfgCutCentralityMax{"cfgCutCentralityMax", 80.0f, "Accepted maximum Centrality"};
Configurable<float> cfgCutCentralityMin{"cfgCutCentralityMin", 0.0f, "Accepted minimum Centrality"};
Expand Down Expand Up @@ -151,9 +151,9 @@
if (std::abs(ctauLambda) > cMaxV0LifeTime) {
return false;
}
if (std::abs(candidate.yLambda()) > confV0Rap) {
return false;
}
// if (std::abs(candidate.yLambda()) > confV0Rap) {
// return false;
// }
return true;
}

Expand Down Expand Up @@ -237,7 +237,7 @@
ROOT::Math::PxPyPzMVector lambdaDummy, pionDummy, protonDummy;

Filter collisionFilter = nabs(aod::collision::posZ) < cfgCutVertex;
Filter centralityFilter = (nabs(aod::cent::centFT0C) < cfgCutCentralityMax && nabs(aod::cent::centFT0C) > cfgCutCentralityMin);
// Filter centralityFilter = (nabs(aod::cent::centFT0C) < cfgCutCentralityMax && nabs(aod::cent::centFT0C) > cfgCutCentralityMin);

using EventCandidates = soa::Filtered<soa::Join<aod::Collisions, aod::EvSels, aod::CentFT0Cs, aod::CentFT0Ms>>;
using AllTrackCandidates = soa::Join<aod::Tracks, aod::TracksExtra, aod::TracksDCA, aod::TrackSelection, aod::pidTPCFullPi, aod::pidTPCFullPr>;
Expand Down Expand Up @@ -290,7 +290,7 @@
}
if (lambdaTag && aLambdaTag) {
doubleStatus.push_back(true);
if (std::abs(v0.mLambda() - 1.1154) < std::abs(v0.mAntiLambda() - 1.1154)) {
if (std::abs(v0.mLambda() - o2::constants::physics::MassLambda) < std::abs(v0.mAntiLambda() - o2::constants::physics::MassLambda)) {
lambdaTag = true;
aLambdaTag = false;
} else {
Expand Down Expand Up @@ -401,7 +401,7 @@
}
if (lambdaTag && aLambdaTag) {
doubleStatus.push_back(true);
if (std::abs(v0.mLambda() - 1.1154) < std::abs(v0.mAntiLambda() - 1.1154)) {

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[pdg/explicit-mass] 

Avoid hard-coded particle masses. Use o2::constants::physics::Mass... instead.
lambdaTag = true;
aLambdaTag = false;
} else {
Expand Down
131 changes: 102 additions & 29 deletions PWGLF/Tasks/Strangeness/lambdaspincorrderived.cxx
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Expand Up @@ -759,7 +759,8 @@
continue;
proton2 = ROOT::Math::PtEtaPhiMVector(v02.protonPt(), v02.protonEta(), v02.protonPhi(), o2::constants::physics::MassProton);
lambda2 = ROOT::Math::PtEtaPhiMVector(v02.lambdaPt(), v02.lambdaEta(), v02.lambdaPhi(), v02.lambdaMass());
histos.fill(HIST("deltaPhiSame"), RecoDecay::constrainAngle(v0.lambdaPhi() - v02.lambdaPhi(), -TMath::Pi(), harmonicDphi));
if ((v0.v0Status() == 0 && v02.v0Status() == 1) || (v0.v0Status() == 1 && v02.v0Status() == 0))
histos.fill(HIST("deltaPhiSame"), RecoDecay::constrainAngle(v0.lambdaPhi() - v02.lambdaPhi(), -TMath::Pi(), harmonicDphi));
// const int ptype = pairTypeCode(v0.v0Status(), v02.v0Status());
if (v0.v0Status() == 0 && v02.v0Status() == 0) {
fillHistograms(0, 0, lambda, lambda2, proton, proton2, 0, 1.0);
Expand All @@ -768,7 +769,7 @@
fillHistograms(0, 1, lambda, lambda2, proton, proton2, 0, 1.0);
}
if (v0.v0Status() == 1 && v02.v0Status() == 0) {
fillHistograms(1, 0, lambda, lambda2, proton, proton2, 0, 1.0);
fillHistograms(0, 1, lambda2, lambda, proton2, proton, 0, 1.0);
}
if (v0.v0Status() == 1 && v02.v0Status() == 1) {
fillHistograms(1, 1, lambda, lambda2, proton, proton2, 0, 1.0);
Expand Down Expand Up @@ -849,7 +850,7 @@
auto nBins = colBinning.getAllBinsCount();
std::vector<std::deque<std::pair<int, AllTrackCandidates>>> eventPools(nBins);

for (auto& collision1 : collisions) {

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[const-ref-in-for-loop] 

Use constant references for non-modified iterators in range-based for loops.
const int bin = colBinning.getBin(std::make_tuple(collision1.posz(), collision1.cent()));
if (bin < 0) {
continue;
Expand All @@ -866,7 +867,7 @@
continue;
}

for (auto& [t1, t2] : soa::combinations(o2::soa::CombinationsFullIndexPolicy(poolA, poolA))) {

