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Merged
njacazio merged 3 commits into from
Apr 30, 2025
Merged

[ALICE3] Add additional selections with corresponding QA histograms #11038

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fcec57b
More multi-charm selections
jesgum Apr 30, 2025
3d69764
Fix typo
jesgum Apr 30, 2025
0e657ee
formatting
jesgum Apr 30, 2025
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110 changes: 89 additions & 21 deletions ALICE3/TableProducer/alice3-multicharm.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -69,7 +69,7 @@
using labeledTracks = soa::Join<aod::Tracks, aod::McTrackLabels>;
using tofTracks = soa::Join<aod::Tracks, aod::UpgradeTofs>;
using richTracks = soa::Join<aod::Tracks, aod::RICHs>;
using alice3tracks = soa::Join<aod::Tracks, aod::TracksCov, aod::Alice3DecayMaps, aod::McTrackLabels, aod::TracksDCA, aod::TracksExtraA3>;
using alice3tracks = soa::Join<aod::Tracks, aod::TracksCov, aod::Alice3DecayMaps, aod::McTrackLabels, aod::TracksDCA, aod::TracksExtraA3, aod::UpgradeTofs, aod::UpgradeTofExpectedTimes>;

struct alice3multicharm {
SliceCache cache;
Expand All @@ -89,6 +89,8 @@
Configurable<float> piFromXiC_dcaZconstant{"piFromXiC_dcaZconstant", 0.001f, "[0] in |DCAxy| > [0]+[1]/pT"};
Configurable<float> piFromXiC_dcaXYpTdep{"piFromXiC_dcaXYpTdep", 0.0, "[1] in |DCAxy| > [0]+[1]/pT"};
Configurable<float> piFromXiC_dcaZpTdep{"piFromXiC_dcaZpTdep", 0.0, "[1] in |DCAxy| > [0]+[1]/pT"};
Configurable<float> piFromXiC_tofDiffInner{"piFromXiC_tofDiffInner", 50, "|signal - expected| (ps)"};
Configurable<float> piFromXiCC_tofDiffInner{"piFromXiCC_tofDiffInner", 50, "|signal - expected| (ps)"};
Configurable<float> piFromXiCC_dcaXYconstant{"piFromXiCC_dcaXYconstant", 0.001f, "[0] in |DCAxy| > [0]+[1]/pT"};
Configurable<float> piFromXiCC_dcaZconstant{"piFromXiCC_dcaZconstant", 0.001f, "[0] in |DCAxy| > [0]+[1]/pT"};
Configurable<float> piFromXiCC_dcaXYpTdep{"piFromXiCC_dcaXYpTdep", 0.0, "[1] in |DCAxy| > [0]+[1]/pT"};
Expand All @@ -107,21 +109,27 @@
Configurable<float> minPiCCPt{"minPiCCPt", 0.3, "Minimum pT for XiCC pions"};
Configurable<float> minNTracks{"minNTracks", -1, "Minimum number of tracks"};

Configurable<float> minXiRadius{"minXiRadius", 0.5, "Minimum R2D for XiC decay (cm)"};
Configurable<float> minXiCRadius{"minXiCRadius", 0.001, "Minimum R2D for XiC decay (cm)"};
Configurable<float> minXiCCRadius{"minXiCCRadius", 0.005, "Minimum R2D for XiCC decay (cm)"};
Configurable<float> xicMinDecayDistanceFromPV{"xicMinDecayDistanceFromPV", 0.002, "Minimum distance for XiC decay from PV (cm)"};
Configurable<float> xicMinProperLength{"xicMinProperLength", 0.002, "Minimum proper length for XiC decay (cm)"};
Configurable<float> xicMaxProperLength{"xicMaxProperLength", 0.06, "Minimum proper length for XiC decay (cm)"};
Configurable<float> xiccMinProperLength{"xiccMinProperLength", 0.004, "Minimum proper length for XiCC decay (cm)"};
Configurable<float> xiccMaxProperLength{"xiccMaxProperLength", 999, "Minimum proper length for XiCC decay (cm)"};
Configurable<float> massWindowXi{"massWindowXi", 0.015, "Mass window around Xi peak"};
Configurable<float> massWindowXiC{"massWindowXiC", 0.015, "Mass window around XiC peak"};
Configurable<float> xiccMaxEta{"xiccMaxEta", 1.5, "Max eta"};
Configurable<float> massWindowXi{"massWindowXi", 0.015, "Mass window around Xi peak (GeV/c)"};
Configurable<float> massWindowXiC{"massWindowXiC", 0.015, "Mass window around XiC peak (GeV/c)"};

