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[PWGLF] Local polarization of Lambda induced by jets in Run3 pp collisions at 13.6 TeV #13456

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romainschotter merged 1 commit into from
Oct 20, 2025
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[PWGLF] Local polarization of Lambda induced by jets in Run3 pp collisions at 13.6 TeV #13456

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6 changes: 6 additions & 0 deletions PWGLF/Tasks/Strangeness/lambdaJetpolarization.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -49,7 +49,7 @@
#include <fastjet/tools/Subtractor.hh>

#include <cmath>
#include <iostream>

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[include-iostream] 

Do not include iostream. Use O2 logging instead.
#include <string>
#include <vector>

Expand Down Expand Up @@ -282,6 +282,7 @@
registryData.add("V0LambdaprotonPhi", "V0LambdaprotonPhi", {HistType::kTH1F, {{200, -TMath::Pi() / 2, TMath::Pi() / 2}}});

registryData.add("profileAntiLambda", "Invariant Mass vs sin(phi)", {HistType::kTProfile, {{200, 0.9, 1.2}}});
registryData.add("TProfile1DLambdasinphiInJet", "#Delta #theta vs sin(phi)", {HistType::kTProfile, {{200, 0.0, TMath::Pi()}}});
registryData.add("hAntiLambdamassandSinPhi", "hAntiLambdaPhiandSinPhi", kTH2F, {{200, -TMath::Pi() / 2, TMath::Pi() / 2}, {200, -1, 1}});

registryData.add("TProfile2DLambdaPtMassSinPhi", "", kTProfile2D, {TProfile2DaxisMass, TProfile2DaxisPt});
Expand All @@ -292,6 +293,7 @@
registryData.add("TProfile2DLambdaPtMassCosSquareTheta", "", kTProfile2D, {TProfile2DaxisMass, TProfile2DaxisPt});
registryData.add("TProfile2DAntiLambdaPtMassCosSquareTheta", "", kTProfile2D, {TProfile2DaxisMass, TProfile2DaxisPt});
registryData.add("TProfile2DLambdaMassDeltaPhi", "", kTProfile2D, {{200, -TMath::Pi(), TMath::Pi(), "#Delta#varphi"}, TProfile2DaxisMass});
registryData.add("TProfile2DLambdaMassDeltaTheta", "", kTProfile2D, {{200, 0, TMath::Pi(), "#Delta#theta"}, TProfile2DaxisMass});
registryData.add("TProfile2DAntiLambdaMassDeltaPhi", "", kTProfile2D, {{200, -TMath::Pi(), TMath::Pi(), "#Delta#varphi"}, TProfile2DaxisMass});
registryData.add("hprotonThetaInLab", "hprotonThetaInLab", kTH1F, {axisTheta});
registryData.add("hprotonThetaInV0", "hprotonThetaInV0", kTH1F, {axisTheta});
Expand Down Expand Up @@ -339,8 +341,8 @@

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 @@ -1255,9 +1257,9 @@
registryData.fill(HIST("protonQA/V0protonpyInLab"), pos.py());
registryData.fill(HIST("protonQA/V0protonpzInLab"), pos.pz());

double PLambda = sqrt(candidate.px() * candidate.px() + candidate.py() * candidate.py() + candidate.pz() * candidate.pz());

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[std-prefix] 

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

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[std-prefix] 

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double protonE = sqrt(massPr * massPr + pos.px() * pos.px() + pos.py() * pos.py() + pos.pz() * pos.pz());

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[std-prefix] 

Use std:: prefix for names from the std namespace.

TMatrixD pLabJet(4, 1);
pLabJet(0, 0) = maxJetE;
Expand All @@ -1279,6 +1281,10 @@

TMatrixD lambdaInJet(4, 1);
lambdaInJet = MyTMatrixTranslationToJet(maxJetpx, maxJetpy, maxJetpz, candidate.px(), candidate.py(), candidate.pz()) * pLabV0;
double cosThetaLambdaInJet = lambdaInJet(3, 0) / sqrt(lambdaInJet(1, 0) * lambdaInJet(1, 0) + lambdaInJet(2, 0) * lambdaInJet(2, 0) + lambdaInJet(3, 0) * lambdaInJet(3, 0));

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[std-prefix] 

Use std:: prefix for names from the std namespace.
double lambdasinphiInJet = lambdaInJet(2, 0) / sqrt(lambdaInJet(1, 0) * lambdaInJet(1, 0) + lambdaInJet(2, 0) * lambdaInJet(2, 0));

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[std-prefix] 

Use std:: prefix for names from the std namespace.
registryData.fill(HIST("TProfile2DLambdaMassDeltaTheta"), TMath::ACos(cosThetaLambdaInJet), candidate.mLambda(), lambdasinphiInJet);
registryData.fill(HIST("TProfile1DLambdasinphiInJet"), TMath::ACos(cosThetaLambdaInJet), lambdasinphiInJet);

TMatrixD lambdaInJetV0(4, 1);
lambdaInJetV0 = LorentzTransInV0frame(ELambda, lambdaInJet(1, 0), lambdaInJet(2, 0), lambdaInJet(3, 0)) * MyTMatrixTranslationToJet(maxJetpx, maxJetpy, maxJetpz, candidate.px(), candidate.py(), candidate.pz()) * pLabV0;
Expand All @@ -1291,8 +1297,8 @@
pLabproton(1, 0) = pos.px();
pLabproton(2, 0) = pos.py();
pLabproton(3, 0) = pos.pz();
double protonsinPhiInLab = pLabproton(2, 0) / sqrt(pLabproton(1, 0) * pLabproton(1, 0) + pLabproton(2, 0) * pLabproton(2, 0));

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[std-prefix] 

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double protoncosthetaInLab = pLabproton(3, 0) / sqrt(pLabproton(1, 0) * pLabproton(1, 0) + pLabproton(2, 0) * pLabproton(2, 0) + pLabproton(3, 0) * pLabproton(3, 0));

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[std-prefix] 

Use std:: prefix for names from the std namespace.
double protonPtInLab = sqrt(pLabproton(1, 0) * pLabproton(1, 0) + pLabproton(2, 0) * pLabproton(2, 0));
double protonPInLab = sqrt(pLabproton(1, 0) * pLabproton(1, 0) + pLabproton(2, 0) * pLabproton(2, 0) + pLabproton(3, 0) * pLabproton(3, 0));
double protonsinThetaInLab = protonPtInLab / protonPInLab;
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