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[PWGCF] Add pair-wise kstar histograms to the triplet hist manager #17044

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ariedel-cern merged 2 commits into from
Jul 13, 2026
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[PWGCF] Add pair-wise kstar histograms to the triplet hist manager #17044

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cdd552f
Feat: add pair-wise kstar histograms to triplet hist manager
ariedel-cern Jul 13, 2026
1d834cf
Fix: add missing include
ariedel-cern Jul 13, 2026
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52 changes: 52 additions & 0 deletions PWGCF/Femto/Core/tripletHistManager.h
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,7 @@
#include <Math/Vector4D.h> // IWYU pragma: keep (do not replace with Math/Vector4Dfwd.h)
#include <Math/Vector4Dfwd.h>

#include <algorithm>
#include <array>
#include <cmath>
#include <cstdint>
Expand All @@ -44,6 +45,10 @@ enum TripletHist {
// standard 1D
kQ3,
kMt, // averate mt of all pairs in the triplet
// kstar betweeen single particles
kKstar12,
kKstar13,
kKstar23,
// standard 2D
kPt1VsQ3,
kPt2VsQ3,
Expand Down Expand Up @@ -106,13 +111,15 @@ struct ConfTripletBinning : o2::framework::ConfigurableGroup {
std::string prefix = std::string("TripletBinning");
o2::framework::Configurable<bool> plot1D{"plot1D", true, "Enable 1D histograms"};
o2::framework::Configurable<bool> plot2D{"plot2D", true, "Enable 2D histograms"};
o2::framework::Configurable<bool> plotKstar{"plotKstar", false, "Enable kstar histograms"};
o2::framework::Configurable<bool> plotPt1VsPt2VsPt3{"plotPt1VsPt2VsPt3", false, "Enable 3D histogram (Pt1 vs Pt2 vs Pt3)"};
o2::framework::Configurable<bool> plotQ3VsPt1VsPt2VsPt3{"plotQ3VsPt1VsPt2VsPt3", false, "Enable 4D histogram (Q3 vs Pt1 vs Pt2 vs Pt3)"};
o2::framework::Configurable<bool> plotQ3VsMtVsMult{"plotQ3VsMtVsMult", false, "Enable 3D histogram (Q3 vs Mt vs Mult)"};
o2::framework::Configurable<bool> plotQ3VsMtVsMultVsCent{"plotQ3VsMtVsMultVsCent", false, "Enable 4D histogram (Q3 vs Mt vs Mult Vs Cent)"};
o2::framework::Configurable<bool> plotQ3VsMtVsPt1VsPt2VsPt3VsMult{"plotQ3VsMtVsPt1VsPt2VsPt3VsMult", false, "Enable 6D histogram (Q3 vs Mt Vs Pt1 vs Pt2 vs Pt3 vs Mult)"};
o2::framework::Configurable<bool> plotQ3VsMtVsPt1VsPt2VsPt3VsMultVsCent{"plotQ3VsMtVsPt1VsPt2VsPt3VsMultVsCent", false, "Enable 7D histogram (Q3 vs Mt Vs Pt1 vs Pt2 vs Pt3 vs Mult vs Cent)"};
o2::framework::ConfigurableAxis q3{"q3", {{600, 0, 6}}, "q3"};
o2::framework::ConfigurableAxis kstar{"kstar", {{600, 0, 6}}, "kstar (between pairs of particles)"};
o2::framework::ConfigurableAxis mt{"mt", {{500, 0.8, 5.8}}, "mt"};
o2::framework::ConfigurableAxis multiplicity{"multiplicity", {{50, 0, 200}}, "multiplicity"};
o2::framework::ConfigurableAxis centrality{"centrality", {{10, 0, 100}}, "centrality (mult. percentile)"};
Expand Down Expand Up @@ -142,6 +149,9 @@ constexpr std::array<histmanager::HistInfo<TripletHist>, kTripletHistogramLast>
// 1D
{kQ3, o2::framework::HistType::kTH1F, "hQ3", "Q_{3}; Q_{3} (GeV/#it{c}); Entries"},
{kMt, o2::framework::HistType::kTH1F, "hMt", "transverse mass; m_{T} (GeV/#it{c}^{2}); Entries"},
{kKstar12, o2::framework::HistType::kTH1F, "hKstar12", "k* between particle 1 and particle 2; k* (GeV/#it{c}); Entries"},
{kKstar13, o2::framework::HistType::kTH1F, "hKstar13", "k* between particle 1 and particle 3; k* (GeV/#it{c}); Entries"},
{kKstar23, o2::framework::HistType::kTH1F, "hKstar23", "k* between particle 2 and particle 3; k* (GeV/#it{c}); Entries"},
// 2D
{kPt1VsQ3, o2::framework::HistType::kTH2F, "hPt1VsQ3", "p_{T,1} vs Q_{3}; p_{T,1} (GeV/#it{c}); Q_{3} (GeV/#it{c})"},
{kPt2VsQ3, o2::framework::HistType::kTH2F, "hPt2VsQ3", "p_{T,2} vs Q_{3}; p_{T,2} (GeV/#it{c}); Q_{3} (GeV/#it{c})"},
Expand Down Expand Up @@ -173,6 +183,9 @@ constexpr std::array<histmanager::HistInfo<TripletHist>, kTripletHistogramLast>
#define TRIPLET_HIST_ANALYSIS_MAP(conf, confMixing) \
{kQ3, {(conf).q3}}, \
{kMt, {(conf).mt}}, \
{kKstar12, {(conf).kstar}}, \
{kKstar13, {(conf).kstar}}, \
{kKstar23, {(conf).kstar}}, \
{kPt1VsQ3, {(conf).pt1, (conf).q3}}, \
{kPt2VsQ3, {(conf).pt2, (conf).q3}}, \
{kPt3VsQ3, {(conf).pt3, (conf).q3}}, \
Expand Down Expand Up @@ -261,6 +274,7 @@ class TripletHistManager
mMtMin = ConfTripletCuts.mtMin.value;
mMtMax = ConfTripletCuts.mtMax.value;

