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Added option to reject the inside or the outside of the detector ring of FT0

Author: MartijnLaarhoven

PWGCF/TwoParticleCorrelations/Tasks/longRangeDihadronCor.cxx

@@ -107,6 +107,8 @@ 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(cfgRejectOutsideDetectors, bool, false, "Rejection of outside ring events of the FT0 detector")
+  O2_DEFINE_CONFIGURABLE(cfgRejectInsideDetectors, bool, false, "Rejection of inside ring events of the FT0 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");
@@ -639,12 +641,16 @@ struct LongRangeDihadronCor {
       id = ft0.channelC()[iCh];
       id = id + Ft0IndexA;
       ampl = ft0.amplitudeC()[iCh];
+      if ((cfgRejectInsideDetectors && ((id >= 31 && id <= 96) || (id >= 143 && id <= 208))) || (cfgRejectOutsideDetectors && ((id >= 0 && id <= 30) || (id >= 97 && id <= 142))))
+        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 ((cfgRejectInsideDetectors && ((id >= 31 && id <= 96) || (id >= 143 && id <= 208))) || (cfgRejectOutsideDetectors && ((id >= 0 && id <= 30) || (id >= 97 && id <= 142))))
+        ampl = 0.;
       registry.fill(HIST("FT0Amp"), id, ampl);
       ampl = ampl / cstFT0RelGain[iCh];
       registry.fill(HIST("FT0AmpCorrect"), id, ampl);