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task_3_2.C
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#include "common.h"
void task_3_2()
{
using namespace RooFit;
uint cate = 2;
double pt_min = 20.0;
double pt_max = 30.0;
double eta_min = 0.;
double eta_max = 2.5;
RooRealVar m("m","",5.0,5.8);
RooRealVar wgt("wgt","",1.,0.,1000.);
RooDataSet *rds_data = new RooDataSet("rds_data","",RooArgSet(m,wgt),"wgt");
RooDataSet *rds_mc = new RooDataSet("rds_mc","",RooArgSet(m));
TFile *fin = new TFile("/eos/uscms/store/user/cmsdas/2025/long_exercises/long-ex-bs-mumu/bspsiphiData.root");
TTree *tin = (TTree*)fin->Get("bspsiphiData");
uint cate_t;
float wgt_t,m_t,pt_t,eta_t;
tin->SetBranchAddress("cate",&cate_t);
tin->SetBranchAddress("wgt",&wgt_t);
tin->SetBranchAddress("m",&m_t);
tin->SetBranchAddress("pt",&pt_t);
tin->SetBranchAddress("eta",&eta_t);
for(int evt=0; evt<tin->GetEntries(); evt++) {
tin->GetEntry(evt);
if (cate_t!=cate) continue;
if (m_t<5.0 || m_t>=5.8) continue;
if (pt_t<pt_min || pt_t>=pt_max) continue;
if (fabs(eta_t)<eta_min || fabs(eta_t)>=eta_max) continue;
m.setVal(m_t);
wgt.setVal(wgt_t);
rds_data->add(RooArgSet(m,wgt),wgt_t);
}
delete fin;
fin = new TFile("/eos/uscms/store/user/cmsdas/2025/long_exercises/long-ex-bs-mumu/bspsiphiMc.root");
tin = (TTree*)fin->Get("bspsiphiMc");
tin->SetBranchAddress("cate",&cate_t);
tin->SetBranchAddress("m",&m_t);
tin->SetBranchAddress("pt",&pt_t);
tin->SetBranchAddress("eta",&eta_t);
int evtcount[2] = {0,0};
for(int evt=0; evt<tin->GetEntries(); evt++) {
tin->GetEntry(evt);
if (cate_t!=cate) continue;
evtcount[0]++;
if (m_t<5.0 || m_t>=5.8) continue;
if (pt_t<pt_min || pt_t>=pt_max) continue;
if (fabs(eta_t)<eta_min || fabs(eta_t)>=eta_max) continue;
evtcount[1]++;
m.setVal(m_t);
rds_mc->add(RooArgSet(m));
}
double eff = (double)evtcount[1]/(double)evtcount[0];
double eff_error = sqrt(eff*(1.-eff)/(double)evtcount[0]);
delete fin;
RooRealVar sigmc_mean1("sigmc_mean1","",5.37,5.2,5.5);
RooRealVar sigmc_mean2("sigmc_mean2","",5.37,5.2,5.5);
RooRealVar sigmc_sigma1("sigmc_sigma1","",0.030,0.005,0.060);
RooRealVar sigmc_sigma2("sigmc_sigma2","",0.080,0.040,0.200);
RooRealVar sig_frac("sig_frac","",0.9,0.5,1.0);
RooGaussian sigmc_g1("sig_g1","",m,sigmc_mean1,sigmc_sigma1);
RooGaussian sigmc_g2("sig_g2","",m,sigmc_mean2,sigmc_sigma2);
RooAddPdf pdf_sigmc("pdf_sigmc","",RooArgList(sigmc_g1,sigmc_g2),RooArgList(sig_frac));
pdf_sigmc.fitTo(*rds_mc);
RooPlot *frame1 = m.frame(Title(" "),Bins(80));
rds_mc->plotOn(frame1, Name("t_rds_mc"));
pdf_sigmc.plotOn(frame1, Name("t_pdf_sigmc"), LineWidth(3));
TCanvas* canvas1 = new TCanvas("canvas1", "", 600, 600);
canvas1->SetMargin(0.15,0.06,0.13,0.07);
frame1->GetYaxis()->SetTitleOffset(1.50);
frame1->GetYaxis()->SetTitle("Entries / 0.01 GeV");
frame1->GetXaxis()->SetTitleOffset(1.15);
frame1->GetXaxis()->SetLabelOffset(0.01);
frame1->GetXaxis()->SetTitle("M(#mu#muKK) [GeV]");
frame1->GetXaxis()->SetTitleSize(0.043);
frame1->GetYaxis()->SetTitleSize(0.043);