ConfigurableAxis axisEta{"axisEta", {80, -4.0f, +4.0f}, "#eta"};
ConfigurableAxis axisPt{"axisPt", {VARIABLE_WIDTH, 0.0f, 0.1f, 0.2f, 0.3f, 0.4f, 0.5f, 0.6f, 0.7f, 0.8f, 0.9f, 1.0f, 1.1f, 1.2f, 1.3f, 1.4f, 1.5f, 1.6f, 1.7f, 1.8f, 1.9f, 2.0f, 2.2f, 2.4f, 2.6f, 2.8f, 3.0f, 3.2f, 3.4f, 3.6f, 3.8f, 4.0f, 4.4f, 4.8f, 5.2f, 5.6f, 6.0f, 6.5f, 7.0f, 7.5f, 8.0f, 9.0f, 10.0f, 11.0f, 12.0f, 13.0f, 14.0f, 15.0f, 17.0f, 19.0f, 21.0f, 23.0f, 25.0f, 30.0f, 35.0f, 40.0f, 50.0f}, "pt axis for QA histograms"};
ConfigurableAxis axisDCA2d{"axisDCA2d", {400, -200, 200}, "DCA2d (#mum)"};
ConfigurableAxis axisDCA{"axisDCA", {200, 0, 200}, "DCA (#mum)"};
ConfigurableAxis axisRadius{"axisRadius", {1000, 0, 1000}, "Decay radius (#mum)"};
ConfigurableAxis axisDCA2D{"axisDCA2D", {400, -200, 200}, "DCA2d (#mum)"};
ConfigurableAxis axisDCA{"axisDCA", {400, 0, 400}, "DCA (#mum)"};
ConfigurableAxis axisRadius{"axisRadius", {10000, 0, 10000}, "Decay radius (#mum)"};
ConfigurableAxis axisRadius2D{"axisRadius2D", {1000, 0, 100000}, "Decay radius (#mum)"};
ConfigurableAxis axisRadius2DXi{"axisRadius2DXi", {1000, 0, 20}, "Decay radius (cm)"};
ConfigurableAxis axisDecayLength{"axisDecayLength", {2000, 0, 2000}, "Decay lenght (#mum)"};
ConfigurableAxis axisTOFTrack{"axisTOFTrack", {1000, 0, 5000}, "TOF track time"};

ConfigurableAxis axisXiMass{"axisXiMass", {200, 1.221f, 1.421f}, "Xi Inv Mass (GeV/c^{2})"};
ConfigurableAxis axisXiCMass{"axisXiCMass", {200, 2.368f, 2.568f}, "XiC Inv Mass (GeV/c^{2})"};
Expand All @@ -137,9 +145,9 @@

HistogramRegistry histos{"histos", {}, OutputObjHandlingPolicy::AnalysisObject};

Partition<aod::McParticles> trueXi = aod::mcparticle::pdgCode == 3312;

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[pdg/explicit-code] 

Avoid hard-coded PDG codes. Use named values from PDG_t or o2::constants::physics::Pdg instead.
Partition<aod::McParticles> trueXiC = aod::mcparticle::pdgCode == 4232;

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[pdg/explicit-code] 

Avoid hard-coded PDG codes. Use named values from PDG_t or o2::constants::physics::Pdg instead.
Partition<aod::McParticles> trueXiCC = aod::mcparticle::pdgCode == 4422;

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[pdg/explicit-code] 

Avoid hard-coded PDG codes. Use named values from PDG_t or o2::constants::physics::Pdg instead.

