[PWGCF] FemtoUniverse: Adding pair-seperation for pair-cuts (#12090)

Author: prchakra

PWGCF/FemtoUniverse/Core/FemtoUniverseDetaDphiStar.h

@@ -169,6 +169,7 @@ class FemtoUniverseDetaDphiStar
       }
       auto deta = part1.eta() - part2.eta();
       auto dphiAvg = averagePhiStar(part1, part2, 0);
+      auto dphi = averagePhiStarFrac(part1, part2);
       if (ChosenEventType == femto_universe_container::EventType::same) {
         histdetadpisame[0][0]->Fill(deta, dphiAvg);
       } else if (ChosenEventType == femto_universe_container::EventType::mixed) {
@@ -177,7 +178,8 @@ class FemtoUniverseDetaDphiStar
         LOG(fatal) << "FemtoUniverseDetaDphiStar: passed arguments don't agree with FemtoUniverseDetaDphiStar's type of events! Please provide same or mixed.";
       }
 
-      if (std::pow(dphiAvg, 2) / std::pow(cutDeltaPhiStarMax, 2) + std::pow(deta, 2) / std::pow(cutDeltaEtaMax, 2) < 1.) {
+      // if (std::pow(dphiAvg, 2) / std::pow(cutDeltaPhiStarMax, 2) + std::pow(deta, 2) / std::pow(cutDeltaEtaMax, 2) < 1.) {
+      if (dphi > 0.02) {
         return true;
       } else {
         if (ChosenEventType == femto_universe_container::EventType::same) {
@@ -554,6 +556,36 @@ class FemtoUniverseDetaDphiStar
     return dPhiAvg / static_cast<float>(entries);
   }
 
+  ///  Calculate average phi
+  template <typename T1, typename T2>
+  float averagePhiStarFrac(const T1& part1, const T2& part2)
+  {
+    std::vector<float> tmpVec1;
+    std::vector<float> tmpVec2;
+    phiAtRadiiTPC(part1, tmpVec1);
+    phiAtRadiiTPC(part2, tmpVec2);
+    int num = tmpVec1.size();
+    float dphi = 0;
+    int entries = 0;
+    double distance = 0;
+    int badpoints = 0;
+
+    for (int i = 0; i < num; i++) {
+      if (tmpVec1.at(i) != 999 && tmpVec2.at(i) != 999) {
+        dphi = tmpVec1.at(i) - tmpVec2.at(i);
+        entries++;
+      } else {
+        dphi = 0;
+      }
+      dphi = TVector2::Phi_mpi_pi(dphi);
+      distance = 2 * TMath::Sin(TMath::Abs(dphi) * 0.5) * TmpRadiiTPC[i];
+      if (distance < 10.0) {
+        badpoints++;
+      }
+    }
+    return badpoints / entries;
+  }
+
   // Get particle charge from mask
   template <typename T1>
   float getCharge(const T1& part)