#include "iostream"
#include <TH1F.h>
#include <TStyle.h>
#include <TCanvas.h>
#include <TLorentzVector.h>
#include <TClonesArray.h>
#include "TFile.h"
#include "TTree.h"
#include "TTreeReader.h"
#include "TTreeReaderValue.h"
#include "TTreeReaderArray.h"
using namespace std;
void tests(){
TFile *hfile = new TFile("unweighted.root","read");
TTree *LHEF=(TTree*)hfile->Get("LHEF");
nen = LHEF->GetEntries();
LHEF->Show();
TH1F *invm = new TH1F("H_invmass","GeV",100,0,150);
TTreeReader reader("LHEF",hfile);
TTreeReaderArray<double> ParticleM(reader,"Particle.M");
while (reader.Next())
{       
        Double_t k = ParticleM;
	invm->Fill(k);
}
invm->Draw();
}