// filter expressions for D mesons
static constexpr uint32_t trackSelectionPiFromXiC = 1 << kInnerTOFPion | 1 << kOuterTOFPion | 1 << kRICHPion | 1 << kTruePiFromXiC;
Expand Down Expand Up @@ -233,14 +241,14 @@
thisXiCCcandidate.parentTrackCovMatrix[5] = covVtx(2, 2);

// set relevant values
thisXiCCcandidate.dca = TMath::Sqrt(fitter.getChi2AtPCACandidate());

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[root/entity] 

Replace ROOT entities with equivalents from standard C++ or from O2.
if (thisXiCCcandidate.dca > dcaXiCCDaughtersSelection) {
return false;
}

thisXiCCcandidate.mass = RecoDecay::m(array{array{thisXiCCcandidate.prong0mom[0], thisXiCCcandidate.prong0mom[1], thisXiCCcandidate.prong0mom[2]}, array{thisXiCCcandidate.prong1mom[0], thisXiCCcandidate.prong1mom[1], thisXiCCcandidate.prong1mom[2]}}, array{mass0, mass1});

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[std-prefix] 

Use std:: prefix for names from the std namespace.
thisXiCCcandidate.pt = std::hypot(thisXiCCcandidate.prong0mom[0] + thisXiCCcandidate.prong1mom[0], thisXiCCcandidate.prong0mom[1] + thisXiCCcandidate.prong1mom[1]);
thisXiCCcandidate.eta = RecoDecay::eta(array{thisXiCCcandidate.prong0mom[0] + thisXiCCcandidate.prong1mom[0], thisXiCCcandidate.prong0mom[1] + thisXiCCcandidate.prong1mom[1], thisXiCCcandidate.prong0mom[2] + thisXiCCcandidate.prong1mom[2]});

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[std-prefix] 

Use std:: prefix for names from the std namespace.
return true;
}

Expand Down Expand Up @@ -303,13 +311,13 @@
thisXiCcandidate.parentTrackCovMatrix[5] = covVtx(2, 2);

// set relevant values
thisXiCcandidate.dca = TMath::Sqrt(fitter3.getChi2AtPCACandidate());

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[root/entity] 

Replace ROOT entities with equivalents from standard C++ or from O2.
if (thisXiCcandidate.dca > dcaXiCDaughtersSelection) {
return false;
}
thisXiCcandidate.mass = RecoDecay::m(array{array{thisXiCcandidate.prong0mom[0], thisXiCcandidate.prong0mom[1], thisXiCcandidate.prong0mom[2]}, array{thisXiCcandidate.prong1mom[0], thisXiCcandidate.prong1mom[1], thisXiCcandidate.prong1mom[2]}, array{thisXiCcandidate.prong2mom[0], thisXiCcandidate.prong2mom[1], thisXiCcandidate.prong2mom[2]}}, array{p0mass, p1mass, p2mass});

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[std-prefix] 

Use std:: prefix for names from the std namespace.
thisXiCcandidate.pt = std::hypot(thisXiCcandidate.prong0mom[0] + thisXiCcandidate.prong1mom[0] + thisXiCcandidate.prong2mom[0], thisXiCcandidate.prong0mom[1] + thisXiCcandidate.prong1mom[1] + thisXiCcandidate.prong2mom[1]);
thisXiCcandidate.eta = RecoDecay::eta(array{thisXiCcandidate.prong0mom[0] + thisXiCcandidate.prong1mom[0] + thisXiCcandidate.prong2mom[0], thisXiCcandidate.prong0mom[1] + thisXiCcandidate.prong1mom[1] + thisXiCcandidate.prong2mom[1], thisXiCcandidate.prong0mom[2] + thisXiCcandidate.prong1mom[2] + thisXiCcandidate.prong2mom[2]});

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[std-prefix] 

Use std:: prefix for names from the std namespace.
return true;
}

Expand All @@ -324,7 +332,7 @@
auto mcParticle1 = track1.template mcParticle_as<aod::McParticles>();
auto mcParticle2 = track2.template mcParticle_as<aod::McParticles>();
if (mcParticle1.has_mothers() && mcParticle2.has_mothers()) {
for (auto& mcParticleMother1 : mcParticle1.template mothers_as<aod::McParticles>()) {

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[const-ref-in-for-loop] 

