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[ALICE3] Use track updates instead of mc info for causality check in a3 strangeness #18269

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Merged
jesgum merged 1 commit into from
Oct 14, 2026
+5 −51
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[ALICE3] Use track updates instead of mc info for causality check in a3 strangeness #18269

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56 changes: 5 additions & 51 deletions ALICE3/TableProducer/alice3strangenessFinder.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -21,7 +21,6 @@

#include "PWGLF/DataModel/LFStrangenessTables.h"

#include "ALICE3/Core/GeometryContainer.h"
#include "ALICE3/Core/TrackUtilities.h"
#include "ALICE3/DataModel/OTFPIDTrk.h"
#include "ALICE3/DataModel/OTFRICH.h"
Expand All @@ -32,7 +31,6 @@
#include "Common/Core/trackUtilities.h"
#include "Common/DataModel/TrackSelectionTables.h"

#include <CCDB/BasicCCDBManager.h>
#include <CommonConstants/PhysicsConstants.h>
#include <DCAFitter/DCAFitterN.h>
#include <DetectorsBase/Propagator.h>
Expand Down Expand Up @@ -74,9 +72,6 @@ struct Alice3strangenessFinder {
SliceCache cache;

HistogramRegistry histos{"histos", {}, OutputObjHandlingPolicy::AnalysisObject};
Service<o2::ccdb::BasicCCDBManager> ccdb{};
o2::fastsim::GeometryContainer geoContainer;
std::vector<std::vector<float>> trackingLayers;

Produces<aod::V0CandidateIndices> v0CandidateIndices; // contains V0 candidate indices
Produces<aod::V0CandidateCores> v0CandidateCores; // contains V0 candidate core information
Expand Down Expand Up @@ -151,7 +146,6 @@ struct Alice3strangenessFinder {
o2::vertexing::DCAFitterN<2> fitter;
Service<o2::framework::O2DatabasePDG> pdgDB{};
static constexpr float ToMicrons = 1e+4;
static constexpr int LutConfig = 0; // todo

// partitions for v0/casc dau tracks
Partition<Alice3TracksACTS> positiveSecondaryTracksACTS =
Expand Down Expand Up @@ -199,7 +193,7 @@ struct Alice3strangenessFinder {
float dcaToPV{};
};

void init(InitContext& initContext)
void init(InitContext&)
{
// Initialization code here
fitter.setBz(magneticField);
Expand Down Expand Up @@ -280,30 +274,6 @@ struct Alice3strangenessFinder {
histos.add("Generated/hGeneratedAntiOmega", "hGeneratedAntiOmega", kTH2D, {{axisPt}, {axisEta}});
}

if (doprocessFindV0CandidateOTF) {
ccdb->setURL("http://alice-ccdb.cern.ch");
ccdb->setTimestamp(-1);
geoContainer.setCcdbManager(ccdb.operator->());
geoContainer.init(initContext);
const int nGeometries = geoContainer.getNumberOfConfigurations();
trackingLayers.resize(nGeometries);

for (int icfg = 0; icfg < nGeometries; ++icfg) {
auto globalConfiguration = geoContainer.getConfigurations(icfg);

for (const auto& [outerKey, innerMap] : globalConfiguration) {
if (outerKey.empty() || outerKey[0] != 'B') {
continue;
}

auto it = innerMap.find("r");
if (it != innerMap.end()) {
trackingLayers[icfg].push_back(std::stof(it->second));
}
}
}
}

if (buildCascade) {
histos.add("CascadeBuilding/hDcaBetweenDaus", "hDcaBetweenDaus", kTH1D, {{axisDCA}});
histos.add("CascadeBuilding/hXiMass", "", kTH1D, {axisXiMass});
Expand Down Expand Up @@ -374,19 +344,6 @@ struct Alice3strangenessFinder {
return returnValue;
}

template <typename TTrackType>
[[nodiscard]] float getFirstLayerHitRadius(const TTrackType& track, const std::vector<float>& layers)
{
const float trueRadius = std::hypot(track.x(), track.y());
for (const float layerRadius : layers) {
if (layerRadius >= trueRadius) {
return layerRadius;
}
}
static constexpr float OutsideALICE3 = 100.f;
return OutsideALICE3;
}

template <typename TTrackType>
bool buildDecayCandidateTwoBody(TTrackType const& t0, TTrackType const& t1, std::array<float, 3> vtx, Candidate& thisCandidate)
{
Expand Down Expand Up @@ -672,23 +629,20 @@ struct Alice3strangenessFinder {

const float radiusV0 = std::hypot(v0Cand.posSV[0], v0Cand.posSV[1]);
const float radiusCasc = std::hypot(cascCand.posSV[0], cascCand.posSV[1]);
const float posCausalityRadius = getFirstLayerHitRadius(posTrack, trackingLayers[LutConfig]);
const float negCausalityRadius = getFirstLayerHitRadius(negTrack, trackingLayers[LutConfig]);
const float bachCausalityRadius = getFirstLayerHitRadius(bachTrack, trackingLayers[LutConfig]);

if (posCausalityRadius < radiusV0) {
// tracks without update information (IU < 0) are not checked
if (posTrack.trackIU() > 0.f && posTrack.trackIU() < radiusV0) {
continue; // positive track hit a layer before v0 decayed
}

if (negCausalityRadius < radiusV0) {
if (negTrack.trackIU() > 0.f && negTrack.trackIU() < radiusV0) {
continue; // negative track hit a layer before v0 decayed
}

if (radiusV0 < radiusCasc) {
continue; // v0 decayed before cascade
}

if (bachCausalityRadius < radiusCasc) {
if (bachTrack.trackIU() > 0.f && bachTrack.trackIU() < radiusCasc) {
continue; // bachelor track hit a layer before v0 decayed
}

Expand Down
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