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LcPlusMinus.C
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LcPlusMinus.C
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/* ************************************************** *
* Not so simple macro for plotting of invarant mass *
* of the Lambda_c baryon from an ntuple *
* ************************************************** */
#include <iostream>
#include <cmath>
#include "TStyle.h"
#include "TCanvas.h"
#include "TH1D.h"
#include "TFile.h"
#include "TNtuple.h"
#include "TCut.h"
#include "TF1.h"
#include "TLegend.h"
#include "TColor.h"
#include "TROOT.h"
#include "TText.h"
#include "TString.h"
using std::cout;
using std::endl;
void LcPlusMinus()
{
gStyle->SetOptStat(0);
gStyle->SetLabelFont(132, "x");
gStyle->SetLabelFont(132, "y");
gStyle->SetTitleFont(132, "x");
gStyle->SetTitleFont(132, "y");
gStyle->SetLegendFont(132);
TFile *f = new TFile("centralityWeightpicoHFLambdaCMaker.root");
TNtuple *secondary = static_cast<TNtuple*>(f->Get("secondary"));
TCanvas *C = new TCanvas("C", "mass plot", 500, 500);
TH1D* sig = new TH1D("sig", "", 40, 2.1, 2.5);
TH1D* bkg = new TH1D("bkg", "", 40, 2.1, 2.5);
sig->Sumw2();
bkg->Sumw2();
// -- set cuts
const int LcPlus = (0 <<2) | (1 <<1) | 1; // K,p,pi
const int LcMinus = (1 <<2) | (0 <<1) | 0;
TCut sigCut = Form("charges == %d || charges == %d", LcPlus, LcMinus);
TCut LcPlusCut = Form("charges == %d", LcPlus);
TCut LcMinusCut = Form("charges == %d", LcMinus);
const int protonMap = 1 <<1;
TCut protonCut = Form("(charges & %d) != 0", protonMap);
TCut centralityCut = "centrality > 0.1 && centrality < 7"; // centrality 10 - 80 %
TCut ptCut = "pt > 3";
TCut allCuts = centralityCut && ptCut;
TCut centralityWeight = "centralityCorrection";
// -- fill the histograms
secondary->Project("sig", "m", (allCuts && LcMinusCut)*centralityWeight );
secondary->Project("bkg", "m", (allCuts && LcMinusCut && "m <= 2.25 || m >= 2.32")*centralityWeight );
// bkg->Scale(1./3.);
TF1 *line = new TF1("line", "[0] + [1]*x");
TF1 *gaussPlusLine = new TF1("gaussPlusLine", "[0] + [1]*x + [2]*TMath::Gaus(x,[3],[4],1)");
bkg->Fit(line, "", "", 2.1, 2.5);
double offset = line->GetParameter(0);
double slope = line->GetParameter(1);
// const double LcMass = 2.28646;
const double LcMass = 2.28295;
gaussPlusLine->FixParameter(0,offset);
gaussPlusLine->FixParameter(1,slope);
gaussPlusLine->FixParameter(3,LcMass);
gaussPlusLine->SetParameter(2,1);
gaussPlusLine->FixParameter(4,1.10012e-02);
sig->Fit(gaussPlusLine, "", "", 2.1, 2.5);
// -- Drawing
sig->GetXaxis()->SetTitle("#font[12]{m}_{p^{-}K^{+}#pi^{-}} (GeV/#font[12]{c}^{2})");
sig->GetXaxis()->CenterTitle();
sig->GetXaxis()->SetLabelSize(0.04);
sig->GetXaxis()->SetTitleSize(0.055);
sig->GetXaxis()->SetTitleOffset(0.8);
// sig->GetXaxis()->SetTickLength(0.001);
sig->GetYaxis()->SetTitle("#font[12]{N}/(10 MeV/#font[12]{c}^{2})");
sig->GetYaxis()->CenterTitle();
sig->GetYaxis()->SetLabelSize(0.04);
sig->GetYaxis()->SetTitleSize(0.055);
sig->GetYaxis()->SetTitleOffset(0.8);
// sig->GetYaxis()->SetRangeUser(17, 95);
sig->SetMarkerStyle(20);
sig->SetLineColor(kBlack);
bkg->SetMarkerStyle(20);
bkg->SetMarkerColor(kBlue-7);
bkg->SetLineColor(kBlue-7);
bkg->GetFunction("line")->SetLineColor(kRed);
bkg->GetFunction("line")->SetLineStyle(2);
bkg->GetFunction("line")->SetNpx(10000);
sig->GetFunction("gaussPlusLine")->SetLineColor(kRed);
sig->GetFunction("gaussPlusLine")->SetNpx(10000);
sig->Draw("E");
bkg->Draw("Esame");
TLegend *leg = new TLegend(0.6,0.7,0.89,0.89);
leg->SetFillStyle(0);
leg->SetBorderSize(0);
leg->SetHeader("#bar{#Lambda_{c}}");
leg->AddEntry(sig, "Signal", "pl");
leg->AddEntry(bkg, "Side band", "pl");
leg->Draw();
TLegend *dataSet = new TLegend(0., 0.8, 0.6, 0.89);
dataSet->SetFillStyle(0);
dataSet->SetBorderSize(0);
dataSet->AddEntry("", "#font[22]{Au+Au 200 GeV, 10-80%}","");
dataSet->AddEntry("","#font[12]{p}_{T} > 3 GeV/#font[12]{c}","");
dataSet->Draw();
// -- yield calculation
const float min = 2.27;
const float max = 2.30;
// -- get part of the Gauss curve
TF1 *normGaus = new TF1("normGaus", "TMath::Gaus(x,[0],[1],1)");
double mean = gaussPlusLine->GetParameter(3);
double width= gaussPlusLine->GetParameter(4);
normGaus->SetParameter(0,mean);
normGaus->SetParameter(1,width);
double norm = normGaus->Integral(min, max);
int minBin = sig->FindBin(min) + 1;
int maxBin = sig->FindBin(max);
cout << "integral from " << sig->GetBinCenter(minBin) - 0.005 << " to " << sig->GetBinCenter(maxBin) + 0.005 << endl;
float NSig = sig->Integral(minBin,maxBin);
float NBkg = 100.*line->Integral(min, max);
float offsetError = line->GetParError(0)/offset;
float slopeError = line->GetParError(0)/slope;
float Nlc = (NSig - NBkg)/norm;
float error = std::sqrt(NSig + NBkg*NBkg*offsetError*offsetError)/norm;
cout << "N Sig = " << NSig << endl;
cout << "N Bkg = " << NBkg << endl;
cout << "norm = " << norm << endl;
cout << "N Lambda_c = " << round(Nlc) << endl;
cout << "sigma = " << round(error) << endl;
}