VBS/make_distributions_lhe_for_generator_comparison.cpp at master · AndrewLevin/VBS · GitHub

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// c++ -o checkMomentum_00 `root-config --glibs --cflags` -lm checkMomentum_00.cpp
#include "LHEF.h"
#include <iomanip>
#include <vector>
#include <iostream>
#include <string>
#include <sstream>
#include "TH1.h"
#include "TFile.h"

#include "TLorentzVector.h"

// CINT does not understand some files included by LorentzVector
#include "Math/Vector3D.h"
#include "Math/Vector4D.h"

using namespace ROOT::Math;
using namespace std ;

TLorentzVector buildP (const LHEF::HEPEUP & event, int iPart)
{
  TLorentzVector dummy ;
  dummy.SetPxPyPzE (
      event.PUP.at (iPart).at (0), // px
      event.PUP.at (iPart).at (1), // py
      event.PUP.at (iPart).at (2), // pz
      event.PUP.at (iPart).at (3) // E
    ) ;
  return dummy ;
}


int n_total_events = 0;
int n_events_with_two_leptons_and_two_quarks = 0;
int n_events_with_two_leptons_and_two_quarks_that_pass_cuts = 0;

int main(int argc, char ** argv)
{
  if(argc < 2)
    {
      cout << "Usage:   " << argv[0]
           << " input.lhe " << endl ;
      return -1;
    }

  std::ifstream ifs (argv[1]) ;
  LHEF::Reader reader (ifs) ;


  TH1F diquark_mass ("diquark_mass", "diquark_mass", 100, 0, 3000) ;
  TH1F dilepton_mass ("dilepton_mass", "dilepton_mass", 100, 0, 1000) ;
  TH1F quark_pt ("quark_pt", "quark_pt", 100, 0, 300) ;
  TH1F quark_eta ("quark_eta", "quark_eta", 100, -5, 5) ;
  TH1F lepton_pt ("lepton_pt", "lepton_pt", 100, 0, 200) ;
  TH1F lepton_eta ("lepton_eta", "lepton_eta", 100, -5, 5) ;
  TH1F lepjet_dR ("lepjet_dR", "lepjet_dR", 100, -1, 1) ;
  TH1F leplep_dR ("leplep_dR", "leplep_dR", 100, -5, 5) ;

  std::vector<TLorentzVector> electrons;

  //PG loop over input events
  while (reader.readEvent ())
    {
      n_total_events+=1;


      if ( reader.outsideBlock.length() ) std::cout << reader.outsideBlock;
	  std::vector<TLorentzVector> lepton_vector;
	  std::vector<TLorentzVector> quark_vector;

	  int n_w=0;
	  int n_quarks=0;
	  int n_leptons=0;

	  bool negative_charge_leptons = false;

      // loop over particles in the event
      for (int iPart = 0 ; iPart < reader.hepeup.IDUP.size (); ++iPart)
        {
           // outgoing particles
	  if ( reader.hepeup.ISTUP.at (iPart) == 1 )
             {

	       if (abs (reader.hepeup.IDUP.at (iPart)) == 11 || abs (reader.hepeup.IDUP.at (iPart)) == 13 || abs (reader.hepeup.IDUP.at (iPart)) == 15){

		 if (reader.hepeup.IDUP.at (iPart) > 0)
		   negative_charge_leptons=true;

		 n_leptons++;
		 TLorentzVector vec = buildP (reader.hepeup, iPart) ;
		 lepton_vector.push_back(vec);
	       }

	       if (
		   abs (reader.hepeup.IDUP.at (iPart)) == 1 || abs (reader.hepeup.IDUP.at (iPart)) == 2 || abs (reader.hepeup.IDUP.at (iPart)) == 3 ||
		   abs (reader.hepeup.IDUP.at (iPart)) == 4 || abs (reader.hepeup.IDUP.at (iPart)) == 5 || abs (reader.hepeup.IDUP.at (iPart)) == 6
		   ){

		 n_quarks++;
		 TLorentzVector vec = buildP (reader.hepeup, iPart) ;
		 quark_vector.push_back(vec);
	       }
             } // outgoing particles
        } // loop over particles in the event

      if (quark_vector.size() != 2 && lepton_vector.size() != 2)
	continue;

      //std::cout << "lepton_vector[1].Pt() = " << lepton_vector[1].Pt() << std::endl;

      n_events_with_two_leptons_and_two_quarks++;

      if (negative_charge_leptons)
	continue;

      if (lepton_vector[0].Eta() > 2.5 || lepton_vector[0].Eta() < -2.5 || lepton_vector[1].Eta() > 2.5 || lepton_vector[1].Eta() < -2.5 )
	continue;

      if ((quark_vector[0]+quark_vector[1]).M() < 100)
	continue;

      if (quark_vector[0].Pt() < 10 || quark_vector[1].Pt() < 10)
	continue;

      n_events_with_two_leptons_and_two_quarks_that_pass_cuts++;

      quark_pt.Fill(quark_vector[0].Pt());
      quark_pt.Fill(quark_vector[1].Pt());
      quark_eta.Fill(quark_vector[0].Eta());
      quark_eta.Fill(quark_vector[1].Eta());
      lepton_pt.Fill(lepton_vector[0].Pt());
      lepton_pt.Fill(lepton_vector[1].Pt());
      lepton_eta.Fill(lepton_vector[0].Eta());
      lepton_eta.Fill(lepton_vector[1].Eta());
      diquark_mass.Fill((quark_vector[0]+quark_vector[1]).M());
      dilepton_mass.Fill((lepton_vector[0] + lepton_vector[1]).M());

    } //PG loop over input events

  std::cout << "n_total_events = " << n_total_events << std::endl;
  std::cout << "n_events_with_two_leptons_and_two_quarks = " << n_events_with_two_leptons_and_two_quarks << std::endl;
  std::cout << "n_events_with_two_leptons_and_two_quarks_that_pass_cuts = " << n_events_with_two_leptons_and_two_quarks_that_pass_cuts << std::endl;

  TFile f ("output_distributions.root", "recreate") ;
  quark_pt.Write();
  quark_eta.Write();
  lepton_pt.Write();
  lepton_eta.Write();
  lepjet_dR.Write();
  leplep_dR.Write();
  diquark_mass.Write();
  dilepton_mass.Write();
  f.Close () ;

  return 0 ;
}