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[const-ref-in-for-loop] 

Use constant references for non-modified iterators in range-based for loops.
if (!selectionV0(t1) || !selectionV0(t2)) {
continue;
}
Expand Down Expand Up @@ -910,7 +911,7 @@
int nRepl1 = 0;
int nRepl2 = 0;

for (auto& tX : poolB) {

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[const-ref-in-for-loop] 

Use constant references for non-modified iterators in range-based for loops.
if (!selectionV0(tX)) {
continue;
}
Expand Down Expand Up @@ -940,10 +941,10 @@

const float wBase = 1.0f / static_cast<float>(totalRepl);

for (auto& pv : usable) {

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[const-ref-in-for-loop] 

Use constant references for non-modified iterators in range-based for loops.
auto& poolB = *pv.pool;

for (auto& tX : poolB) {

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[const-ref-in-for-loop] 

Use constant references for non-modified iterators in range-based for loops.
if (!selectionV0(tX)) {
continue;
}
Expand Down Expand Up @@ -1301,11 +1302,18 @@
RecoDecay::constrainAngle(mcacc::lamPhi(v0) - mcacc::lamPhi(v02),
-TMath::Pi(), harmonicDphi));

// const int ptype = pairTypeCode(mcacc::v0Status(v0), mcacc::v0Status(v02));
// datatype=0 (same event)
fillHistograms(mcacc::v0Status(v0), mcacc::v0Status(v02),
lambda, lambda2, proton, proton2,
/*datatype=*/0, /*mixpairweight=*/1.0f);
const int s1 = mcacc::v0Status(v0);
const int s2 = mcacc::v0Status(v02);

if (s1 == 0 && s2 == 0) {
fillHistograms(0, 0, lambda, lambda2, proton, proton2, 0, 1.0f);
} else if (s1 == 0 && s2 == 1) {
fillHistograms(0, 1, lambda, lambda2, proton, proton2, 0, 1.0f);
} else if (s1 == 1 && s2 == 0) {
fillHistograms(0, 1, lambda2, lambda, proton2, proton, 0, 1.0f);
} else if (s1 == 1 && s2 == 1) {
fillHistograms(1, 1, lambda, lambda2, proton, proton2, 0, 1.0f);
}
}
}
}
Expand Down Expand Up @@ -1509,9 +1517,9 @@
auto collectFromBins = [&](const std::vector<int>& ptUseBins,
const std::vector<int>& etaUseBins,
const std::vector<int>& phiUseBins) {
for (int ptUse : ptUseBins) {

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[const-ref-in-for-loop] 

Use constant references for non-modified iterators in range-based for loops.
for (int etaUse : etaUseBins) {

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[const-ref-in-for-loop] 

Use constant references for non-modified iterators in range-based for loops.
for (int phiUse : phiUseBins) {

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[const-ref-in-for-loop] 

Use constant references for non-modified iterators in range-based for loops.
const auto& vec = buffer[linearKeyR(colBin, status, ptUse, etaUse, phiUse, mB, rB,
nStat, nPt, nEta, nPhi, nM, nR)];

Expand Down Expand Up @@ -1752,8 +1760,18 @@

const float meWeight = wSE;
const float dPhi = deltaPhiMinusPiToPi((float)lambda.Phi(), (float)lambda2.Phi());
histos.fill(HIST("deltaPhiMix"), dPhi, wSE);
fillHistograms(tX.v0Status(), t2.v0Status(), lambda, lambda2, proton, proton2, 1, meWeight, 1);
if ((tX.v0Status() == 0 && t2.v0Status() == 1) || (tX.v0Status() == 1 && t2.v0Status() == 0))
histos.fill(HIST("deltaPhiMix"), dPhi, wSE);
const int s1 = tX.v0Status();
const int s2 = t2.v0Status();

if (s1 == 0 && s2 == 1) {
fillHistograms(0, 1, lambda, lambda2, proton, proton2, 1, meWeight, 1);
} else if (s1 == 1 && s2 == 0) {
fillHistograms(0, 1, lambda2, lambda, proton2, proton, 1, meWeight, 2);
} else {
fillHistograms(s1, s2, lambda, lambda2, proton, proton2, 1, meWeight, 1);
}
}
}

Expand Down Expand Up @@ -1785,7 +1803,15 @@
const float meWeight = wSE;
const float dPhi = deltaPhiMinusPiToPi((float)lambda.Phi(), (float)lambda2.Phi());
histos.fill(HIST("deltaPhiMix"), dPhi, wSE);
fillHistograms(t1.v0Status(), tY.v0Status(), lambda, lambda2, proton, proton2, 1, meWeight, 2);
const int s1 = t1.v0Status();
const int s2 = tY.v0Status();
if (s1 == 0 && s2 == 1) {
fillHistograms(0, 1, lambda, lambda2, proton, proton2, 1, meWeight, 2);
} else if (s1 == 1 && s2 == 0) {
fillHistograms(0, 1, lambda2, lambda, proton2, proton, 1, meWeight, 1);
} else {
fillHistograms(s1, s2, lambda, lambda2, proton, proton2, 1, meWeight, 2);
}
}
}
}
Expand Down Expand Up @@ -1948,26 +1974,59 @@

collectFromBins(ptBins, etaBins, phiBins);

