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[PWGLF] added pt correction for he3 tracked as triton in the purity s… #14221

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Merged
maciacco merged 2 commits into from
Dec 16, 2025
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[PWGLF] added pt correction for he3 tracked as triton in the purity s… #14221

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[PWGLF] added pt correction for he3 tracked as triton in the purity s…
GiorgioAlbertoLucia Dec 15, 2025
b6831c7
Merge branch 'master' into li4
GiorgioAlbertoLucia Dec 15, 2025
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17 changes: 15 additions & 2 deletions PWGLF/TableProducer/Nuspex/he3HadronFemto.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 @@ -49,7 +49,7 @@
#include "Framework/runDataProcessing.h"
#include "ReconstructionDataFormats/Track.h"

#include <TDatabasePDG.h>

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[pdg/database] 

Do not use TDatabasePDG directly. Use o2::constants::physics::Mass... or Service<o2::framework::O2DatabasePDG> instead.
#include <TDirectory.h>
#include <TFile.h>
#include <TH1F.h>
Expand Down Expand Up @@ -129,6 +129,8 @@
{0.0021, 1.1122, 0.0021} // Pr
};

std::array<float, 2> kHePidTrkParams = {0.1593, -0.0445};

} // namespace

struct He3HadCandidate {
Expand Down Expand Up @@ -472,6 +474,15 @@
return true;
}

template <typename Ttrack>
float correctPtHe3TrackedAsTriton(const Ttrack& candidate)
{
if (candidate.pt() < 2.5 && candidate.pidForTracking() == o2::track::PID::Triton)

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[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
return candidate.pt() * 2. * (1. - kHePidTrkParams[0] - kHePidTrkParams[1] * candidate.pt() * 2.);

return candidate.pt() * 2.;
}

float computeNsigmaDCA(const float pt, const float dca, const int iSpecies, const char* dcaType = "xy")
{

Expand Down Expand Up @@ -636,7 +647,7 @@
std::array<float, 3> collisionVertex = getCollisionVertex(collisions, collIdx);
const auto& pca = mFitter.getPCACandidate();
float distance = defaultTodistance;
for (int i = 0; i < 3; i++) {

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[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
distance += (pca[i] - collisionVertex[i]) * (pca[i] - collisionVertex[i]);
}
if (distanceMin < 0 || distance < distanceMin) {
Expand All @@ -658,7 +669,7 @@
std::array<float, 3> collisionVertex = getCollisionVertex(collisions, he3Hadcand.collisionID);

he3Hadcand.momHe3 = std::array{trackHe3.px(), trackHe3.py(), trackHe3.pz()};
for (int i = 0; i < 3; i++)

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[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
he3Hadcand.momHe3[i] = he3Hadcand.momHe3[i] * 2;
he3Hadcand.momHad = std::array{trackHad.px(), trackHad.py(), trackHad.pz()};
float invMass = CommonInite;
Expand Down Expand Up @@ -1337,7 +1348,9 @@
if (!selectTrack(track, Species::kHe3) || !selectDcaNsigmaCut(track, Species::kHe3))
continue;

mQaRegistry.fill(HIST("He3/hHe3Pt"), track.pt() * 2.f);
const float ptHe3Corrected = correctPtHe3TrackedAsTriton(track);

mQaRegistry.fill(HIST("He3/hHe3Pt"), ptHe3Corrected);
mQaRegistry.fill(HIST("He3/hDCAxyHe3"), track.dcaXY());
mQaRegistry.fill(HIST("He3/hDCAzHe3"), track.dcaZ());

Expand All @@ -1348,7 +1361,7 @@
}

const float nSigmaHe3 = computeNSigmaHe3(track);
mQaRegistry.fill(HIST("He3/h2NsigmaHe3TPC_preselection"), track.sign() * 2 * track.pt(), nSigmaHe3);
mQaRegistry.fill(HIST("He3/h2NsigmaHe3TPC_preselection"), track.sign() * ptHe3Corrected, nSigmaHe3);
}
}
PROCESS_SWITCH(he3HadronFemto, processPurity, "Process for purity studies", false);
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