[PWGHF] Adding D0/Lc analysis task

[laszlogyulai]

Adding a new analysis task for calculating the D0/Lambda_c yield ratio as a function of flattenicity

[github-actions]

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

[laszlogyulai]

Dear codeowners,

Is it possible to overcome the "magic number" errors in the O2 linter / O2 linter (pull_request_target) check? In my opinion it would unnecessarily complicate the existing code. You can see an example of such a solution in the PWGLF/Tasks/GlobalEventProperties/flattenicityPikp.cxx file (lines 1814-1908)

[vkucera]

Dear codeowners,

Is it possible to overcome the "magic number" errors in the O2 linter / O2 linter (pull_request_target) check? In my opinion it would unnecessarily complicate the existing code. You can see an example of such a solution in the PWGLF/Tasks/GlobalEventProperties/flattenicityPikp.cxx file (lines 1814-1908)

The way to "overcome" it is to write it in a better way. From what I can see, you map some number to other numbers. So how about using a map or an array, for example?

[laszlogyulai]

@zhangbiao-phy @vkucera I have updated my local installation of O2Physics, and now the code is compiling and running on the latest version as well. In the end, it was missing the recent addition of the PVMults table to the HF codes. Thank you for your guidance in figuring everything out.

[alibuild]

Error while checking build/O2Physics/staging for fa93653 at 2026-09-23 16:55:

No log files found

Full log here.

[alibuild]

Error while checking build/O2Physics/o2 for fa93653 at 2026-09-23 16:56:

No log files found

Full log here.

[alibuild]

Error while checking build/O2Physics/code-check for fa93653 at 2026-09-24 07:29:

## sw/BUILD/O2-latest/log
Error: missing ; at end of rule at /sw/SOURCES/O2/daily-20260923-0000/daily-20260923-0000/Detectors/TPC/base/src/TPCBaseLinkDef.h:75:56
Error: missing ; at end of rule at /sw/SOURCES/O2/daily-20260923-0000/daily-20260923-0000/Detectors/TPC/base/src/TPCBaseLinkDef.h:83:135
Error: missing ; at end of rule at /sw/SOURCES/O2/daily-20260923-0000/daily-20260923-0000/Detectors/TPC/base/src/TPCBaseLinkDef.h:84:135
Error: missing ; at end of rule at /sw/SOURCES/O2/daily-20260923-0000/daily-20260923-0000/Detectors/Upgrades/ALICE3/ECal/base/src/ECalBaseLinkDef.h:19:48
Error: missing ; at end of rule at /sw/SOURCES/O2/daily-20260923-0000/daily-20260923-0000/Detectors/Upgrades/ALICE3/RICH/base/src/RICHBaseLinkDef.h:18:48
Error: missing ; at end of rule at /sw/SOURCES/O2/daily-20260923-0000/daily-20260923-0000/Detectors/Upgrades/ALICE3/MID/base/src/MI3BaseLinkDef.h:18:47