// 2) if exact bin does not give enough, top up from neighbors
// 2) if exact bin gives fewer than required matches, also search neighbors
const int targetMatches = (cfgV5MaxMatches.value > 0) ? cfgV5MaxMatches.value : 1;

if ((int)matches.size() < targetMatches) {
collectNeighborBinsClamp(ptB, nPt, nN_pt, ptBins);
collectNeighborBinsClamp(etaB, nEta, nN_eta, etaBins);
collectNeighborBinsPhi(phiB, nPhi, nN_phi, phiBins);
std::vector<int> ptBinsN, etaBinsN, phiBinsN;
collectNeighborBinsClamp(ptB, nPt, nN_pt, ptBinsN);
collectNeighborBinsClamp(etaB, nEta, nN_eta, etaBinsN);
collectNeighborBinsPhi(phiB, nPhi, nN_phi, phiBinsN);

collectFromBins(ptBins, etaBins, phiBins);
}
for (int ptUse : ptBinsN) {
for (int etaUse : etaBinsN) {
for (int phiUse : phiBinsN) {
if (ptUse == ptB && etaUse == etaB && phiUse == phiB) {
continue;
}

// if nothing found, then try neighboring bins
if (matches.empty()) {
collectNeighborBinsClamp(ptB, nPt, nN_pt, ptBins);
collectNeighborBinsClamp(etaB, nEta, nN_eta, etaBins);
collectNeighborBinsPhi(phiB, nPhi, nN_phi, phiBins);
const auto& vec = buffer[linearKeyR(colBin, status, ptUse, etaUse, phiUse, mB, rB,
nStat, nPt, nEta, nPhi, nM, nR)];

collectFromBins(ptBins, etaBins, phiBins);
}
for (auto const& bc : vec) {
if (bc.collisionIdx == curColIdx) {
continue;
}

auto tX = V0sMC.iteratorAt(static_cast<uint64_t>(bc.rowIndex));

if (!selectionV0MC(tX)) {
continue;
}
if (!checkKinematicsMC(tRep, tX)) {
continue;
}

if (tX.globalIndex() == tRep.globalIndex()) {
continue;
}
if (tX.globalIndex() == tKeep.globalIndex()) {
continue;
}

if (hasSharedDaughtersMC(tX, tKeep)) {
continue;
}
if (hasSharedDaughtersMC(tX, tRep)) {
continue;
}

matches.push_back(MatchRef{bc.collisionIdx, bc.rowIndex});
}
}
}
}
}
std::sort(matches.begin(), matches.end(),
[](auto const& a, auto const& b) {
return std::tie(a.collisionIdx, a.rowIndex) < std::tie(b.collisionIdx, b.rowIndex);
Expand Down Expand Up @@ -2124,9 +2183,16 @@
const float meWeight = wSE;
const float dPhi = deltaPhiMinusPiToPi((float)lX.Phi(), (float)l2.Phi());
histos.fill(HIST("deltaPhiMix"), dPhi, wSE);
fillHistograms(mcacc::v0Status(tX), mcacc::v0Status(t2),
lX, l2, pX, p2,
1, meWeight, 1);
const int s1 = mcacc::v0Status(tX);
const int s2 = mcacc::v0Status(t2);

if (s1 == 0 && s2 == 1) {
fillHistograms(0, 1, lX, l2, pX, p2, 1, meWeight, 1);
} else if (s1 == 1 && s2 == 0) {
fillHistograms(0, 1, l2, lX, p2, pX, 1, meWeight, 2);
} else {
fillHistograms(s1, s2, lX, l2, pX, p2, 1, meWeight, 1);
}
}
}
if (doMixLeg2 && nFill2 > 0) {
Expand Down Expand Up @@ -2162,9 +2228,16 @@
const float meWeight = wSE;
const float dPhi = deltaPhiMinusPiToPi((float)l1.Phi(), (float)lY.Phi());
histos.fill(HIST("deltaPhiMix"), dPhi, wSE);
fillHistograms(mcacc::v0Status(t1), mcacc::v0Status(tY),
l1, lY, p1, pY,
1, meWeight, 2);
const int s1 = mcacc::v0Status(t1);
const int s2 = mcacc::v0Status(tY);

if (s1 == 0 && s2 == 1) {
fillHistograms(0, 1, l1, lY, p1, pY, 1, meWeight, 2);
} else if (s1 == 1 && s2 == 0) {
fillHistograms(0, 1, lY, l1, pY, p1, 1, meWeight, 1);
} else {
fillHistograms(s1, s2, l1, lY, p1, pY, 1, meWeight, 2);
}
}
}
}
Expand Down
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