Skip to content

[PWGLF] Local polarization of Lambda induced by jets in Run3 pp collisions at 13.6 TeV #14096

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
romainschotter merged 2 commits into from
Dec 5, 2025
Merged

[PWGLF] Local polarization of Lambda induced by jets in Run3 pp collisions at 13.6 TeV #14096

Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
eab59f4
Add files via upload
15071832337 Dec 5, 2025
9c62e5e
Add files via upload
15071832337 Dec 5, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
9 changes: 5 additions & 4 deletions PWGLF/Tasks/Strangeness/lambdaJetpolarization.cxx
View file
Open in desktop
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>

Check failure on line 52 in PWGLF/Tasks/Strangeness/lambdaJetpolarization.cxx

View workflow job for this annotation

GitHub Actions / O2 linter

[include-iostream] 

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

Expand Down Expand Up @@ -149,7 +149,8 @@
const AxisSpec axisPy{100, -10, 10, "#py (GeV/c)"};
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, -TMath::Pi(), TMath::Pi(), "#Phi"};
const AxisSpec axisPhi{200, -TMath::Pi(), TMath::Pi(), "#Phi"};
const AxisSpec axisDeltaPhi{200, 0, TMath::Pi(), "#Phi"};
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})"};
Expand Down Expand Up @@ -303,7 +304,7 @@
registryData.add("hprotonThetaInV0", "hprotonThetaInV0", kTH1F, {axisTheta});
registryData.add("hprotonThetaInJetV0", "hprotonThetaInJetV0", kTH1F, {axisTheta});

registryData.add("LambdaQA/TH2FLambdaMassPhiInJet", "TH2FLambdaMassPhiInJet", kTH2F, {{200, -TMath::Pi(), TMath::Pi()}, {200, 0.9, 1.2}});
registryData.add("LambdaQA/TH2FLambdaMassPhiInJet", "TH2FLambdaMassPhiInJet", kTH2F, {{200, 0, TMath::Pi()}, {200, 0.9, 1.2}});

// Lab frame measures
registryData.add("LambdaQA/TH2FprotonCosThetaInLab", "TH2FprotonCosThetaInLab", kTH2F, {{200, 0.9, 1.2}, {200, -1.0, 1.0}});
Expand All @@ -324,8 +325,8 @@
registryData.add("LambdaQA/TH2FprotonCosThetaInJetV0", "TH2FprotonCosThetaInJetV0", kTH2F, {{200, 0.9, 1.2}, {200, -1.0, 1.0}});
registryData.add("LambdaQA/TProfile1DprotonCosThetaInJetV0", "TProfile1DprotonCosThetaInJetV0", {HistType::kTProfile, {{200, 0.9, 1.2}}});
registryData.add("LambdaQA/TProfile1DprotonCos2ThetaInJetV0", "TProfile1DprotonCos2ThetaInJetV0", {HistType::kTProfile, {{200, 0.9, 1.2}}});
registryData.add("LambdaQA/TProfile2DprotonCosThetaInJetV0", "TProfile2DprotonCosThetaInJetV0", kTProfile2D, {TProfile2DaxisMass, axisPhi});
registryData.add("LambdaQA/TProfile2DprotonCos2ThetaInJetV0", "TProfile2DprotonCos2ThetaInJetV0", kTProfile2D, {TProfile2DaxisMass, axisPhi});
registryData.add("LambdaQA/TProfile2DprotonCosThetaInJetV0", "TProfile2DprotonCosThetaInJetV0", kTProfile2D, {TProfile2DaxisMass, axisDeltaPhi});
registryData.add("LambdaQA/TProfile2DprotonCos2ThetaInJetV0", "TProfile2DprotonCos2ThetaInJetV0", kTProfile2D, {TProfile2DaxisMass, axisDeltaPhi});

registryData.add("hNEvents", "hNEvents", {HistType::kTH1D, {{10, 0.f, 10.f}}});
registryData.get<TH1>(HIST("hNEvents"))->GetXaxis()->SetBinLabel(1, "all");
Expand Down Expand Up @@ -369,8 +370,8 @@

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

Check failure on line 373 in PWGLF/Tasks/Strangeness/lambdaJetpolarization.cxx

View workflow job for this annotation

GitHub Actions / O2 linter

[std-prefix] 

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

Check failure on line 374 in PWGLF/Tasks/Strangeness/lambdaJetpolarization.cxx

View workflow job for this annotation

GitHub Actions / O2 linter

[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 @@ -1316,9 +1317,9 @@
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());

Check failure on line 1320 in PWGLF/Tasks/Strangeness/lambdaJetpolarization.cxx

View workflow job for this annotation

GitHub Actions / O2 linter

[std-prefix] 

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

Check failure on line 1321 in PWGLF/Tasks/Strangeness/lambdaJetpolarization.cxx

View workflow job for this annotation

GitHub Actions / O2 linter

[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());

Check failure on line 1322 in PWGLF/Tasks/Strangeness/lambdaJetpolarization.cxx

View workflow job for this annotation

GitHub Actions / O2 linter

[std-prefix] 

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

TMatrixD pLabJet(4, 1);
pLabJet(0, 0) = maxJetE;
Expand All @@ -1340,8 +1341,8 @@

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));

Check failure on line 1344 in PWGLF/Tasks/Strangeness/lambdaJetpolarization.cxx

View workflow job for this annotation

GitHub Actions / O2 linter

[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));

Check failure on line 1345 in PWGLF/Tasks/Strangeness/lambdaJetpolarization.cxx

View workflow job for this annotation

GitHub Actions / O2 linter

[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);

Expand All @@ -1360,8 +1361,8 @@
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));

Check failure on line 1364 in PWGLF/Tasks/Strangeness/lambdaJetpolarization.cxx

View workflow job for this annotation

GitHub Actions / O2 linter

[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));

Check failure on line 1365 in PWGLF/Tasks/Strangeness/lambdaJetpolarization.cxx

View workflow job for this annotation

GitHub Actions / O2 linter

[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;
Expand Down
Loading