From 58b14281d9968078f35048db956c884adf9477cd Mon Sep 17 00:00:00 2001
From: Martijn Laarhoven <94106121+MartijnLaarhoven@users.noreply.github.com>
Date: Fri, 19 Dec 2025 22:23:43 +0100
Subject: [PATCH] Adding option to reject part of the FT0 detectors

Adding the option to reject the inner of the outer part of the FT0 detectors
---
 .../Tasks/longRangeDihadronCor.cxx             | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/PWGCF/TwoParticleCorrelations/Tasks/longRangeDihadronCor.cxx b/PWGCF/TwoParticleCorrelations/Tasks/longRangeDihadronCor.cxx
index 625317caa0b..a4adbcfd03f 100644
--- a/PWGCF/TwoParticleCorrelations/Tasks/longRangeDihadronCor.cxx
+++ b/PWGCF/TwoParticleCorrelations/Tasks/longRangeDihadronCor.cxx
@@ -107,6 +107,10 @@ struct LongRangeDihadronCor {
   O2_DEFINE_CONFIGURABLE(cfgLocalEfficiency, bool, false, "Use local efficiency object")
   O2_DEFINE_CONFIGURABLE(cfgUseEventWeights, bool, false, "Use event weights for mixed event")
   O2_DEFINE_CONFIGURABLE(cfgDrawEtaPhiDis, bool, false, "draw eta-phi distribution for detectors in used")
+  O2_DEFINE_CONFIGURABLE(cfgRejectFT0AInside, bool, false, "Rejection of inner ring channels of the FT0A detector")
+  O2_DEFINE_CONFIGURABLE(cfgRejectFT0AOutside, bool, false, "Rejection of outer ring channels of the FT0A detector")
+  O2_DEFINE_CONFIGURABLE(cfgRejectFT0CInside, bool, false, "Rejection of inner ring channels of the FT0C detector")
+  O2_DEFINE_CONFIGURABLE(cfgRejectFT0COutside, bool, false, "Rejection of outer ring channels of the FT0C detector")
   struct : ConfigurableGroup {
     O2_DEFINE_CONFIGURABLE(cfgMultCentHighCutFunction, std::string, "[0] + [1]*x + [2]*x*x + [3]*x*x*x + [4]*x*x*x*x + 10.*([5] + [6]*x + [7]*x*x + [8]*x*x*x + [9]*x*x*x*x)", "Functional for multiplicity correlation cut");
     O2_DEFINE_CONFIGURABLE(cfgMultCentLowCutFunction, std::string, "[0] + [1]*x + [2]*x*x + [3]*x*x*x + [4]*x*x*x*x - 3.*([5] + [6]*x + [7]*x*x + [8]*x*x*x + [9]*x*x*x*x)", "Functional for multiplicity correlation cut");
@@ -236,6 +240,16 @@ struct LongRangeDihadronCor {
     kTOF,
     kITS
   };
+  enum DetectorChannels {
+    kFT0AInnerRingMin = 0,
+    kFT0AInnerRingMax = 31,
+    kFT0AOuterRingMin = 32,
+    kFT0AOuterRingMax = 95,
+    kFT0CInnerRingMin = 96,
+    kFT0CInnerRingMax = 143,
+    kFT0COuterRingMin = 144,
+    kFT0COuterRingMax = 207
+  };
   std::array<float, 6> tofNsigmaCut;
   std::array<float, 6> itsNsigmaCut;
   std::array<float, 6> tpcNsigmaCut;
@@ -639,12 +653,16 @@ struct LongRangeDihadronCor {
       id = ft0.channelC()[iCh];
       id = id + Ft0IndexA;
       ampl = ft0.amplitudeC()[iCh];
+      if ((cfgRejectFT0CInside && (id >= kFT0CInnerRingMin && id <= kFT0CInnerRingMax)) || (cfgRejectFT0COutside && (id >= kFT0COuterRingMin && id <= kFT0COuterRingMax)))
+        ampl = 0.;
       registry.fill(HIST("FT0Amp"), id, ampl);
       ampl = ampl / cstFT0RelGain[iCh];
       registry.fill(HIST("FT0AmpCorrect"), id, ampl);
     } else if (fitType == kFT0A) {
       id = ft0.channelA()[iCh];
       ampl = ft0.amplitudeA()[iCh];
+      if ((cfgRejectFT0AInside && (id >= kFT0AInnerRingMin && id <= kFT0AInnerRingMax)) || (cfgRejectFT0AOutside && (id >= kFT0AOuterRingMin && id <= kFT0AOuterRingMax)))
+        ampl = 0.;
       registry.fill(HIST("FT0Amp"), id, ampl);
       ampl = ampl / cstFT0RelGain[iCh];
       registry.fill(HIST("FT0AmpCorrect"), id, ampl);