[PWGEM,Photon] Add new task: task-photon-flow

- Add new task task-photon-flow to analyse photon flow with PCM via Kappa or EMCal via M02 as function of pT and centrality
- Add Kappa histograms to pcmQC
- Add new function to obtain Kappa from two legs
- Replace all `typename` with concepts in `pcmQC.cxx`
- Add two new functions: `fillKappaRec` and `fillKappaMC` which fill the Kappa histograms
- Remove Preslice template argument by reducing Preslice definition to the most basic type `Preslice<aod::V0KFEMEventIds>`
- Replace `o2::math_utils::bringTo02Pi` with `RecoDecay::constrainAngle` in `pcmQC.cxx`
- Rename function `process` to `processRec` just to make sure the Framework does not make anything funny because of the name of the function being just `process`

Author: mhemmer-cern

PWGEM/PhotonMeson/Core/V0PhotonCandidate.h

@@ -89,8 +89,8 @@ struct V0PhotonCandidate {
     dcaXYV0ToPV = RecoDecay::sqrtSumOfSquares(dcaXV0ToPV, dcaYV0ToPV) * tmpSign;
     dcaZV0ToPV = (v0DecayVtx.GetZ() - v0DecayVtx.GetPz() * cospa_ * length / v0mom) - collision.posZ();
 
-    alpha = v0_alpha(posPx, posPy, posPz, elePx, elePy, elePz);
-    qt = v0_qt(posPx, posPy, posPz, elePx, elePy, elePz);
+    alpha = v0Alpha(posPx, posPy, posPz, elePx, elePy, elePz);
+    qt = v0Qt(posPx, posPy, posPz, elePx, elePy, elePz);
 
     cospa = cospa_;
     cospaRZ = cospaRZ_;

PWGEM/PhotonMeson/TableProducer/skimmerGammaCalo.cxx

@@ -75,7 +75,7 @@ struct SkimmerGammaCalo {
   Configurable<float> minE{"minE", 0.5, "Minimum energy for energy cut"};
   Configurable<float> maxE{"maxE", std::numeric_limits<uint16_t>::max(), "Maximum energy for energy cut"};
   Configurable<bool> removeExotic{"removeExotic", false, "Flag to enable the removal of exotic clusters."};
-  Configurable<std::vector<int>> clusterDefinitions{"clusterDefinitions", {0, 1, 2, 10, 11, 12, 13, 20, 21, 22, 30, 40, 41, 42, 43, 44, 45}, "Cluster definitions to be accepted (e.g. 13 for kV3MostSplitLowSeed)"};
+  Configurable<std::vector<int>> clusterDefinitions{"clusterDefinitions", {0, 1, 2, 10, 11, 12, 13, 20, 21, 22, 30, 40, 41, 42, 43, 44, 45}, "Cluster definitions storageID to be accepted (see O2Physics/PWGJE/DataModel/EMCALClusters.h for the storageID)"};
   Configurable<float> maxdEta{"maxdEta", 0.1, "Set a maximum difference in eta for tracks and cluster to still count as matched"};
   Configurable<float> maxdPhi{"maxdPhi", 0.1, "Set a maximum difference in phi for tracks and cluster to still count as matched"};
   Configurable<float> maxEoverP{"maxEoverP", 1.5, "Set a maximum for cluster E / track p for track matching."};
@@ -93,8 +93,8 @@ struct SkimmerGammaCalo {
                  << "cluster table and must not be enabled together — this doubles MinClusters rows "
                  << "relative to EMCClusterMCLabels_001.";
     }
-    historeg.add("DefinitionIn", "Cluster definitions before cuts;#bf{Cluster definition};#bf{#it{N}_{clusters}}", HistType::kTH1F, {{51, -0.5, 50.5}});
-    historeg.add("DefinitionOut", "Cluster definitions after cuts;#bf{Cluster definition};#bf{#it{N}_{clusters}}", HistType::kTH1F, {{51, -0.5, 50.5}});
+    historeg.add("DefinitionIn", "Cluster definitions before cuts;#bf{Cluster definition};#bf{#it{N}_{clusters}}", HistType::kTH1F, {{53, -0.5, 52.5}});
+    historeg.add("DefinitionOut", "Cluster definitions after cuts;#bf{Cluster definition};#bf{#it{N}_{clusters}}", HistType::kTH1F, {{53, -0.5, 52.5}});
     historeg.add("EIn", "Energy of clusters before cuts", gHistoSpecClusterE);
     historeg.add("EOut", "Energy of clusters after cuts", gHistoSpecClusterE);
     historeg.add("MTEtaPhiBeforeTM", "Eta phi of matched tracks before TM cuts", gHistoSpecClusterTMdEtadPhi);

PWGEM/PhotonMeson/Tasks/CMakeLists.txt

@@ -126,6 +126,11 @@ o2physics_add_dpl_workflow(check-mc-v0
                     PUBLIC_LINK_LIBRARIES O2::Framework O2::DCAFitter O2Physics::AnalysisCore
                     COMPONENT_NAME Analysis)
 
+o2physics_add_dpl_workflow(task-photon-flow
+                    SOURCES taskPhotonFlow.cxx
+                    PUBLIC_LINK_LIBRARIES O2::Framework O2::EMCALBase O2::EMCALCalib O2Physics::AnalysisCore O2Physics::PWGEMPhotonMesonCore
+                    COMPONENT_NAME Analysis)
+
 o2physics_add_dpl_workflow(pi0-flow-emc
                     SOURCES taskPi0FlowEMC.cxx
                     PUBLIC_LINK_LIBRARIES O2::Framework O2::EMCALBase O2::EMCALCalib O2Physics::AnalysisCore O2Physics::PWGEMPhotonMesonCore