## sw/BUILD/O2Physics-code-check-latest/log
--
========== List of issues found ==========
++ echo 'Found 24 errors and 5 warnings.'
Found 24 errors and 5 warnings.
++ [[ 24 -gt 0 ]]
++ cat /sw/BUILD/859d40414852a10cd6081743df46696d67978a8a/O2Physics-code-check/errors.txt
PWGHF/D2H/Tasks/taskFlattenicityD0Lc.cxx:26:1: error: included header Centrality.h is not used directly [misc-include-cleaner,-warnings-as-errors]
PWGHF/D2H/Tasks/taskFlattenicityD0Lc.cxx:29:1: error: included header PIDResponseTOF.h is not used directly [misc-include-cleaner,-warnings-as-errors]
PWGHF/D2H/Tasks/taskFlattenicityD0Lc.cxx:30:1: error: included header PIDResponseTPC.h is not used directly [misc-include-cleaner,-warnings-as-errors]
PWGHF/D2H/Tasks/taskFlattenicityD0Lc.cxx:41:1: error: included header algorithm is not used directly [misc-include-cleaner,-warnings-as-errors]
PWGHF/D2H/Tasks/taskFlattenicityD0Lc.cxx:73:3: error: no header providing "o2::framework::Configurable" is directly included [misc-include-cleaner,-warnings-as-errors]
PWGHF/D2H/Tasks/taskFlattenicityD0Lc.cxx:86:3: error: no header providing "o2::framework::Service" is directly included [misc-include-cleaner,-warnings-as-errors]
PWGHF/D2H/Tasks/taskFlattenicityD0Lc.cxx:100:68: error: no header providing "uint8_t" is directly included [misc-include-cleaner,-warnings-as-errors]
PWGHF/D2H/Tasks/taskFlattenicityD0Lc.cxx:100:77: error: no header providing "BIT" is directly included [misc-include-cleaner,-warnings-as-errors]
PWGHF/D2H/Tasks/taskFlattenicityD0Lc.cxx:108:3: error: no header providing "o2::framework::Partition" is directly included [misc-include-cleaner,-warnings-as-errors]
PWGHF/D2H/Tasks/taskFlattenicityD0Lc.cxx:111:3: error: no header providing "o2::framework::ConfigurableAxis" is directly included [misc-include-cleaner,-warnings-as-errors]
PWGHF/D2H/Tasks/taskFlattenicityD0Lc.cxx:126:13: error: no header providing "o2::framework::InitContext" is directly included [misc-include-cleaner,-warnings-as-errors]
PWGHF/D2H/Tasks/taskFlattenicityD0Lc.cxx:155:231: error: no header providing "o2::constants::math::TwoPI" is directly included [misc-include-cleaner,-warnings-as-errors]
PWGHF/D2H/Tasks/taskFlattenicityD0Lc.cxx:438:3: error: no header providing "PROCESS_SWITCH" is directly included [misc-include-cleaner,-warnings-as-errors]
PWGHF/D2H/Tasks/taskFlattenicityD0Lc.cxx:602:45: error: no header providing "THnSparse" is directly included [misc-include-cleaner,-warnings-as-errors]
PWGHF/D2H/Tasks/taskFlattenicityD0Lc.cxx:645:28: error: no header providing "RecoDecay" is directly included [misc-include-cleaner,-warnings-as-errors]
PWGHF/D2H/Tasks/taskFlattenicityD0Lc.cxx:645:180: error: no header providing "o2::constants::physics::Pdg" is directly included [misc-include-cleaner,-warnings-as-errors]
PWGHF/D2H/Tasks/taskFlattenicityD0Lc.cxx:648:84: error: no header providing "o2::constants::physics::MassD0" is directly included [misc-include-cleaner,-warnings-as-errors]
PWGHF/D2H/Tasks/taskFlattenicityD0Lc.cxx:867:82: error: no header providing "kProton" is directly included [misc-include-cleaner,-warnings-as-errors]
PWGHF/D2H/Tasks/taskFlattenicityD0Lc.cxx:871:82: error: no header providing "kPiPlus" is directly included [misc-include-cleaner,-warnings-as-errors]
PWGHF/D2H/Tasks/taskFlattenicityD0Lc.cxx:985:78: error: no header providing "o2::constants::physics::MassLambdaCPlus" is directly included [misc-include-cleaner,-warnings-as-errors]
PWGHF/D2H/Tasks/taskFlattenicityD0Lc.cxx:1044:12: error: no header providing "std::bitset" is directly included [misc-include-cleaner,-warnings-as-errors]
PWGHF/D2H/Tasks/taskFlattenicityD0Lc.cxx:1045:46: error: no header providing "o2::fit::Triggers" is directly included [misc-include-cleaner,-warnings-as-errors]
PWGHF/D2H/Tasks/taskFlattenicityD0Lc.cxx:1047:19: error: no header providing "std::size_t" is directly included [misc-include-cleaner,-warnings-as-errors]
PWGHF/D2H/Tasks/taskFlattenicityD0Lc.cxx:1105:17: error: no header providing "std::sqrt" is directly included [misc-include-cleaner,-warnings-as-errors]
++ [[ 5 -gt 0 ]]
++ cat /sw/BUILD/859d40414852a10cd6081743df46696d67978a8a/O2Physics-code-check/warnings.txt
PWGHF/D2H/Tasks/taskFlattenicityD0Lc.cxx:67:30: warning: variable 'rhoLatticeFV0' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables]
PWGHF/D2H/Tasks/taskFlattenicityD0Lc.cxx:68:30: warning: variable 'rhoLatticeFV0Calibrated' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables]
PWGHF/D2H/Tasks/taskFlattenicityD0Lc.cxx:69:30: warning: variable 'calib' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables]
PWGHF/D2H/Tasks/taskFlattenicityD0Lc.cxx:70:20: warning: variable 'channelsToRings' is non-const and globally accessible, consider making it const [cppcoreguidelines-avoid-non-const-global-variables]
PWGHF/D2H/Tasks/taskFlattenicityD0Lc.cxx:1072:9: warning: do not use 'else' after 'return' [readability-else-after-return]
++ [[ 24 -gt 0 ]]
++ exit 1
[0 more errors; see full log]

Full log here.

[vkucera]

@laszlogyulai Please fix the errors reported by the code-check. You can reproduce (and fix) the errors by following the documentation instructions. See https://aliceo2group.github.io/analysis-framework/docs/tools/#running-with-o2physics-code-check

[vkucera]

@zhangbiao-phy Please do not merge PRs before the tests finish.

[laszlogyulai]

@zhangbiao-phy can you please test this PR?

[vkucera]

@zhangbiao-phy can you please test this PR?

What do you mean?