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File indexing completed on 2025-08-06 08:13:20
0001 /// --------------------------------------------------------------------------- 0002 /*! \file ClustTools.cc 0003 * \author Derek Anderson 0004 * \date 03.29.2024 0005 * 0006 * Collection of frequent cluster-related methods utilized 0007 * in the sPHENIX Cold QCD Energy-Energy Correlator analysis. 0008 */ 0009 /// --------------------------------------------------------------------------- 0010 0011 #define SCORRELATORUTILITIES_CLUSTTOOLS_CC 0012 0013 // namespace definition 0014 #include "ClustTools.h" 0015 0016 // make common namespaces implicit 0017 using namespace std; 0018 0019 0020 0021 // cluster methods ============================================================ 0022 0023 namespace SColdQcdCorrelatorAnalysis { 0024 0025 // -------------------------------------------------------------------------- 0026 //! Get 4-momentum for a cluster 0027 // -------------------------------------------------------------------------- 0028 ROOT::Math::PxPyPzEVector Tools::GetClustMomentum(const double energy, const ROOT::Math::XYZVector pos, const ROOT::Math::XYZVector vtx) { 0029 0030 // get displacement 0031 ROOT::Math::XYZVector displace = GetDisplacement(pos, vtx); 0032 0033 // get magnitdue of 3-momentum 0034 const double magnitude = sqrt((energy * energy) - (Const::MassPion() * Const::MassPion())); 0035 0036 // now get components and return 0037 ROOT::Math::XYZVector momentum = displace.Unit() * magnitude; 0038 return ROOT::Math::PxPyPzEVector(momentum.X(), momentum.Y(), momentum.Z(), energy); 0039 0040 } // end 'GetClustMomentum(double, ROOT::Math::XYZVector)' 0041 0042 } // end SColdQcdCorrelatorAnalysis namespace 0043 0044 0045 // end ------------------------------------------------------------------------
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