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void pi0_mfitpeak(TH1F *mh1, Int_t etapi0flag, float xmin, float xmax, int npol, double res[], string dirName,string histName)
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{
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gROOT->Reset();
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// gStyle->SetOptFit();
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// gStyle->SetOptFit(0);
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// gStyle->SetOptStat(0);
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// gStyle->SetOptTitle(0);
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Bool_t NOTE=1;
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if(NOTE) gStyle->SetCanvasBorderMode(0);
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gStyle->SetPadTopMargin(0.08);
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gStyle->SetPadBottomMargin(0.12);
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gStyle->SetPadLeftMargin(0.15);
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gStyle->SetPadRightMargin(0.08);
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mh1->GetXaxis()->SetRangeUser(xmin,xmax);
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// cout<<FileName<<" "<<HistName<<endl;
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// TFile f(FileName);
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// TH1F *mh1 = (TH1F*) f.Get(HistName);
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mh1->SetMarkerStyle(20);
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mh1->SetMarkerSize(1.);
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mh1->SetStats(0); // 1/0 to set the stat box
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mh1->GetXaxis()->SetTitle("Invariant Mass of Photon Pairs [GeV]");
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float binwidth = mh1->GetBinWidth(1);
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char *ytitle = new char[100];
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sprintf(ytitle,"Photon Pairs / %4.3f GeV",binwidth);
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mh1->GetYaxis()->SetTitle(ytitle);
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mh1->GetXaxis()->SetTitleSize(0.055);
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mh1->GetYaxis()->SetTitleSize(0.055);
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mh1->GetXaxis()->SetLabelSize(0.045);
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mh1->GetYaxis()->SetLabelSize(0.045);
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mh1->GetXaxis()->SetTitleOffset(0.90);
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mh1->GetXaxis()->CenterTitle();
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mh1->GetYaxis()->SetTitleOffset(1.32);
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// First work with the histogram and find the peak and fit ranges
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TAxis *xaxis = mh1->GetXaxis();
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Float_t binsiz= xaxis->GetBinCenter(3) - xaxis->GetBinCenter(2);
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Int_t nbins = xaxis->GetNbins();
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Float_t nevtperbin0[10000];
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//Float_t errorbin0[10000];
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Float_t nevttot;
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Float_t maxbin=0; Int_t nmaxbin=0, nminbord=0, nmaxbord=nbins;
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double maxbin_val = 0;
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for (Int_t nn=1; nn <= nbins; nn++)
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{
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nevtperbin0[nn] = mh1->GetBinContent(nn);
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if(nevtperbin0[nn] > maxbin) {
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maxbin_val = mh1->GetBinCenter(nn);
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maxbin=nevtperbin0[nn]; nmaxbin=nn; }
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//errorbin0[nn] = mh1->GetBinError(nn);
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nevttot+=nevtperbin0[nn];
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if(nevtperbin0[nn] > 0 && nminbord == 0) nminbord=nn;
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if(nevtperbin0[nn] == 0 && (nn > nminbord +10) && nmaxbord==0 && nminbord > 0) nmaxbord=nn;
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}
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//cout<<"Minbordl "<<nminbord<<" with events: "<<nevtperbin0[nminbord]<<endl;
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//cout<<"Maxbordl "<<nmaxbord<<" with events: "<<nevtperbin0[nmaxbord]<<endl;
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nminbord+=0;
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nmaxbord-=0;
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// Int_t nmin0=nminbord;
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while(nevtperbin0[nminbord] < nevtperbin0[nmaxbin]*0.025) nminbord++;
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while(nevtperbin0[nmaxbord] < nevtperbin0[nmaxbin]*0.025) nmaxbord--;
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// the above was just to get the info and low/high bins
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// Set the fit range ! This is for total fit !
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Float_t fitl=xmin;
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float fith=xmax;
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// Float_t fitl=0.07, fith=0.2;// this works better for pileup
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// Float_t fitl=0.08, fith=0.18;// this works even better for pileup
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// if(etapi0flag == 1)
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// {
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// fitl=0.35; fith=0.75;
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//}
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// if(fitl < xaxis->GetBinCenter(nmin0)) fitl = xaxis->GetBinCenter(nmin0);
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//if(fith > xaxis->GetBinCenter(nmaxbord)) fith = xaxis->GetBinCenter(nmaxbord);
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//cout<<" fit range "<<fitl<<" -- "<<fith<<endl;
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//cout <<"Bin size "<<binsiz<<endl;
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///cout<<"Total events "<<nevttot<<endl;
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///cout<<"MaxBin "<<nmaxbin<<" with events: "<<nevtperbin0[nmaxbin]<<endl;
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//cout<<"Minbord "<<nminbord<<" with events: "<<nevtperbin0[nminbord]<<endl;
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//cout<<"Maxbord "<<nmaxbord<<" with events: "<<nevtperbin0[nmaxbord]<<endl;
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//mh1->DrawCopy("sep");
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if(etapi0flag ==0){
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if( maxbin_val < 0.09 || maxbin_val >0.18){
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maxbin_val = 0.13;
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}
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}else if(etapi0flag == 1){
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if( maxbin_val < 0.45 || maxbin_val >0.65){
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maxbin_val = 0.54;
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}
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}
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Double_t lowgauss= maxbin_val-4.*0.010;
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Double_t highgauss= maxbin_val+4.*0.010;
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if(etapi0flag == 1)
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{
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lowgauss=maxbin_val-5.*0.025;
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highgauss=maxbin_val+5.*0.025;
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}
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Int_t nlowgauss=Int_t((lowgauss-xaxis->GetBinCenter(1))/Float_t(binsiz)+0.5);
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Int_t nhighgauss=Int_t((highgauss-xaxis->GetBinCenter(1))/Float_t(binsiz)+0.5);
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//cout <<xaxis->GetBinCenter(nlowgauss)<<" "<<xaxis->GetBinCenter(nhighgauss)<<endl;
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// now make the "background" histogram and fit it with p4
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Float_t lowvalgauss=nevtperbin0[nlowgauss];
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Float_t increm=(nevtperbin0[nhighgauss]-nevtperbin0[nlowgauss])/Float_t(nhighgauss-nlowgauss);
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TH1F *hbkg = (TH1F*)mh1->Clone();
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// hbkg->SetName("bkg_clone");
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for (Int_t nn=nlowgauss; nn<=nhighgauss; nn++)
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{
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hbkg->SetBinContent(nn,Float_t(lowvalgauss+(nn-nlowgauss)*increm));
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hbkg->SetBinError(nn,sqrt(lowvalgauss+(nn-nlowgauss)*increm));
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}
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//hbkg->DrawCopy("samesep");
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// break;
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// Now define the "gaussian" histogram
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TH1F *hgauss = (TH1F*)mh1->Clone();
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hgauss->SetName("gauss_clone");
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hgauss->Sumw2();
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hgauss->Add(mh1,hbkg,1,-1); // if errors are independent Add needs to be used !
