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Merged
chiarapinto merged 2 commits into from
Jun 5, 2023
Merged

Add bach-baryon cuts, tuning #2751

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fba233a
Add bach-baryon cuts, tuning
Jun 5, 2023
ca69342
Clang-format fixes
Jun 5, 2023
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7 changes: 7 additions & 0 deletions PWGLF/DataModel/LFStrangenessTables.h
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Original file line number Diff line number Diff line change
Expand Up @@ -334,6 +334,11 @@ DECLARE_SOA_COLUMN(DCAZCascToPV, dcaZCascToPV, float); //!
DECLARE_SOA_COLUMN(PositionCovMat, positionCovMat, float[6]); //! covariance matrix elements
DECLARE_SOA_COLUMN(MomentumCovMat, momentumCovMat, float[6]); //! covariance matrix elements

// Selection to avoid spurious invariant mass correlation
// bachelor-baryon cosine of pointing angle / DCA to PV
DECLARE_SOA_COLUMN(BachBaryonCosPA, bachBaryonCosPA, float); //! avoid bach-baryon correlated inv mass structure in analysis
DECLARE_SOA_COLUMN(BachBaryonDCAxyToPV, bachBaryonDCAxyToPV, float); //! avoid bach-baryon correlated inv mass structure in analysis

// Saved from strangeness tracking
DECLARE_SOA_COLUMN(MatchingChi2, matchingChi2, float); //!
DECLARE_SOA_COLUMN(TopologyChi2, topologyChi2, float); //!
Expand Down Expand Up @@ -401,6 +406,7 @@ DECLARE_SOA_TABLE(StoredCascDatas, "AOD", "CASCDATA", //!
cascdata::Px, cascdata::Py, cascdata::Pz,
cascdata::DCAV0Daughters, cascdata::DCACascDaughters,
cascdata::DCAPosToPV, cascdata::DCANegToPV, cascdata::DCABachToPV, cascdata::DCAXYCascToPV, cascdata::DCAZCascToPV,
cascdata::BachBaryonCosPA, cascdata::BachBaryonDCAxyToPV,

// Dynamic columns
cascdata::Pt<cascdata::Px, cascdata::Py>,
Expand Down Expand Up @@ -431,6 +437,7 @@ DECLARE_SOA_TABLE(StoredTraCascDatas, "AOD", "TRACASCDATA", //!
cascdata::Px, cascdata::Py, cascdata::Pz,
cascdata::DCAV0Daughters, cascdata::DCACascDaughters,
cascdata::DCAPosToPV, cascdata::DCANegToPV, cascdata::DCABachToPV, cascdata::DCAXYCascToPV, cascdata::DCAZCascToPV,
cascdata::BachBaryonCosPA, cascdata::BachBaryonDCAxyToPV,
cascdata::MatchingChi2, cascdata::TopologyChi2, cascdata::ItsClsSize,

// Dynamic columns
Expand Down
78 changes: 76 additions & 2 deletions PWGLF/TableProducer/cascadebuilder.cxx
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Expand Up @@ -124,6 +124,7 @@ struct cascadeBuilder {
Configurable<bool> d_GenerateOnlyTrackedCascades{"d_GenerateOnlyTrackedCascades", false, "Skip cascades that aren't tracked"};
Configurable<bool> d_QA_checkMC{"d_QA_checkMC", true, "check MC truth in QA"};
Configurable<bool> d_QA_checkdEdx{"d_QA_checkdEdx", false, "check dEdx in QA"};
Configurable<bool> calculateBachBaryonVars{"calculateBachBaryonVars", false, "calculate variables for removing cascade inv mass bump"};

// CCDB options
Configurable<std::string> ccdburl{"ccdb-url", "http://alice-ccdb.cern.ch", "url of the ccdb repository"};
Expand Down Expand Up @@ -196,6 +197,8 @@ struct cascadeBuilder {
float mOmega;
float yXi;
float yOmega;
float bachBaryonCosPA;
float bachBaryonDCAxyToPV;
} cascadecandidate;

o2::track::TrackParCov lBachelorTrack;
Expand Down Expand Up @@ -518,6 +521,10 @@ struct cascadeBuilder {
matCorrCascade = o2::base::Propagator::MatCorrType::USEMatCorrTGeo;
if (useMatCorrTypeCasc == 2)
matCorrCascade = o2::base::Propagator::MatCorrType::USEMatCorrLUT;

// initialize bach baryon variables just in case
cascadecandidate.bachBaryonCosPA = 1; // would ordinarily reject all
cascadecandidate.bachBaryonDCAxyToPV = 0; // would ordinarily reject all
}

void initCCDB(aod::BCsWithTimestamps::iterator const& bc)
Expand Down Expand Up @@ -568,6 +575,60 @@ struct cascadeBuilder {
}
}

template <typename TCollision, typename TTrack>
void processBachBaryonVariables(TCollision const& collision, TTrack const& track1, TTrack const& track2)
{
cascadecandidate.bachBaryonCosPA = 0; // would ordinarily accept all
cascadecandidate.bachBaryonDCAxyToPV = 1e+3; // would ordinarily accept all

// create tracks from table rows
o2::track::TrackParCov tr1 = getTrackParCov(track1);
o2::track::TrackParCov tr2 = getTrackParCov(track2);

//---/---/---/
// Move close to minima
int nCand = 0;
try {
nCand = fitter.process(tr1, tr2);
} catch (...) {
registry.fill(HIST("hCaughtExceptions"), 0.5f);
LOG(error) << "Exception caught in DCA fitter process call!";
return;
}
if (nCand == 0)
return; // variables are such that candidate is accepted (not obvious...)

