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[PWGLF] Lambda local polarization induced by jet in pp collision 13.6 TeV #11410

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romainschotter merged 1 commit into from
May 30, 2025
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[PWGLF] Lambda local polarization induced by jet in pp collision 13.6 TeV #11410

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17 changes: 9 additions & 8 deletions PWGLF/Tasks/Strangeness/lambdaJetpolarization.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -11,7 +11,7 @@
///

/// \author Youpeng Su (yousu@cern.ch)
#include <iostream>

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[include-iostream] 

Do not include iostream. Use O2 logging instead.
#include <string>
#include <vector>
#include <cmath>
Expand Down Expand Up @@ -134,6 +134,7 @@
const AxisSpec invMassLambdaAxis{200, 1.09, 1.14, "m_{p#pi} (GeV/#it{c}^{2})"};

ConfigurableAxis TProfile2DaxisPt{"#it{p}_{T} (GeV/#it{c})", {VARIABLE_WIDTH, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.4, 1.6, 1.8, 2.0, 2.2, 2.4, 2.6, 2.8, 3.2, 3.7, 4.2, 5, 6, 8, 10, 12}, "pt axis for histograms"};
ConfigurableAxis TProfile2DaxisMass{"Mass p#pi (GeV/#it{c^{2}})", {VARIABLE_WIDTH, 1.10068, 1.10668, 1.11068, 1.11268, 1.11368, 1.11468, 1.11568, 1.11668, 1.11768, 1.11868, 1.12068, 1.12468, 1.13068}, "Mass axis for histograms"};

registry.add("hMassLambda", "hMassLambda", {HistType::kTH1F, {{200, 0.9f, 1.2f}}});
registry.add("V0pTInLab", "V0pTInLab", kTH1F, {axisPT});
Expand Down Expand Up @@ -253,13 +254,13 @@
registryData.add("profileAntiLambda", "Invariant Mass vs sin(phi)", {HistType::kTProfile, {{200, 0.9, 1.2}}});
registryData.add("hAntiLambdamassandSinPhi", "hAntiLambdaPhiandSinPhi", kTH2F, {{200, -TMath::Pi() / 2, TMath::Pi() / 2}, {200, -1, 1}});

registryData.add("TProfile2DLambdaPtMassSinPhi", "", kTProfile2D, {invMassLambdaAxis, TProfile2DaxisPt});
registryData.add("TProfile2DAntiLambdaPtMassSinPhi", "", kTProfile2D, {invMassLambdaAxis, TProfile2DaxisPt});
registryData.add("TProfile2DLambdaPtMassSintheta", "", kTProfile2D, {invMassLambdaAxis, TProfile2DaxisPt});
registryData.add("TProfile2DAntiLambdaPtMassSintheta", "", kTProfile2D, {invMassLambdaAxis, TProfile2DaxisPt});
registryData.add("TProfile2DLambdaPtMassSinPhi", "", kTProfile2D, {TProfile2DaxisMass, TProfile2DaxisPt});
registryData.add("TProfile2DAntiLambdaPtMassSinPhi", "", kTProfile2D, {TProfile2DaxisMass, TProfile2DaxisPt});
registryData.add("TProfile2DLambdaPtMassSintheta", "", kTProfile2D, {TProfile2DaxisMass, TProfile2DaxisPt});
registryData.add("TProfile2DAntiLambdaPtMassSintheta", "", kTProfile2D, {TProfile2DaxisMass, TProfile2DaxisPt});

registryData.add("TProfile2DLambdaPtMassCosSquareTheta", "", kTProfile2D, {invMassLambdaAxis, TProfile2DaxisPt});
registryData.add("TProfile2DAntiLambdaPtMassCosSquareTheta", "", kTProfile2D, {invMassLambdaAxis, TProfile2DaxisPt});
registryData.add("TProfile2DLambdaPtMassCosSquareTheta", "", kTProfile2D, {TProfile2DaxisMass, TProfile2DaxisPt});
registryData.add("TProfile2DAntiLambdaPtMassCosSquareTheta", "", kTProfile2D, {TProfile2DaxisMass, TProfile2DaxisPt});

registryData.add("hNEvents", "hNEvents", {HistType::kTH1I, {{10, 0.f, 10.f}}});
registryData.get<TH1>(HIST("hNEvents"))->GetXaxis()->SetBinLabel(1, "all");
Expand Down Expand Up @@ -317,8 +318,8 @@

TMatrixD LorentzTransInV0frame(double ELambda, double Lambdapx, double Lambdapy, double Lambdapz)
{
double PLambda = sqrt(Lambdapx * Lambdapx + Lambdapy * Lambdapy + Lambdapz * Lambdapz);

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[std-prefix] 

Use std:: prefix for names from the std namespace.
double LambdaMass = sqrt(ELambda * ELambda - PLambda * PLambda);

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[std-prefix] 

Use std:: prefix for names from the std namespace.
double Alpha = 1 / (LambdaMass * (ELambda + LambdaMass));
TMatrixD matrixLabToLambda(4, 4);
matrixLabToLambda(0, 0) = ELambda / LambdaMass;
Expand Down Expand Up @@ -385,10 +386,10 @@
registry.fill(HIST("V0protonpxInLab"), candidate.v0protonpx());
registry.fill(HIST("V0protonpyInLab"), candidate.v0protonpy());
registry.fill(HIST("V0protonpzInLab"), candidate.v0protonpz());
double protonsinPhiInLab = candidate.v0protonpy() / sqrt(candidate.v0protonpx() * candidate.v0protonpx() + candidate.v0protonpy() * candidate.v0protonpy());

