PWGJE: Fix excessive use of RecoDecay::constrainAngle (#8053)

Author: vkucera

PWGJE/Core/JetUtilities.h

@@ -141,7 +141,7 @@ std::tuple<std::vector<std::vector<int>>, std::vector<std::vector<int>>> MatchCl
 template <typename T, typename U>
 float deltaR(T const& A, U const& B)
 {
-  float dPhi = RecoDecay::constrainAngle(RecoDecay::constrainAngle(A.phi(), -M_PI) - RecoDecay::constrainAngle(B.phi(), -M_PI), -M_PI);
+  float dPhi = RecoDecay::constrainAngle(A.phi() - B.phi(), -M_PI);
   float dEta = A.eta() - B.eta();
 
   return std::sqrt(dEta * dEta + dPhi * dPhi);
@@ -150,7 +150,7 @@ float deltaR(T const& A, U const& B)
 template <typename T, typename U, typename V, typename W>
 float deltaR(T const& eta1, U const& phi1, V const& eta2, W const& phi2)
 {
-  float dPhi = RecoDecay::constrainAngle(RecoDecay::constrainAngle(phi1, -M_PI) - RecoDecay::constrainAngle(phi2, -M_PI), -M_PI);
+  float dPhi = RecoDecay::constrainAngle(phi1 - phi2, -M_PI);
   float dEta = eta1 - eta2;
 
   return std::sqrt(dEta * dEta + dPhi * dPhi);

PWGJE/Tasks/jetTutorial.cxx

@@ -313,7 +313,7 @@ struct JetTutorialTask {
       return;
     }
     for (auto& jet : jets) {
-      if (TMath::Abs(RecoDecay::constrainAngle(RecoDecay::constrainAngle(jet.phi(), -o2::constants::math::PIHalf) - RecoDecay::constrainAngle(leadingTrackPhi, -o2::constants::math::PIHalf), -o2::constants::math::PIHalf) > 0.6)) {
+      if (std::abs(RecoDecay::constrainAngle(jet.phi() - leadingTrackPhi, -o2::constants::math::PIHalf) > 0.6)) {
         registry.fill(HIST("h_recoil_jet_pt"), jet.pt());
         registry.fill(HIST("h_recoil_jet_eta"), jet.eta());
         registry.fill(HIST("h_recoil_jet_phi"), jet.phi());