// Calculate DCAxy of the cascade (with bending)
o2::track::TrackPar wrongV0 = fitter.createParentTrackPar();
wrongV0.setAbsCharge(0); // charge zero
gpu::gpustd::array<float, 2> dcaInfo;
dcaInfo[0] = 999;
dcaInfo[1] = 999;

// bachelor-baryon DCAxy to PV
o2::base::Propagator::Instance()->propagateToDCABxByBz({collision.posX(), collision.posY(), collision.posZ()}, wrongV0, 2.f, matCorr, &dcaInfo);
cascadecandidate.bachBaryonDCAxyToPV = dcaInfo[0];

const auto& vtx = fitter.getPCACandidate();
if (!fitter.isPropagateTracksToVertexDone())
return;

std::array<float, 3> tr1p;
std::array<float, 3> tr2p;

fitter.getTrack(1).getPxPyPzGlo(tr1p);
fitter.getTrack(2).getPxPyPzGlo(tr2p);

// bachelor-baryon CosPA
cascadecandidate.bachBaryonCosPA = RecoDecay::cpa(
array{collision.posX(), collision.posY(), collision.posZ()},
array{vtx[0], vtx[1], vtx[2]},
array{tr1p[0] + tr2p[0], tr1p[1] + tr2p[1], tr1p[2] + tr2p[2]});

// Potentially also to be considered: bachelor-baryon DCA (between the two tracks)
// to be added here as complementary information in the future
}

template <class TTrackTo, typename TCascObject>
bool buildCascadeCandidate(TCascObject const& cascade)
{
Expand All @@ -582,6 +643,16 @@ struct cascadeBuilder {
auto negTrack = v0.template negTrack_as<TTrackTo>();
auto const& collision = cascade.collision();

if (calculateBachBaryonVars) {
// Calculates properties of the V0 comprised of bachelor and baryon in the cascade
// baryon: distinguished via bachelor charge
if (bachTrack.sign() < 0) {
processBachBaryonVariables(collision, bachTrack, posTrack);
} else {
processBachBaryonVariables(collision, bachTrack, negTrack);
}
}

// value 0.5: any considered cascade
statisticsRegistry.cascstats[kCascAll]++;

Expand Down Expand Up @@ -785,7 +856,8 @@ struct cascadeBuilder {
cascadecandidate.bachP[2] + cascadecandidate.v0mompos[2] + cascadecandidate.v0momneg[2], // <--- redundant but ok
cascadecandidate.v0dcadau, cascadecandidate.dcacascdau,
cascadecandidate.v0dcapostopv, cascadecandidate.v0dcanegtopv,
cascadecandidate.bachDCAxy, cascadecandidate.cascDCAxy, cascadecandidate.cascDCAz); // <--- no corresponding stratrack information available
cascadecandidate.bachDCAxy, cascadecandidate.cascDCAxy, cascadecandidate.cascDCAz, // <--- no corresponding stratrack information available
cascadecandidate.bachBaryonCosPA, cascadecandidate.bachBaryonDCAxyToPV);

// populate cascade covariance matrices if required by any other task
if (createCascCovMats) {
Expand Down Expand Up @@ -853,7 +925,8 @@ struct cascadeBuilder {
cascadecandidate.bachP[2] + cascadecandidate.v0mompos[2] + cascadecandidate.v0momneg[2],
cascadecandidate.v0dcadau, cascadecandidate.dcacascdau,
cascadecandidate.v0dcapostopv, cascadecandidate.v0dcanegtopv,
cascadecandidate.bachDCAxy, cascadecandidate.cascDCAxy, cascadecandidate.cascDCAz);
cascadecandidate.bachDCAxy, cascadecandidate.cascDCAxy, cascadecandidate.cascDCAz,
cascadecandidate.bachBaryonCosPA, cascadecandidate.bachBaryonDCAxyToPV);

// populate cascade covariance matrices if required by any other task
if (createCascCovMats) {
Expand Down Expand Up @@ -1003,6 +1076,7 @@ struct cascadeBuilder {
cascadecandidate.v0dcadau, cascadecandidate.dcacascdau,
cascadecandidate.v0dcapostopv, cascadecandidate.v0dcanegtopv,
cascadecandidate.bachDCAxy, cascadecandidate.cascDCAxy, cascadecandidate.cascDCAz, // <--- stratrack (cascDCAxy/z)
cascadecandidate.bachBaryonCosPA, cascadecandidate.bachBaryonDCAxyToPV, // <--- anti-inv-mass structure
trackedCascade.matchingChi2(), trackedCascade.topologyChi2(), trackedCascade.itsClsSize()); // <--- stratrack fit info
}
}
Expand Down
4 changes: 2 additions & 2 deletions PWGLF/TableProducer/cascadefinder.cxx
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Expand Up @@ -267,7 +267,7 @@ struct cascadefinder {
v0.dcapostopv(),
v0.dcanegtopv(),
t0id.dcaXY(),
dcaInfo[0], dcaInfo[1]);
dcaInfo[0], dcaInfo[1], 0, 1e+3);
} // end if cascade recoed
} // end loop over bachelor
} // end if v0 recoed
Expand Down Expand Up @@ -357,7 +357,7 @@ struct cascadefinder {
v0.dcapostopv(),
v0.dcanegtopv(),
t0id.dcaXY(),
dcaInfo[0], dcaInfo[1]);
dcaInfo[0], dcaInfo[1], 0, 1e+3);
} // end if cascade recoed
} // end loop over bachelor
} // end if v0 recoed
Expand Down