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[PWGLF] Local polarization of Lambda induced by jets in Run3 pp collisions at 13.6 TeV #13450

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romainschotter merged 1 commit into from
Oct 19, 2025
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[PWGLF] Local polarization of Lambda induced by jets in Run3 pp collisions at 13.6 TeV #13450

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12 changes: 7 additions & 5 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 @@ -150,7 +150,7 @@
const AxisSpec axisPz{100, -10, 10, "#pz (GeV/c)"};
const AxisSpec axisPT{200, 0, 50, "#it{p}_{T} (GeV/#it{c})"};
const AxisSpec axisPhi{100, -3.14, 3.14, "#Phi"};
const AxisSpec axisTheta{100, 0, 3.14, "#Theta"};
const AxisSpec axisTheta{100, -TMath::Pi(), TMath::Pi(), "#Theta"};
const AxisSpec axisMass{100, 0.9, 1.0, "Mass(GeV/c^{2})"};
const AxisSpec axisCostheta{100, -1, 1, "Cos(#theta^{*}_{p})"};
const AxisSpec axisSinPhi{100, -1, 1, "Sin(#phi^{*}_{p})"};
Expand Down Expand Up @@ -339,8 +339,8 @@

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 @@ -1120,9 +1120,11 @@
using StrHadronDaughterTracks = soa::Join<aod::Tracks, aod::TracksIU, aod::TracksExtra, aod::TracksCovIU, aod::TracksDCA, aod::pidTPCFullPi, aod::pidTPCFullKa, aod::pidTPCFullPr, aod::pidTOFFullPi, aod::pidTOFFullKa, aod::pidTOFFullPr>;
void processData(SelV0Collisions::iterator const& collision, aod::V0Datas const& fullV0s, StrHadronDaughterTracks const& tracks)
{
registryData.fill(HIST("hNEvents"), 0.5);
if (!AcceptEvent(collision)) {
return;
}
registryData.fill(HIST("hNEvents"), 8.5);
// event selection
// loop over reconstructed tracks
std::vector<fastjet::PseudoJet> fjParticles;
Expand Down Expand Up @@ -1253,9 +1255,9 @@
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] 

Use std:: prefix for names from the std namespace.
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 Down Expand Up @@ -1289,10 +1291,10 @@
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] 

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

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double protonPtInLab = sqrt(pLabproton(1, 0) * pLabproton(1, 0) + pLabproton(2, 0) * pLabproton(2, 0));

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[std-prefix] 

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double protonPInLab = 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] 

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double protonsinThetaInLab = protonPtInLab / protonPInLab;
double protonMassInLab = sqrt(pLabproton(0, 0) * pLabproton(0, 0) - pLabproton(1, 0) * pLabproton(1, 0) - pLabproton(2, 0) * pLabproton(2, 0) - pLabproton(3, 0) * pLabproton(3, 0));
double jettheta = maxJetpz / sqrt(pLabJet(1, 0) * pLabJet(1, 0) + pLabJet(2, 0) * pLabJet(2, 0) + pLabJet(3, 0) * pLabJet(3, 0));
Expand All @@ -1306,7 +1308,7 @@
registryData.fill(HIST("JetQA/JetptInLab"), jetptInLab);

registryData.fill(HIST("protonQA/V0protonphiInLab"), TMath::ASin(protonsinPhiInLab));
registryData.fill(HIST("protonQA/V0protonthetaInLab"), TMath::ASin(protonsinThetaInLab));
registryData.fill(HIST("protonQA/V0protonthetaInLab"), TMath::ACos(protoncosthetaInLab));
registryData.fill(HIST("protonQA/V0protoncosthetaInLab"), protoncosthetaInLab);
registryData.fill(HIST("protonQA/profileprotonsinthetaInLab"), candidate.mLambda(), protonsinThetaInLab);
registryData.fill(HIST("protonQA/profileprotonsinphiInLab"), candidate.mLambda(), protonsinPhiInLab);
Expand Down Expand Up @@ -1339,7 +1341,7 @@
double protonsinPhiInV0frame = protonInV0(2, 0) / sqrt(protonInV0(1, 0) * protonInV0(1, 0) + protonInV0(2, 0) * protonInV0(2, 0));
double protoncosthetaInV0frame = protonInV0(3, 0) / sqrt(protonInV0(1, 0) * protonInV0(1, 0) + protonInV0(2, 0) * protonInV0(2, 0) + protonInV0(3, 0) * protonInV0(3, 0));
registryData.fill(HIST("protonQA/V0protonphiInRest_frame"), TMath::ASin(protonsinPhiInV0frame));
registryData.fill(HIST("protonQA/V0protonthetaInRest_frame"), TMath::ASin(protonsinThetaInV0));
registryData.fill(HIST("protonQA/V0protonthetaInRest_frame"), TMath::ACos(protoncosthetaInV0frame));
registryData.fill(HIST("protonQA/V0protoncosthetaInV0frame"), protoncosthetaInV0frame);
registryData.fill(HIST("protonQA/profileprotonsinthetaInV0frame"), candidate.mLambda(), protonsinThetaInV0);
registryData.fill(HIST("protonQA/profileprotonsinphiInV0frame"), candidate.mLambda(), protonsinPhiInV0frame);
Expand Down Expand Up @@ -1370,7 +1372,7 @@
registryData.fill(HIST("protonQA/V0protonpyInJetframe"), protonInJet(2, 0));
registryData.fill(HIST("protonQA/V0protonpzInJetframe"), protonInJet(3, 0));
registryData.fill(HIST("protonQA/V0protonphiInJetframe"), TMath::ASin(protonsinPhiInJet));
registryData.fill(HIST("protonQA/V0protonthetaInJetframe"), TMath::ASin(protonSinThetainJet));
registryData.fill(HIST("protonQA/V0protonthetaInJetframe"), TMath::ACos(protoncosthetaInJet));
registryData.fill(HIST("protonQA/V0protoncosthetaInJetframe"), protoncosthetaInJet);
registryData.fill(HIST("protonQA/profileprotonsinthetaInJetframe"), candidate.mLambda(), protonSinThetainJet);
registryData.fill(HIST("protonQA/profileprotonsinphiInJetframe"), candidate.mLambda(), protonsinPhiInJet);
Expand Down Expand Up @@ -1402,7 +1404,7 @@
registryData.fill(HIST("protonQA/V0protonpyInJetV0frame"), protonInJetV0(2, 0));
registryData.fill(HIST("protonQA/V0protonpzInJetV0frame"), protonInJetV0(3, 0));
registryData.fill(HIST("protonQA/V0protonphiInJetV0frame"), TMath::ASin(protonsinphiInJetV0));
registryData.fill(HIST("protonQA/V0protonthetaInJetV0frame"), TMath::ASin(protonSinThetainJetV0));
registryData.fill(HIST("protonQA/V0protonthetaInJetV0frame"), TMath::ACos(protoncosthetaInJetV0));
registryData.fill(HIST("protonQA/V0protoncosthetaInJetV0"), protoncosthetaInJetV0);
registryData.fill(HIST("protonQA/V0protonMassInJetV0frame"), protonMassInJetV0frame);
registryData.fill(HIST("protonQA/profileprotonsinthetaInJetV0frame"), candidate.mLambda(), protonSinThetainJetV0);
Expand Down
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