inclusive_detached_dilepton/old_analysis_macros/subs_mass.cpp

#include "TH1D.h"
#include "TH2D.h"
#include "THStack.h"
#include "TGraph.h"
#include "TTree.h"
#include "TChain.h"
#include "TFile.h"
#include "TCanvas.h"
#include "TROOT.h"
#include "TStyle.h"
#include "TColor.h"
#include "TLorentzVector.h"
#include "TRandom3.h"
#include "TLorentzVector.h"

#include "RooDataHist.h"
#include "RooRealVar.h"
#include "RooPlot.h"
#include "RooGaussian.h"
#include "RooExponential.h"
#include "RooRealConstant.h"
#include "RooAddPdf.h"
#include "RooFitResult.h"
#include "RooProduct.h"
#include "RooCrystalBall.h"
#include "RooBreitWigner.h"

#include <string>
#include <iostream>
#include <cmath>

const int nBins = 70;
const Double_t MASS_HIST_MIN = 4000.;
const Double_t MASS_HIST_MAX = 8500.;
const Double_t J_PSI_MASS = 3096.916;
const Double_t K_MASS = 493.677;

std::vector<RooPlot*> CreateRooFit(TH1D *hist);

bool inRange(double value, double center, double low_intvl, double up_intvl) {
    return center - low_intvl < value && value < center + up_intvl;
}

bool inRange(double value, double center, double intvl) {
    return inRange(value, center, intvl, intvl);
}

int subs_mass()
{
    // files to load
    std::vector<std::string> data_filenames =
        {
            "/auto/data/pfeiffer/inclusive_detached_dilepton/data_samples/spruce_magdown_2023_v0r1_tuple_90000000_2023_v0r0p6288631.root"};

    TChain *data_chain = new TChain("BuToHpMuMu/DecayTree");
    for (unsigned int i = 0; i < data_filenames.size(); i++)
    {
        data_chain->Add(data_filenames.at(i).c_str());
    }

    Double_t Jpsi_M, L1_M, L2_M, Hp_M;
    Float_t L1_PX, L1_PY, L1_PZ, L1_ENERGY, L2_PX, L2_PY, L2_PZ, L2_ENERGY, Hp_PX, Hp_PY, Hp_PZ, Hp_ENERGY;

    data_chain->SetBranchAddress("Jpsi_M", &Jpsi_M);
    data_chain->SetBranchAddress("L1_M", &L1_M);
    data_chain->SetBranchAddress("L2_M", &L2_M);
    data_chain->SetBranchAddress("Hp_M", &Hp_M);
    data_chain->SetBranchAddress("L1_PX", &L1_PX);
    data_chain->SetBranchAddress("L1_PY", &L1_PY);
    data_chain->SetBranchAddress("L1_PZ", &L1_PZ);
    data_chain->SetBranchAddress("L1_ENERGY", &L1_ENERGY);
    data_chain->SetBranchAddress("L2_PX", &L2_PX);
    data_chain->SetBranchAddress("L2_PY", &L2_PY);
    data_chain->SetBranchAddress("L2_PZ", &L2_PZ);
    data_chain->SetBranchAddress("L2_ENERGY", &L2_ENERGY);
    data_chain->SetBranchAddress("Hp_PX", &Hp_PX);
    data_chain->SetBranchAddress("Hp_PY", &Hp_PY);
    data_chain->SetBranchAddress("Hp_PZ", &Hp_PZ);
    data_chain->SetBranchAddress("Hp_ENERGY", &Hp_ENERGY);

    unsigned int entries = data_chain->GetEntries();
    
    TH1D *h1_B_M = new TH1D("h1_B_M", "m(#pi_{K} #mu^{+} #mu^{-})", nBins, MASS_HIST_MIN, MASS_HIST_MAX);

    for (unsigned int i = 0; i < entries; i++)
    {
        data_chain->GetEntry(i);

        TVector3 K_momentum(Hp_PX, Hp_PY, Hp_PZ);
        double K_energy = TMath::Sqrt(TMath::Sq(K_MASS) + K_momentum.Mag2());
        TLorentzVector K_4v(K_momentum, K_energy);
        TLorentzVector l1_4v(L1_PX, L1_PY, L1_PZ, L1_ENERGY);
        TLorentzVector l2_4v(L2_PX, L2_PY, L2_PZ, L2_ENERGY);
        Double_t reconstructed_B_Mass = (K_4v + l1_4v + l2_4v).M();

        h1_B_M->Fill(reconstructed_B_Mass);
    }
    TCanvas* c1 = new TCanvas("c1", "c1", 0, 0, 900, 850);
    h1_B_M->Draw();
    c1->Draw();

    c1->SaveAs("BuToKpMuMu_incl_ap_B_M_uncut_subid.jpg");

    return 0;
}