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[std-prefix] 

Use std:: prefix for names from the std namespace.
registry.fill(HIST("V0protonphiInLab"), protonsinPhiInLab);
double PLambda = sqrt(candidate.v0px() * candidate.v0px() + candidate.v0py() * candidate.v0py() + candidate.v0pz() * candidate.v0pz());

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[std-prefix] 

Use std:: prefix for names from the std namespace.
double ELambda = sqrt(candidate.v0Lambdamass() * candidate.v0Lambdamass() + PLambda * PLambda);

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[std-prefix] 

Use std:: prefix for names from the std namespace.
TMatrixD pLabV0(4, 1);
pLabV0(0, 0) = ELambda;
pLabV0(1, 0) = candidate.v0px();
Expand All @@ -401,17 +402,17 @@
registry.fill(HIST("V0pzInRest_frame"), V0InV0(3, 0));
}
for (auto& candidate : myv0s) {
double PLambda = sqrt(candidate.v0px() * candidate.v0px() + candidate.v0py() * candidate.v0py() + candidate.v0pz() * candidate.v0pz());

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[std-prefix] 

Use std:: prefix for names from the std namespace.
double ELambda = sqrt(candidate.v0Lambdamass() * candidate.v0Lambdamass() + PLambda * PLambda);

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[std-prefix] 

Use std:: prefix for names from the std namespace.
TMatrixD pLabproton(4, 1);
double protonE = sqrt(massPr * massPr + candidate.v0protonpx() * candidate.v0protonpx() + candidate.v0protonpy() * candidate.v0protonpy() + candidate.v0protonpz() * candidate.v0protonpz());

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[std-prefix] 

Use std:: prefix for names from the std namespace.
pLabproton(0, 0) = protonE;
pLabproton(1, 0) = candidate.v0protonpx();
pLabproton(2, 0) = candidate.v0protonpy();
pLabproton(3, 0) = candidate.v0protonpz();
TMatrixD protonInV0(4, 1);
protonInV0 = LorentzTransInV0frame(ELambda, candidate.v0px(), candidate.v0py(), candidate.v0pz()) * pLabproton;
double protonMassInV0 = sqrt(protonInV0(0, 0) * protonInV0(0, 0) - protonInV0(1, 0) * protonInV0(1, 0) - protonInV0(2, 0) * protonInV0(2, 0) - protonInV0(3, 0) * protonInV0(3, 0));

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[std-prefix] 

Use std:: prefix for names from the std namespace.
registry.fill(HIST("V0protonMassInRest_frame"), protonMassInV0);
registry.fill(HIST("V0protonpxInRest_frame"), protonInV0(1, 0));
registry.fill(HIST("V0protonpyInRest_frame"), protonInV0(2, 0));
Expand Down Expand Up @@ -1024,7 +1025,7 @@

registryData.fill(HIST("TProfile2DLambdaPtMassSinPhi"), candidate.mLambda(), candidate.pt(), protonInJetV0(2, 0) / sqrt(protonInJetV0(1, 0) * protonInJetV0(1, 0) + protonInJetV0(2, 0) * protonInJetV0(2, 0)));
registryData.fill(HIST("TProfile2DLambdaPtMassSintheta"), candidate.mLambda(), candidate.pt(), (4.0 / TMath::Pi()) * protonSinThetainJetV0);
registryData.fill(HIST("TProfile2DLambdaPtMassCosSquareTheta"), candidate.mLambda(), candidate.pt(), protonCosThetainJetV0 * protonCosThetainJetV0 / 3.0);
registryData.fill(HIST("TProfile2DLambdaPtMassCosSquareTheta"), candidate.mLambda(), candidate.pt(), 3.0 * protonCosThetainJetV0 * protonCosThetainJetV0);
}
if (passedAntiLambdaSelection(candidate, pos, neg)) {
registryData.fill(HIST("hMassAntiLambda"), candidate.mAntiLambda());
Expand Down Expand Up @@ -1056,7 +1057,7 @@
double AntiprotonSinThetainJetV0 = AntiprotonPtinJetV0 / AntiprotonPinJetV0;
registryData.fill(HIST("TProfile2DAntiLambdaPtMassSinPhi"), candidate.mAntiLambda(), candidate.pt(), AntiprotonInJetV0(2, 0) / sqrt(AntiprotonInJetV0(1, 0) * AntiprotonInJetV0(1, 0) + AntiprotonInJetV0(2, 0) * AntiprotonInJetV0(2, 0)));
registryData.fill(HIST("TProfile2DAntiLambdaPtMassSintheta"), candidate.mAntiLambda(), candidate.pt(), (4.0 / TMath::Pi()) * AntiprotonSinThetainJetV0);
registryData.fill(HIST("TProfile2DAntiLambdaPtMassCosSquareTheta"), candidate.mAntiLambda(), candidate.pt(), AntiprotonCosThetainJetV0 * AntiprotonCosThetainJetV0 / 3.0);
registryData.fill(HIST("TProfile2DAntiLambdaPtMassCosSquareTheta"), candidate.mAntiLambda(), candidate.pt(), 3.0 * AntiprotonCosThetainJetV0 * AntiprotonCosThetainJetV0);
}
}

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