[PWGJE] Update code after physics forum

[KotliarovAr]

The main update relates to adding the rho shift in events with TTRef. The rho shift is estimated as the average difference between rho values in events with TTSig and TTRef.

Minor changes:

• remove unused histograms
• adjust default values of the configurables

[github-actions]

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

[nzardosh]

can you check the megalinter error about shadowed variables please?

[alibuild]

Error while checking build/O2Physics/code-check for d15aefd at 2026-08-13 08:28:

## sw/BUILD/O2Physics-code-check-latest/log
--
========== List of issues found ==========
++ echo 'Found 14 errors and 55 warnings.'
Found 14 errors and 55 warnings.
++ [[ 14 -gt 0 ]]
++ cat /sw/BUILD/11868e2d58156d1cb0eb548ee3a51733069b0363/O2Physics-code-check/errors.txt
PWGJE/Tasks/recoilJets.cxx:101:8: error: constructor does not initialize these fields: pdg [cppcoreguidelines-pro-type-member-init,-warnings-as-errors]
PWGJE/Tasks/recoilJets.cxx:241:23: error: member 'axis' of type 'const AxisObject &' is a reference [cppcoreguidelines-avoid-const-or-ref-data-members,-warnings-as-errors]
PWGJE/Tasks/recoilJets.cxx:241:23: error: member 'axis' of type 'const o2::framework::AxisSpec &' is a reference [cppcoreguidelines-avoid-const-or-ref-data-members,-warnings-as-errors]
PWGJE/Tasks/recoilJets.cxx:241:23: error: member 'axis' of type 'const o2::framework::Configurable<std::vector<double>, o2::framework::kAxisSpec> &' is a reference [cppcoreguidelines-avoid-const-or-ref-data-members,-warnings-as-errors]
PWGJE/Tasks/recoilJets.cxx:289:35: error: member 'eaRhoShifts' of type 'const std::array<EARhoShift, 7>' is const qualified [cppcoreguidelines-avoid-const-or-ref-data-members,-warnings-as-errors]
PWGJE/Tasks/recoilJets.cxx:289:48: error: use designated initializer list to initialize 'EARhoShift' [modernize-use-designated-initializers,-warnings-as-errors]
PWGJE/Tasks/recoilJets.cxx:290:48: error: use designated initializer list to initialize 'EARhoShift' [modernize-use-designated-initializers,-warnings-as-errors]
PWGJE/Tasks/recoilJets.cxx:291:48: error: use designated initializer list to initialize 'EARhoShift' [modernize-use-designated-initializers,-warnings-as-errors]
PWGJE/Tasks/recoilJets.cxx:292:48: error: use designated initializer list to initialize 'EARhoShift' [modernize-use-designated-initializers,-warnings-as-errors]
PWGJE/Tasks/recoilJets.cxx:293:48: error: use designated initializer list to initialize 'EARhoShift' [modernize-use-designated-initializers,-warnings-as-errors]
PWGJE/Tasks/recoilJets.cxx:294:48: error: use designated initializer list to initialize 'EARhoShift' [modernize-use-designated-initializers,-warnings-as-errors]
PWGJE/Tasks/recoilJets.cxx:295:48: error: use designated initializer list to initialize 'EARhoShift' [modernize-use-designated-initializers,-warnings-as-errors]
PWGJE/Tasks/recoilJets.cxx:2679:9: error: the 'empty' method should be used to check for emptiness instead of 'size' [readability-container-size-empty,-warnings-as-errors]
PWGJE/Tasks/recoilJets.cxx:2847:11: error: the 'empty' method should be used to check for emptiness instead of 'size' [readability-container-size-empty,-warnings-as-errors]
++ [[ 55 -gt 0 ]]
++ cat /sw/BUILD/11868e2d58156d1cb0eb548ee3a51733069b0363/O2Physics-code-check/warnings.txt
PWGJE/Tasks/recoilJets.cxx:1322:27: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Tasks/recoilJets.cxx:1354:28: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Tasks/recoilJets.cxx:1455:52: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Tasks/recoilJets.cxx:1530:71: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Tasks/recoilJets.cxx:1618:27: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Tasks/recoilJets.cxx:1641:34: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Tasks/recoilJets.cxx:2373:84: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Tasks/recoilJets.cxx:2438:37: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Tasks/recoilJets.cxx:2440:9: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Tasks/recoilJets.cxx:2460:28: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Tasks/recoilJets.cxx:2483:30: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Tasks/recoilJets.cxx:2531:28: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Tasks/recoilJets.cxx:2586:32: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Tasks/recoilJets.cxx:2608:30: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Tasks/recoilJets.cxx:2661:32: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Tasks/recoilJets.cxx:2691:32: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Tasks/recoilJets.cxx:2735:34: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Tasks/recoilJets.cxx:2791:38: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Tasks/recoilJets.cxx:2813:36: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Tasks/recoilJets.cxx:2879:38: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Tasks/recoilJets.cxx:2915:27: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Tasks/recoilJets.cxx:2953:25: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Tasks/recoilJets.cxx:2957:26: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Tasks/recoilJets.cxx:2989:25: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Tasks/recoilJets.cxx:3038:35: warning: statement should be inside braces [readability-braces-around-statements]
PWGJE/Tasks/recoilJets.cxx:3084:26: warning: statement should be inside braces [readability-braces-around-statements]
[0 more errors; see full log]

Full log here.