[PWGCF] FemtoUniverse: Add flag to select circular or square deta-dphi cut (#13549)

Co-authored-by: ALICE Action Bot <alibuild@cern.ch>

Author: prchakra

PWGCF/FemtoUniverse/Core/FemtoUniverseDetaDphiStar.h

@@ -562,7 +562,7 @@ class FemtoUniverseDetaDphiStar
 
   ///  Check if pair is close or not
   template <typename Part>
-  bool isClosePairFrac(Part const& part1, Part const& part2, float lmagfield, uint8_t ChosenEventType, bool IsDphiAvgOrDist, float DistMax, float FracMax)
+  bool isClosePairFrac(Part const& part1, Part const& part2, float lmagfield, uint8_t ChosenEventType, bool IsDphiAvgOrDist, float DistMax, float FracMax, bool CircCut)
   {
     magfield = lmagfield;
 
@@ -585,7 +585,9 @@ class FemtoUniverseDetaDphiStar
       }
 
       if (IsDphiAvgOrDist) {
-        if ((dphiAvg > cutDeltaPhiStarMin) && (dphiAvg < cutDeltaPhiStarMax) && (deta > cutDeltaEtaMin) && (deta < cutDeltaEtaMax)) {
+        if (CircCut && (std::pow(dphiAvg, 2) / std::pow(cutDeltaPhiStarMax, 2) + std::pow(deta, 2) / std::pow(cutDeltaEtaMax, 2) < 1.)) {
+          return true;
+        } else if (!CircCut && (dphiAvg > cutDeltaPhiStarMin) && (dphiAvg < cutDeltaPhiStarMax) && (deta > cutDeltaEtaMin) && (deta < cutDeltaEtaMax)) {
           return true;
         } else {
           if (ChosenEventType == femto_universe_container::EventType::same) {

PWGCF/FemtoUniverse/Tasks/femtoUniversePairTaskTrackTrackSpherHarMultKtExtended.cxx

@@ -201,6 +201,7 @@ struct femtoUniversePairTaskTrackTrackSpherHarMultKtExtended {
   Configurable<float> confCPRFracMax{"confCPRFracMax", 0.0, "Max. allowed fraction bad to all TPC points of radial seperation between two closed-pairs"};
   Configurable<bool> confCPRIsAtITS{"confCPRIsAtITS", false, "Close Pair Rejection at ITS or TPC"};
   Configurable<bool> confCPRDphiAvgOrDist{"confCPRDphiAvgOrDist", true, "Close Pair Rejection by radial or angular seperation"};
+  Configurable<bool> confIsCircularCut{"confIsCircularCut", true, "Close Pair Rejection by circular cut"};
 
   FemtoUniverseSHContainer<femto_universe_sh_container::EventType::same, femto_universe_sh_container::Observable::kstar> sameEventCont;
   FemtoUniverseSHContainer<femto_universe_sh_container::EventType::mixed, femto_universe_sh_container::Observable::kstar> mixedEventCont;
@@ -521,7 +522,7 @@ struct femtoUniversePairTaskTrackTrackSpherHarMultKtExtended {
               continue;
             }
           } else {
-            if (pairCloseRejection.isClosePairFrac(p1, p2, magFieldTesla, femto_universe_container::EventType::same, confCPRDphiAvgOrDist, confCPRDistMax, confCPRFracMax)) {
+            if (pairCloseRejection.isClosePairFrac(p1, p2, magFieldTesla, femto_universe_container::EventType::same, confCPRDphiAvgOrDist, confCPRDistMax, confCPRFracMax, confIsCircularCut)) {
               continue;
             }
           }
@@ -551,7 +552,7 @@ struct femtoUniversePairTaskTrackTrackSpherHarMultKtExtended {
               continue;
             }
           } else {
-            if (pairCloseRejection.isClosePairFrac(p1, p2, magFieldTesla, femto_universe_container::EventType::same, confCPRDphiAvgOrDist, confCPRDistMax, confCPRFracMax)) {
+            if (pairCloseRejection.isClosePairFrac(p1, p2, magFieldTesla, femto_universe_container::EventType::same, confCPRDphiAvgOrDist, confCPRDistMax, confCPRFracMax, confIsCircularCut)) {
               continue;
             }
           }
@@ -872,7 +873,7 @@ struct femtoUniversePairTaskTrackTrackSpherHarMultKtExtended {
             continue;
           }
         } else {
-          if (pairCloseRejection.isClosePairFrac(p1, p2, magFieldTesla, femto_universe_container::EventType::mixed, confCPRDphiAvgOrDist, confCPRDistMax, confCPRFracMax)) {
+          if (pairCloseRejection.isClosePairFrac(p1, p2, magFieldTesla, femto_universe_container::EventType::mixed, confCPRDphiAvgOrDist, confCPRDistMax, confCPRFracMax, confIsCircularCut)) {
             continue;
           }
         }