[PWGHF] HFInvMassFitter: code cleaning and refactoring

[lubynets]

Bugfix:

• Before the json configurable UseLikelihood did not have any effect: independently on its value true or false, always likelihood fit was performed. This bug is fixed now. Note: it seems that in Chi2 mode (when RooAbsPdf::chi2FitTo() function is called) setting the fitting range has no effect. This problem is to be investigated, any help will be highly appreciated;

Code cleaning and refactoring:

• Reduced code repetition in several places;
• Used enums instead of magic values for fit functions and config parameters;
• Used std::array instead of std::vectors when the size is known at the compilation time;
• ROOT types replaced with standard c++ types (with an exception for TString in several places);
• Got rid of compilation warnings;
• Deleted the default constructor UPD: since it was not used and served exclusively as an entry point for running the fitter as a Root macro. Now the instructions how to run the fitter as a Root macro are fixed and do not require default constructor as an entry point any more;
• Factored out into a function:
  • open file and check for nullptr;
  • get object from file and check for nullptr;
  • read variables and vectors from json configurables; avoid crash when the field is optional and crash with explicit error message when the field is mandatory;
  • check whether the vector of configurables has the same size as number of fitting ranges (or zero if the vector is optional);
• Got rid of unnecessary histograms cloning when passing them from file to the fitter and when rebinning them;
• Function implementations, which occupy more than 1 line, moved from header to the source file.

[github-actions]

O2 linter results: ❌ 1 errors, ⚠️ 0 warnings, 🔕 0 disabled

[vkucera]

Hi @lubynets , thanks for the extensive improvement. Can you please also fix the issues reported in the bug tracker?

[lubynets]

Hi @lubynets , thanks for the extensive improvement. Can you please also fix the issues reported in the bug tracker?

Done.

[vkucera]

Hi @lubynets , thanks for the extensive improvement. Can you please also fix the issues reported in the bug tracker?

Done.

Thanks but it doesn't seem you fixed the issues found by Clang-Tidy, e.g. setNumberOfSigmaForSidebands still assigns double to int.

[lubynets]

Hi @lubynets , thanks for the extensive improvement. Can you please also fix the issues reported in the bug tracker?

Done.

Thanks but it doesn't seem you fixed the issues found by Clang-Tidy, e.g. setNumberOfSigmaForSidebands still assigns double to int.

Indeed, there is such an issue. However I cannot read it at this page. For me the list of issues ends up at DPG/Tasks/AOTTrack/PID/HMPID/hmpidQa.cxx. And when I click on any link in the table of content below the DPG, I cannot access it (the same applies to PWGHF). Is it a limitation of how github page is shown to user? (sorry for probably naive question, but it persists e.g. with another browser).
UPD: found a tip with .md in the end of url.

[lubynets]

Hi @lubynets , thanks for the extensive improvement. Can you please also fix the issues reported in the bug tracker?

Done.

Thanks but it doesn't seem you fixed the issues found by Clang-Tidy, e.g. setNumberOfSigmaForSidebands still assigns double to int.

Now it should be fixed (sorry in advance if I overlooked something).

[vkucera]

Hi @lubynets , thanks for the extensive improvement. Can you please also fix the issues reported in the bug tracker?

Done.

Thanks but it doesn't seem you fixed the issues found by Clang-Tidy, e.g. setNumberOfSigmaForSidebands still assigns double to int.

Indeed, there is such an issue. However I cannot read it at this page. For me the list of issues ends up at DPG/Tasks/AOTTrack/PID/HMPID/hmpidQa.cxx. And when I click on any link in the table of content below the DPG, I cannot access it (the same applies to PWGHF). Is it a limitation of how github page is shown to user? (sorry for probably naive question, but it persists e.g. with another browser). UPD: found a tip with .md in the end of url.

Yes, that's why there is this below the title:

To access the full raw file, add .md in the URL.