Use constant references for non-modified iterators in range-based for loops.
for (auto& mcParticleMother2 : mcParticle2.template mothers_as<aod::McParticles>()) {
if (mcParticleMother1.globalIndex() == mcParticleMother2.globalIndex()) {
returnValue = true;
Expand Down Expand Up @@ -421,12 +429,21 @@
histos.add("hPi2cPt", "hPi2cPt", kTH1D, {axisPt});
histos.add("hPiccPt", "hPiccPt", kTH1D, {axisPt});

histos.add("hMinXiDecayRadius", "hMinXiDecayRadius", kTH1D, {axisRadius2DXi});
histos.add("hMinXiCDecayRadius", "hMinXiCDecayRadius", kTH1D, {axisRadius});
histos.add("hMinXiCCDecayRadius", "hMinXiCCDecayRadius", kTH1D, {axisRadius});

histos.add("hMinxicDecayDistanceFromPV", "hMinxicDecayDistanceFromPV", kTH1D, {axisDecayLength});
histos.add("hProperLengthXiC", "hProperLengthXiC", kTH1D, {axisDecayLength});
histos.add("hProperLengthXiCC", "hProperLengthXiCC", kTH1D, {axisDecayLength});

histos.add("hInnerTOFTrackTimeRecoPi1c", "hInnerTOFTrackTimeRecoPi1c", kTH1D, {axisTOFTrack});
histos.add("hInnerTOFTrackTimeRecoPi2c", "hInnerTOFTrackTimeRecoPi2c", kTH1D, {axisTOFTrack});
histos.add("hInnerTOFTrackTimeRecoPicc", "hInnerTOFTrackTimeRecoPicc", kTH1D, {axisTOFTrack});

histos.add("hXiRadiusVsXicRadius", "hXiRadiusVsXicRadius", kTH2D, {axisRadius2D, axisRadius2D});
histos.add("hXicRadiusVsXiccRadius", "hXicRadiusVsXiccRadius", kTH2D, {axisRadius2D, axisRadius2D});

// These histograms bookkeep the exact number of combinations attempted
// CombinationsXiC: triplets Xi-pi-pi considered per Xi
// CombinationsXiCC: doublets XiC-pi considered per XiC
Expand All @@ -436,9 +453,9 @@
histos.add("hNTracks", "hNTracks", kTH1D, {{20000, 0, 20000}});

if (doDCAplots) {
histos.add("h2dDCAxyVsPtXiFromXiC", "h2dDCAxyVsPtXiFromXiC", kTH2D, {axisPt, axisDCA2d});
histos.add("h2dDCAxyVsPtPiFromXiC", "h2dDCAxyVsPtPiFromXiC", kTH2D, {axisPt, axisDCA2d});
histos.add("h2dDCAxyVsPtPiFromXiCC", "h2dDCAxyVsPtPiFromXiCC", kTH2D, {axisPt, axisDCA2d});
histos.add("h2dDCAxyVsPtXiFromXiC", "h2dDCAxyVsPtXiFromXiC", kTH2D, {axisPt, axisDCA2D});
histos.add("h2dDCAxyVsPtPiFromXiC", "h2dDCAxyVsPtPiFromXiC", kTH2D, {axisPt, axisDCA2D});
histos.add("h2dDCAxyVsPtPiFromXiCC", "h2dDCAxyVsPtPiFromXiCC", kTH2D, {axisPt, axisDCA2D});
}
}

Expand Down Expand Up @@ -503,6 +520,9 @@
continue;

if (std::fabs(xi.dcaXY()) < xiFromXiC_dcaXYconstant || std::fabs(xi.dcaZ()) < xiFromXiC_dcaZconstant)
continue; // likely a primary xi

if (xiCand.cascRadius() < minXiRadius)
continue;

for (auto const& pi1c : tracksPiFromXiCgrouped) {
Expand All @@ -511,19 +531,29 @@
if (xiCand.posTrackId() == pi1c.globalIndex() || xiCand.negTrackId() == pi1c.globalIndex() || xiCand.bachTrackId() == pi1c.globalIndex())
continue; // avoid using any track that was already used
if (pi1c.pt() < minPiCPt)
continue;
continue; // too low momentum

double pi1cTOFDiffInner = std::fabs(pi1c.innerTOFTrackTimeReco() - pi1c.innerTOFExpectedTimePi());
if (pi1cTOFDiffInner > piFromXiC_tofDiffInner)
continue; // did not arrive at expected time

