[PWGJE] Fix leading-jet selection (Rec) and event normalization

[arvindkhuntia]

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[github-actions]

O2 linter results: ❌ 0 errors, ⚠️ 58 warnings, 🔕 0 disabled

[alibuild]

Error while checking build/O2Physics/staging for 778a227 at 2026-09-24 21:55:

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[alibuild]

Error while checking build/O2Physics/o2 for 778a227 at 2026-09-24 21:56:

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[alibuild]

Error while checking build/O2Physics/code-check for 778a227 at 2026-09-24 21:57:

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[nzardosh]

instead of mcdjet.pt() shouldnt you be checking the jet pT after background subtraction here? you can use a conditional statement like this:

const float mcdJetPtForResponseSel = usebkgSubractionMC ? mcdjet.pt() - backgroundRho * jetArea : mcdjet.pt();
if (isConeAxisAccepted(mcdjet.eta()) && mcdJetPtForResponseSel > leadingDetJetPt) {
leadingDetJetPt = mcdJetPtForResponseSel;
leadingDetJetId = mcdjet.globalIndex();
}

[arvindkhuntia]

Many thanks, @nzardosh, for the suggestion. The background-subtracted p_T cut is already applied later in the matching loop. I’ve now also used the corrected p_T to select the leading detector jet and added an early rejection of \rho < 0 when subtraction is enabled, avoiding unnecessary further processing for those events. Have a nice day.