[vkucera]

Hi @lubynets , thanks for the extensive improvement. Can you please also fix the issues reported in the bug tracker?

Done.

Thanks but it doesn't seem you fixed the issues found by Clang-Tidy, e.g. setNumberOfSigmaForSidebands still assigns double to int.

Now it should be fixed (sorry in advance if I overlooked something).

Thanks!

[vkucera]

@pstahlhu Since you also contributed to this code recently, can you please have a look?

[alibuild]

Error while checking build/O2Physics/o2 for b89f95f at 2026-01-10 04:09:

[1545/2849] Building CXX object PWGJE/JetFinders/CMakeFiles/O2Physicsexe-analysis-je-jet-finder-bplus-mcp-charged.dir/jetFinderBplusMCPCharged.cxx.o
[1546/2849] Linking CXX executable stage/bin/o2-analysis-je-jet-finder-bplus-mcd-charged
[1547/2849] Linking CXX executable stage/bin/o2-analysis-je-jet-finder-bplus-mcp-charged
[1548/2849] Building CXX object PWGJE/JetFinders/CMakeFiles/O2Physicsexe-analysis-je-jet-finder-xictoxipipi-data-charged.dir/jetFinderXicToXiPiPiDataCharged.cxx.o
[1549/2849] Building CXX object PWGJE/JetFinders/CMakeFiles/O2Physicsexe-analysis-je-jet-finder-v0-data-charged.dir/jetFinderV0DataCharged.cxx.o
[1550/2849] Linking CXX executable stage/bin/o2-analysis-je-jet-finder-xictoxipipi-data-charged
[1551/2849] Building CXX object PWGJE/JetFinders/CMakeFiles/O2Physicsexe-analysis-je-jet-finder-xictoxipipi-mcd-charged.dir/jetFinderXicToXiPiPiMCDCharged.cxx.o
[1552/2849] Linking CXX executable stage/bin/o2-analysis-je-jet-finder-v0-data-charged
[1553/2849] Linking CXX executable stage/bin/o2-analysis-je-jet-finder-xictoxipipi-mcd-charged
[1554/2849] Building CXX object PWGLF/Tasks/QC/CMakeFiles/O2Physicsexe-analysis-lf-mc-signal-loss.dir/mcSignalLoss.cxx.o
[1555/2849] Building CXX object PWGJE/JetFinders/CMakeFiles/O2Physicsexe-analysis-je-jet-finder-xictoxipipi-mcp-charged.dir/jetFinderXicToXiPiPiMCPCharged.cxx.o
[1556/2849] Building CXX object PWGJE/JetFinders/CMakeFiles/O2Physicsexe-analysis-je-jet-finder-v0-mcp-charged.dir/jetFinderV0MCPCharged.cxx.o
[1557/2849] Linking CXX executable stage/bin/o2-analysis-lf-mc-signal-loss
[1558/2849] Building CXX object PWGLF/Tasks/QC/CMakeFiles/O2Physicsexe-analysis-lf-its-tpc-matching-qa.dir/lfITSTPCMatchingQA.cxx.o
[1559/2849] Linking CXX executable stage/bin/o2-analysis-je-jet-finder-xictoxipipi-mcp-charged
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[1562/2849] Building CXX object PWGLF/Tasks/QC/CMakeFiles/O2Physicsexe-analysis-lf-kfperformancestudy.dir/kfPerformanceStudy.cxx.o
[1563/2849] Building CXX object PWGJE/JetFinders/CMakeFiles/O2Physicsexe-analysis-je-jet-finder-v0-mcd-charged.dir/jetFinderV0MCDCharged.cxx.o
[1564/2849] Linking CXX executable stage/bin/o2-analysis-lf-kfperformancestudy
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[1567/2849] Building CXX object PWGJE/JetFinders/CMakeFiles/O2Physicsexe-analysis-je-jet-finder-dielectron-mcd-charged.dir/jetFinderDielectronMCDCharged.cxx.o