// second pion from XiC decay for starts here
for (auto const& pi2c : tracksPiFromXiCgrouped) {

if (mcSameMotherCheck && !checkSameMother(xi, pi2c))
continue; // keep only if same mother

if (pi1c.globalIndex() >= pi2c.globalIndex())
continue; // avoid same-mother, avoid double-counting

if (xiCand.posTrackId() == pi2c.globalIndex() || xiCand.negTrackId() == pi2c.globalIndex() || xiCand.bachTrackId() == pi2c.globalIndex())
continue; // avoid using any track that was already used

if (pi2c.pt() < minPiCPt)
continue;
continue; // too low momentum

double pi2cTOFDiffInner = std::fabs(pi2c.innerTOFTrackTimeReco() - pi2c.innerTOFExpectedTimePi());
if (pi2cTOFDiffInner > piFromXiC_tofDiffInner)
continue; // did not arrive at expected time

// if I am here, it means this is a triplet to be considered for XiC vertexing.
// will now attempt to build a three-body decay candidate with these three track rows.
Expand All @@ -535,6 +565,7 @@

if (std::fabs(thisXiCcandidate.mass - o2::constants::physics::MassXiCPlus) > massWindowXiC)
continue; // out of mass region

histos.fill(HIST("hCharmBuilding"), 1.0f);

const std::array<float, 3> momentumC = {
Expand All @@ -547,9 +578,12 @@
if (xicDecayRadius2D < minXiCRadius)
continue; // do not take if radius too small, likely a primary combination

histos.fill(HIST("hXiRadiusVsXicRadius"), xiCand.cascRadius() * 1e+4, xicDecayRadius2D * 1e+4);
if (xicDecayRadius2D > xiCand.cascRadius())
continue;

o2::dataformats::DCA dcaInfo;
float xicdcaXY = 1e+10, xicdcaZ = 1e+10;
;
o2::track::TrackParCov xicTrackCopy(xicTrack); // paranoia
o2::vertexing::PVertex primaryVertex;
primaryVertex.setXYZ(collision.posX(), collision.posY(), collision.posZ());
Expand All @@ -560,7 +594,7 @@
}

if (std::fabs(xicdcaXY) < xiCFromXiCC_dcaXY || std::fabs(xicdcaZ) < xiCFromXiCC_dcaZ)
continue;
continue; // likely a primary xic

histos.fill(HIST("hMassXiC"), thisXiCcandidate.mass);

Expand All @@ -569,10 +603,16 @@
for (auto const& picc : tracksPiFromXiCCgrouped) {
if (mcSameMotherCheck && !checkSameMotherExtra(xi, picc))
continue;

if (xiCand.posTrackId() == picc.globalIndex() || xiCand.negTrackId() == picc.globalIndex() || xiCand.bachTrackId() == picc.globalIndex())
continue; // avoid using any track that was already used

if (picc.pt() < minPiCCPt)
continue;
continue; // too low momentum

double piccTOFDiffInner = std::fabs(picc.innerTOFTrackTimeReco() - picc.innerTOFExpectedTimePi());
if (piccTOFDiffInner > piFromXiCC_tofDiffInner)
continue; // did not arrive at expected time

o2::track::TrackParCov piccTrack = getTrackParCov(picc);
nCombinationsCC++;
Expand All @@ -591,14 +631,34 @@
continue; // do not take if radius too small, likely a primary combination

double totalMomentumC = std::hypot(momentumC[0], momentumC[1], momentumC[2]);
double xicProperLength = std::fabs(std::hypot(thisXiCcandidate.xyz[0], thisXiCcandidate.xyz[1], thisXiCcandidate.xyz[2]) - std::hypot(thisXiCCcandidate.xyz[0], thisXiCCcandidate.xyz[1], thisXiCCcandidate.xyz[2]) * totalMomentumC) / (std::fabs(totalMomentumC) * thisXiCcandidate.mass);
double decayLengthXiC = std::hypot(
thisXiCcandidate.xyz[0] - thisXiCCcandidate.xyz[0],
thisXiCcandidate.xyz[1] - thisXiCCcandidate.xyz[1],
thisXiCcandidate.xyz[2] - thisXiCCcandidate.xyz[2]);
double xicProperLength = decayLengthXiC * thisXiCcandidate.mass / totalMomentumC;
if (xicProperLength < xicMinProperLength || xicProperLength > xicMaxProperLength)
continue;
continue; // likely background

