[mintu1999]

Summary

This PR adds a new task, mftcorrelations, to PWGCF/TwoParticleCorrelations/Tasks. It studies two-particle azimuthal correlations built from MFT tracks. It constructs the same-event and mixed-event distributions, using CorrelationContainer for the correlation histograms.

Changes

• New task: PWGCF/TwoParticleCorrelations/Tasks/mftcorrelations.cxx, registered in CMakeLists.txt as mft-correlations.
• Core change: PWGCF/Core/CorrelationContainer.cxx now has an extra efficiency axis, used to correct the φ distribution of MFT tracks.

Testing

• Data: pp, LHC24ap_apass1
• MC: LHC25b4a6
• clang-format applied and the O2-linter passes locally.

[github-actions]

O2 linter results: ❌ 0 errors, ⚠️ 170 warnings, 🔕 0 disabled

[mintu1999]

All required tests are successful. Kindly approve for further checks.

[vkucera]

You need to resolve the conflicts first.

[mintu1999]

Dear @vkucera,

I have now resolved the conflicts. All the required tests are successful. kindly approve for further checks.

[vkucera]

Dear @vkucera,

I have now resolved the conflicts. All the required tests are successful. kindly approve for further checks.

Why did you not fix issues reported by the non-required tests as well?

[mintu1999]

Dear @vkucera,
I have now also fixed the issues reported by the non-required tests. Kindly approve for further checks.

[alibuild]

Error while checking build/O2Physics/code-check for aeaf83e at 2026-10-31 12:26:

## sw/BUILD/O2Physics-code-check-latest/log
--
========== List of issues found ==========
++ echo 'To reproduce the results below locally, run: '\''aliBuild build O2Physics-code-check -e ALIBUILD_BASE_HASH=upstream/master'\''.'
To reproduce the results below locally, run: 'aliBuild build O2Physics-code-check -e ALIBUILD_BASE_HASH=upstream/master'.
++ echo 'To apply all automatic fixes, add the '\''-e O2PHYSICS_CHECKER_FIX=1'\'' option.'
To apply all automatic fixes, add the '-e O2PHYSICS_CHECKER_FIX=1' option.
++ echo 'See the documentation for more details at: <https://aliceo2group.github.io/analysis-framework/docs/tools/#running-with-o2physics-code-check>.'
See the documentation for more details at: <https://aliceo2group.github.io/analysis-framework/docs/tools/#running-with-o2physics-code-check>.
++ echo 'Found 33 errors and 91 warnings.'
Found 33 errors and 91 warnings.
++ [[ 33 -gt 0 ]]
++ cat /sw/BUILD/9f5b87485788f61a43ed90f5a7f0d70e8e7b9c2e/O2Physics-code-check/errors.txt
PWGCF/Core/CorrelationContainer.cxx:27:1: error: included header TH1D.h is not used directly [misc-include-cleaner,-warnings-as-errors]
PWGCF/Core/CorrelationContainer.cxx:28:1: error: included header TH2D.h is not used directly [misc-include-cleaner,-warnings-as-errors]
PWGCF/Core/CorrelationContainer.cxx:29:1: error: included header TH3D.h is not used directly [misc-include-cleaner,-warnings-as-errors]
PWGCF/Core/CorrelationContainer.cxx:31:1: error: included header THnSparse.h is not used directly [misc-include-cleaner,-warnings-as-errors]
PWGCF/Core/CorrelationContainer.cxx:213:34: error: do not use static_cast to downcast from a base to a derived class; use dynamic_cast instead [cppcoreguidelines-pro-type-static-cast-downcast,-warnings-as-errors]
PWGCF/Core/CorrelationContainer.cxx:530:57: error: C-style casts are discouraged; use static_cast [google-readability-casting,-warnings-as-errors]
PWGCF/Core/CorrelationContainer.cxx:638:7: error: Value stored to 'mixedNormError' is never read [clang-analyzer-deadcode.DeadStores,-warnings-as-errors]
PWGCF/Core/CorrelationContainer.cxx:735:25: error: do not use static_cast to downcast from a base to a derived class; use dynamic_cast instead [cppcoreguidelines-pro-type-static-cast-downcast,-warnings-as-errors]
PWGCF/Core/CorrelationContainer.cxx:773:18: error: C-style casts are discouraged; use static_cast [google-readability-casting,-warnings-as-errors]
PWGCF/Core/CorrelationContainer.cxx:843:20: error: do not use static_cast to downcast from a base to a derived class; use dynamic_cast instead [cppcoreguidelines-pro-type-static-cast-downcast,-warnings-as-errors]
PWGCF/Core/CorrelationContainer.cxx:943:32: error: C-style casts are discouraged; use static_cast [google-readability-casting,-warnings-as-errors]
PWGCF/Core/CorrelationContainer.cxx:1017:13: error: do not use static_cast to downcast from a base to a derived class; use dynamic_cast instead [cppcoreguidelines-pro-type-static-cast-downcast,-warnings-as-errors]
PWGCF/Core/CorrelationContainer.cxx:1027:13: error: do not use static_cast to downcast from a base to a derived class; use dynamic_cast instead [cppcoreguidelines-pro-type-static-cast-downcast,-warnings-as-errors]
PWGCF/Core/CorrelationContainer.cxx:1177:19: error: redundant explicit casting to the same type 'TH1D *' as the sub-expression, remove this casting [readability-redundant-casting,-warnings-as-errors]
PWGCF/Core/CorrelationContainer.cxx:1178:17: error: redundant explicit casting to the same type 'TH3D *' as the sub-expression, remove this casting [readability-redundant-casting,-warnings-as-errors]
PWGCF/Core/CorrelationContainer.cxx:1183:19: error: redundant explicit casting to the same type 'TH1D *' as the sub-expression, remove this casting [readability-redundant-casting,-warnings-as-errors]
PWGCF/Core/CorrelationContainer.cxx:1184:17: error: redundant explicit casting to the same type 'TH3D *' as the sub-expression, remove this casting [readability-redundant-casting,-warnings-as-errors]
PWGCF/Core/CorrelationContainer.cxx:1437:23: error: do not use static_cast to downcast from a base to a derived class; use dynamic_cast instead [cppcoreguidelines-pro-type-static-cast-downcast,-warnings-as-errors]
PWGCF/Core/CorrelationContainer.cxx:1580:13: error: C-style casts are discouraged; use static_cast/const_cast/reinterpret_cast [google-readability-casting,-warnings-as-errors]
PWGCF/TwoParticleCorrelations/Tasks/mftcorrelations.cxx:18:1: error: included header PairCuts.h is not used directly [misc-include-cleaner,-warnings-as-errors]
PWGCF/TwoParticleCorrelations/Tasks/mftcorrelations.cxx:20:1: error: included header TriggerAliases.h is not used directly [misc-include-cleaner,-warnings-as-errors]
PWGCF/TwoParticleCorrelations/Tasks/mftcorrelations.cxx:31:1: error: included header ASoAHelpers.h is not used directly [misc-include-cleaner,-warnings-as-errors]
PWGCF/TwoParticleCorrelations/Tasks/mftcorrelations.cxx:48:1: error: included header TMath.h is not used directly [misc-include-cleaner,-warnings-as-errors]
PWGCF/TwoParticleCorrelations/Tasks/mftcorrelations.cxx:49:1: error: included header TVector2.h is not used directly [misc-include-cleaner,-warnings-as-errors]
PWGCF/TwoParticleCorrelations/Tasks/mftcorrelations.cxx:283:39: error: no header providing "std::distance" is directly included [misc-include-cleaner,-warnings-as-errors]
PWGCF/TwoParticleCorrelations/Tasks/mftcorrelations.cxx:389:34: error: do not use reinterpret_cast [cppcoreguidelines-pro-type-reinterpret-cast,-warnings-as-errors]
PWGCF/TwoParticleCorrelations/Tasks/mftcorrelations.cxx:401:37: error: do not use reinterpret_cast [cppcoreguidelines-pro-type-reinterpret-cast,-warnings-as-errors]
PWGCF/TwoParticleCorrelations/Tasks/mftcorrelations.cxx:414:33: error: do not use reinterpret_cast [cppcoreguidelines-pro-type-reinterpret-cast,-warnings-as-errors]
PWGCF/TwoParticleCorrelations/Tasks/mftcorrelations.cxx:450:7: error: no header providing "TAxis" is directly included [misc-include-cleaner,-warnings-as-errors]
PWGCF/TwoParticleCorrelations/Tasks/mftcorrelations.cxx:528:22: error: do not use reinterpret_cast [cppcoreguidelines-pro-type-reinterpret-cast,-warnings-as-errors]
PWGCF/TwoParticleCorrelations/Tasks/mftcorrelations.cxx:810:28: error: no header providing "std::is_same" is directly included [misc-include-cleaner,-warnings-as-errors]
PWGCF/TwoParticleCorrelations/Tasks/mftcorrelations.cxx:972:5: error: no header providing "o2::framework::SameKindPair" is directly included [misc-include-cleaner,-warnings-as-errors]
PWGCF/TwoParticleCorrelations/Tasks/mftcorrelations.cxx:1027:5: error: no header providing "o2::framework::Pair" is directly included [misc-include-cleaner,-warnings-as-errors]
++ [[ 91 -gt 0 ]]
++ cat /sw/BUILD/9f5b87485788f61a43ed90f5a7f0d70e8e7b9c2e/O2Physics-code-check/warnings.txt
PWGCF/Core/CorrelationContainer.cxx:55:48: warning: initializer for base class 'TNamed' is redundant [readability-redundant-member-init]
[0 more errors; see full log]

Full log here.