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[PWGLF] ptmultCorr: configurable pT-dependent DCAxy cut,fine DCAxy vs pT for sigma extraction - #18283
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…s pT for sigma extraction
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The following changes made:
-Optional pT-dependent DCAxy cut |DCAxy| < N·(A + B/pT^C); A, B, C, N configurable, off by default (cfgApplyPtDepDcaXY).
-THnSparses keep the full DCAxy distribution (template fit) and are filled exactly as before; new *DcaCut histograms (no DCAxy axis) hold the spectrum / efficiency numerator after the cut, evaluated with reco pT.