double xicDistanceFromPV = std::hypot(
thisXiCcandidate.xyz[0] - collision.posX(),
thisXiCcandidate.xyz[1] - collision.posY(),
thisXiCcandidate.xyz[2] - collision.posZ());
double xicDecayDistanceFromPV = xicDistanceFromPV * thisXiCcandidate.mass / totalMomentumC;
if (xicDecayDistanceFromPV < xicMinDecayDistanceFromPV)
continue; // too close to PV

double totalMomentumCC = std::hypot(momentumCC[0], momentumCC[1], momentumCC[2]);
double xiccProperLength = std::fabs(std::hypot(collision.posX(), collision.posY(), collision.posZ()) - std::hypot(thisXiCCcandidate.xyz[0], thisXiCCcandidate.xyz[1], thisXiCCcandidate.xyz[2]) * totalMomentumCC) / (std::fabs(totalMomentumCC) * thisXiCCcandidate.mass);
double decayLengthXiCC = std::hypot(
thisXiCCcandidate.xyz[0] - collision.posX(),
thisXiCCcandidate.xyz[1] - collision.posY(),
thisXiCCcandidate.xyz[2] - collision.posZ());
double xiccProperLength = decayLengthXiCC * thisXiCCcandidate.mass / totalMomentumCC;
if (xiccProperLength < xiccMinProperLength || xiccProperLength > xicMaxProperLength)
continue;
continue; // likely background

histos.fill(HIST("hXicRadiusVsXiccRadius"), xicDecayRadius2D * 1e+4, xiccDecayRadius2D * 1e+4);
if (xiccDecayRadius2D > xicDecayRadius2D)
continue; // XiCC should decay before XiC

float xiccdcaXY = 1e+10, xiccdcaZ = 1e+10;
if (xiccTrack.propagateToDCA(primaryVertex, magneticField, &dcaInfo)) {
Expand All @@ -607,16 +667,24 @@
}

if (std::fabs(xiccdcaXY) > xiCC_dcaXY || std::fabs(xiccdcaZ) > xiCC_dcaZ)
continue;
continue; // not pointing to PV

if (std::fabs(thisXiCcandidate.eta) > xiccMaxEta)
continue; // not in central barrel

histos.fill(HIST("hMinxicDecayDistanceFromPV"), xicDecayDistanceFromPV * 1e+4);
histos.fill(HIST("hInnerTOFTrackTimeRecoPi1c"), pi1cTOFDiffInner);
histos.fill(HIST("hInnerTOFTrackTimeRecoPi2c"), pi2cTOFDiffInner);
histos.fill(HIST("hInnerTOFTrackTimeRecoPicc"), piccTOFDiffInner);
histos.fill(HIST("hDCAXiCDaughters"), thisXiCcandidate.dca * 1e+4);
histos.fill(HIST("hDCAXiCCDaughters"), thisXiCCcandidate.dca * 1e+4);
histos.fill(HIST("hProperLengthXiCC"), xiccProperLength * 1e+4);
histos.fill(HIST("hProperLengthXiC"), xicProperLength * 1e+4);
histos.fill(HIST("hMinXiCCDecayRadius"), xiccDecayRadius2D * 1e+4);
histos.fill(HIST("hMinXiCDecayRadius"), xicDecayRadius2D * 1e+4);
histos.fill(HIST("hPi2cPt"), pi2c.pt());
histos.fill(HIST("hMinXiDecayRadius"), xiCand.cascRadius());
histos.fill(HIST("hPi1cPt"), pi1c.pt());
histos.fill(HIST("hPi2cPt"), pi2c.pt());
histos.fill(HIST("hPiccPt"), picc.pt());
histos.fill(HIST("hDCAxyXi"), std::fabs(xi.dcaXY() * 1e+4));
histos.fill(HIST("hDCAzXi"), std::fabs(xi.dcaZ() * 1e+4));
Expand Down
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