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[1569/2849] Linking CXX executable stage/bin/o2-analysis-je-jet-finder-dielectron-mcd-charged
[1570/2849] Building CXX object PWGLF/Tasks/QC/CMakeFiles/O2Physicsexe-analysis-lf-lfpropstudy.dir/lfpropStudy.cxx.o
[1571/2849] Building CXX object PWGLF/Tasks/QC/CMakeFiles/O2Physicsexe-analysis-lf-vertexqa.dir/vertexQA.cxx.o
[1572/2849] Building CXX object PWGJE/JetFinders/CMakeFiles/O2Physicsexe-analysis-je-jet-finder-d0d0bar-data-charged.dir/jetFinderD0D0BarDataCharged.cxx.o
[1573/2849] Linking CXX executable stage/bin/o2-analysis-lf-lfpropstudy
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[1576/2849] Building CXX object PWGLF/Tasks/QC/CMakeFiles/O2Physicsexe-analysis-lf-pid-qa.dir/lfpidqa.cxx.o
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[1578/2849] Building CXX object PWGLF/Tasks/QC/CMakeFiles/O2Physicsexe-analysis-lf-strangeness-tracking-qc.dir/strangenessTrackingQC.cxx.o
[1579/2849] Linking CXX executable stage/bin/o2-analysis-lf-pid-qa
[1580/2849] Linking CXX executable stage/bin/o2-analysis-je-jet-finder-dielectron-data-charged
[1581/2849] Building CXX object PWGJE/JetFinders/CMakeFiles/O2Physicsexe-analysis-je-jet-finder-dielectron-mcp-charged.dir/jetFinderDielectronMCPCharged.cxx.o
[1582/2849] Linking CXX executable stage/bin/o2-analysis-lf-strangeness-tracking-qc
[1583/2849] Building CXX object PWGLF/Tasks/QC/CMakeFiles/O2Physicsexe-analysis-lf-strangenessqcpp.dir/strangenessQCPP.cxx.o
[1584/2849] Linking CXX executable stage/bin/o2-analysis-je-jet-finder-dielectron-mcp-charged
[1585/2849] Linking CXX executable stage/bin/o2-analysis-lf-strangenessqcpp
[1586/2849] Building CXX object PWGJE/JetFinders/CMakeFiles/O2Physicsexe-analysis-je-jet-finder-d0d0bar-mcd-charged.dir/jetFinderD0D0BarMCDCharged.cxx.o
[1587/2849] Building CXX object PWGJE/JetFinders/CMakeFiles/O2Physicsexe-analysis-je-jet-finder-d0d0bar-mcp-charged.dir/jetFinderD0D0BarMCPCharged.cxx.o
[1588/2849] Building CXX object PWGJE/JetFinders/CMakeFiles/O2Physicsexe-analysis-je-jet-finder-dplusdminus-mcd-charged.dir/jetFinderDplusDminusMCDCharged.cxx.o
[1589/2849] Building CXX object PWGLF/Tasks/QC/CMakeFiles/O2Physicsexe-analysis-lf-tpc-dedx-postcalibration.dir/tpc_dEdx_postcalibration.cxx.o
[1590/2849] Linking CXX executable stage/bin/o2-analysis-je-jet-finder-d0d0bar-mcd-charged
[1591/2849] Linking CXX executable stage/bin/o2-analysis-je-jet-finder-d0d0bar-mcp-charged
[1592/2849] Building CXX object PWGLF/Tasks/QC/CMakeFiles/O2Physicsexe-analysis-lf-mcinelgt0.dir/mcinelgt0.cxx.o
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[1594/2849] Linking CXX executable stage/bin/o2-analysis-lf-tpc-dedx-postcalibration

Full log here.

[lubynets]

@pstahlhu Since you also contributed to this code recently, can you please have a look?

Hi @vkucera, Phil had left the collaboration and probably will not look at the PR.