mPlotKstar = ConfTripletBinning.plotKstar.value;
mPlotPt1VsPt2VsPt3 = ConfTripletBinning.plotPt1VsPt2VsPt3.value;
mPlotQ3VsPt1VsPt2VsPt3 = ConfTripletBinning.plotQ3VsPt1VsPt2VsPt3.value;
mPlotQ3VsMtVsMult = ConfTripletBinning.plotQ3VsMtVsMult.value;
Expand Down Expand Up @@ -314,6 +328,10 @@ class TripletHistManager
// set Q3
mQ3 = getQ3(mParticle1, mParticle2, mParticle3);

mKstar12 = getKstar(mParticle1, mParticle2);
mKstar13 = getKstar(mParticle1, mParticle3);
mKstar23 = getKstar(mParticle2, mParticle3);

// if one of the particles has a mass getter, we cache the value for the filling later
if constexpr (utils::HasMass<T1>) {
mMass1 = particle1.mass();
Expand Down Expand Up @@ -495,6 +513,24 @@ class TripletHistManager
return static_cast<float>(std::sqrt(-q));
}

float getKstar(ROOT::Math::PtEtaPhiMVector const& part1, ROOT::Math::PtEtaPhiMVector const& part2)
{
// Use Cartesian 4-vectors: addition/M2() become pure arithmetic
const ROOT::Math::PxPyPzEVector p1(part1);
const ROOT::Math::PxPyPzEVector p2(part2);

// Mandelstam s = (p1 + p2)^2
const double s = (p1 + p2).M2();
const double m1sq = p1.M2();
const double m2sq = p2.M2();

// Källen function λ(s, m1^2, m2^2) = (s - m1^2 - m2^2)² - 4*m1^2*m2^2
const double kallen = (s - m1sq - m2sq) * (s - m1sq - m2sq) - 4.0 * m1sq * m2sq;

// k* = 0.5 * sqrt(λ/s)
return static_cast<float>(0.5 * std::sqrt(std::max(0.0, kallen) / s));
}

void initAnalysis(std::map<TripletHist, std::vector<o2::framework::AxisSpec>> const& Specs)
{
std::string analysisDir = std::string(prefix) + std::string(AnalysisDir);
Expand All @@ -512,6 +548,12 @@ class TripletHistManager
// TODO: implement histograms differential im mass of the particles
}

if (mPlotKstar) {
mHistogramRegistry->add(analysisDir + getHistNameV2(kKstar12, HistTable), getHistDesc(kKstar12, HistTable), getHistType(kKstar12, HistTable), {Specs.at(kKstar12)});
mHistogramRegistry->add(analysisDir + getHistNameV2(kKstar13, HistTable), getHistDesc(kKstar13, HistTable), getHistType(kKstar13, HistTable), {Specs.at(kKstar13)});
mHistogramRegistry->add(analysisDir + getHistNameV2(kKstar23, HistTable), getHistDesc(kKstar23, HistTable), getHistType(kKstar23, HistTable), {Specs.at(kKstar23)});
}

if (mPlotPt1VsPt2VsPt3) {
mHistogramRegistry->add(analysisDir + getHistNameV2(kPt1VsPt2VsPt3, HistTable), getHistDesc(kPt1VsPt2VsPt3, HistTable), getHistType(kPt1VsPt2VsPt3, HistTable), {Specs.at(kPt1VsPt2VsPt3)});
}
Expand Down Expand Up @@ -577,6 +619,12 @@ class TripletHistManager
mHistogramRegistry->fill(HIST(prefix) + HIST(AnalysisDir) + HIST(getHistName(kQ3VsCent, HistTable)), mQ3, mCent);
}

if (mPlotKstar) {
mHistogramRegistry->fill(HIST(prefix) + HIST(AnalysisDir) + HIST(getHistName(kKstar12, HistTable)), mKstar12);
mHistogramRegistry->fill(HIST(prefix) + HIST(AnalysisDir) + HIST(getHistName(kKstar13, HistTable)), mKstar13);
mHistogramRegistry->fill(HIST(prefix) + HIST(AnalysisDir) + HIST(getHistName(kKstar23, HistTable)), mKstar23);
}

if (mPlotPt1VsPt2VsPt3) {
mHistogramRegistry->fill(HIST(prefix) + HIST(AnalysisDir) + HIST(getHistName(kPt1VsPt2VsPt3, HistTable)), mParticle1.Pt(), mParticle2.Pt(), mParticle3.Pt());
}
Expand Down Expand Up @@ -658,6 +706,9 @@ class TripletHistManager
float mMt = 0.f;
float mMult = 0.f;
float mCent = 0.f;
float mKstar12 = 0.f;
float mKstar13 = 0.f;
float mKstar23 = 0.f;

// mc
ROOT::Math::PtEtaPhiMVector mTrueParticle1;
Expand All @@ -680,6 +731,7 @@ class TripletHistManager
bool mPlot1d = true;
bool mPlot2d = true;

bool mPlotKstar = false;
bool mPlotPt1VsPt2VsPt3 = false;
bool mPlotQ3VsPt1VsPt2VsPt3 = false;
bool mPlotQ3VsMtVsMult = false;
Expand Down
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