frame1->Draw();
TLegend* leg1 = new TLegend(0.58,0.77,0.93,0.92);
leg1->SetFillStyle(0);
leg1->SetLineWidth(0);
leg1->SetHeader(Form("Category %d",cate));
leg1->AddEntry(frame1->findObject("t_rds_mc"),"Simluation","EP");
leg1->AddEntry(frame1->findObject("t_pdf_sigmc"),"Fit","L");
leg1->Draw();
canvas1->Print("task3_2a.pdf");
sigmc_mean1.setConstant(true);
sigmc_mean2.setConstant(true);
sigmc_sigma1.setConstant(true);
sigmc_sigma2.setConstant(true);
sig_frac.setConstant(true);
RooRealVar sig_shift("sig_shift","",0.,-0.02,0.02);
RooRealVar sig_scale("sig_scale","",1.,0.8,1.2);
RooAddition sig_mean1("sig_mean1","",RooArgList(sigmc_mean1,sig_shift));
RooAddition sig_mean2("sig_mean2","",RooArgList(sigmc_mean2,sig_shift));
RooProduct sig_sigma1("sig_sigma1","",RooArgList(sigmc_sigma1,sig_scale));
RooProduct sig_sigma2("sig_sigma2","",RooArgList(sigmc_sigma2,sig_scale));
RooGaussian sig_g1("sig_g1","",m,sig_mean1,sig_sigma1);
RooGaussian sig_g2("sig_g2","",m,sig_mean2,sig_sigma2);
RooAddPdf pdf_sig("pdf_sig","",RooArgList(sig_g1,sig_g2),RooArgList(sig_frac));
RooRealVar comb_coeff("comb_coeff","",-1.2,-10.,10.);
RooExponential pdf_comb("pdf_comb","",m,comb_coeff);
double n_comb_guess = rds_data->sumEntries("m>5.46||m<5.26")*0.8/0.6;
double n_sig_guess = rds_data->sumEntries("m>5.26&&m<5.46")-n_comb_guess/4.;
RooRealVar n_sig("n_sig","",n_sig_guess,0.,rds_data->sumEntries());
RooRealVar n_comb("n_comb","",n_comb_guess,0.,rds_data->sumEntries());
RooAddPdf model("model","",RooArgList(pdf_sig,pdf_comb),RooArgList(n_sig,n_comb));
model.fitTo(*rds_data, SumW2Error(true));
RooPlot *frame2 = m.frame(Title(" "),Bins(80));
rds_data->plotOn(frame2, Name("t_rds_data"));
model.plotOn(frame2, Name("t_model"), LineWidth(3));
model.plotOn(frame2, Name("t_pdf_comb"), Components("pdf_comb"), LineWidth(3), LineStyle(2), LineColor(kGray+1));
TCanvas* canvas2 = new TCanvas("canvas2", "", 600, 600);
canvas2->SetMargin(0.15,0.06,0.13,0.07);
frame2->GetYaxis()->SetTitleOffset(1.50);
frame2->GetYaxis()->SetTitle("Entries / 0.01 GeV");
frame2->GetXaxis()->SetTitleOffset(1.15);
frame2->GetXaxis()->SetLabelOffset(0.01);
frame2->GetXaxis()->SetTitle("M(#mu#muKK) [GeV]");
frame2->GetXaxis()->SetTitleSize(0.043);
frame2->GetYaxis()->SetTitleSize(0.043);
frame2->Draw();
TLegend* leg2 = new TLegend(0.58,0.77,0.93,0.92);
leg2->SetFillStyle(0);
leg2->SetLineWidth(0);
leg2->SetHeader(Form("Category %d",cate));
leg2->AddEntry(frame2->findObject("t_rds_data"),"Data","EP");
leg2->AddEntry(frame2->findObject("t_model"),"Fit","L");
leg2->AddEntry(frame2->findObject("t_pdf_comb"),"Combinatorial bkg.","L");
leg2->Draw();
canvas2->Print("task3_2b.pdf");
cout << "Category: " << cate << endl;
cout << "pt range: " << pt_min << ", " << pt_max << endl;
cout << "|eta| range: " << eta_min << ", " << eta_max << endl;
cout << "Selection efficiency: " << eff << " +- " << eff_error << endl;
cout << "Observed yield: " << n_sig.getVal() << " +- " << n_sig.getError() << endl;
}