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for (Int_t nn=1; nn <= nbins; nn++)
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{
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if(hgauss->GetBinContent(nn) < 0.) hgauss->SetBinContent(nn,0.001*nevtperbin0[nmaxbin]);
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hgauss->SetBinError(nn,sqrt(hgauss->GetBinContent(nn)));
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}
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// Declare function with wich to fit
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TF1 *g1 = new TF1("g1","gaus",lowgauss,highgauss);
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hgauss->Fit(g1,"R0q");
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//hgauss->DrawCopy("sep");
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//g1->Draw("same");
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char *polff = new char[20];
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sprintf(polff,"pol%d",npol);
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TF1 *p4bkg;
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if(etapi0flag != 1)
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p4bkg = new TF1("pm2",polff, xaxis->GetBinCenter(nminbord),xaxis->GetBinCenter(nmaxbord));
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else
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p4bkg = new TF1("pm2",polff, 0.35,0.75);
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hbkg->Fit(p4bkg,"R0q");
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//hbkg->DrawCopy("sep");
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//p4bkg->Draw("same");
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Double_t par[20],parf[20],errparf[20];
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g1->GetParameters(&par[0]);
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p4bkg->GetParameters(&par[3]);
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char *totff = new char[20];
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sprintf(totff,"gaus(0)+pol%d(3)",npol);
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TF1 *total = new TF1("total",totff,fitl,fith);
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TF1 *p4bkgfin = new TF1("pm2",polff,fitl,fith);
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if(etapi0flag==0){
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double allintegral = mh1->Integral(int(0.08/binsiz),int(0.18/binsiz));
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total->SetParLimits(0,1,allintegral);
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total->SetParLimits(1,0.08,0.18);
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total->SetParLimits(2,0.135*0.03,0.135*0.3);
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if( par[0] >= allintegral) par[0] = allintegral-1;
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if( par[1] <0.08 || par[1] >0.18) par[1] = 0.135;
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if( par[2] < 0.135*0.03 || par[2] > 0.135*0.3) par[2] = 0.01;
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}else{
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double allintegral = mh1->Integral(int(0.4/binsiz),int(0.65/binsiz));
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total->SetParLimits(0,1,allintegral);
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total->SetParLimits(1,0.4,0.65);
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total->SetParLimits(2,0.55*0.02,0.55*0.3);
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if( par[0] >= allintegral) par[0] = allintegral-1;
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if( par[1] <0.4 || par[1] >0.65) par[1] = 0.55;
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if( par[2] < 0.55*0.02 || par[2] > 0.55*0.3) par[2] = 0.55*0.04;
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//total->SetParLimits(1,0.4,0.6);
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// total->SetParLimits(2,0.55*0.02,0.55*0.2);
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// total->SetParLimits(2,0.50*0.09,0.50*0.11);
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}
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// total->FixParameter(1,1.21340e-01);
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// total->FixParameter(2,2.69780e-02);
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total->SetParameters(par);
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mh1->Fit(total,"R0q");
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//cout<<" yield.. "<< total->GetParameter(0) <<"+/- " << total->GetParError(0)<<endl;
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total->GetParameters(parf);
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for( Int_t nn=0; nn < 3+npol+1; nn++) errparf[nn]=total->GetParError(nn);
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g1->SetParameters(&parf[0]);
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p4bkgfin->SetParameters(&parf[3]);
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Float_t int_min=parf[1]-2.*parf[2];
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Float_t int_max=parf[1]+2.*parf[2];
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Float_t sig_peak=g1->Integral(int_min,int_max)/binsiz;
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Float_t bkgd_peak=p4bkgfin->Integral(int_min,int_max)/binsiz;
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Float_t SB=sig_peak/bkgd_peak; Float_t SBerr=SB*(sqrt(1./sig_peak+1./bkgd_peak));
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int_min=parf[1]-5.*parf[2];
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int_max=parf[1]+5.*parf[2];
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float S_all = g1->Integral(int_min,int_max)/binsiz;
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float Serr_all = errparf[0]/ parf[0] * S_all;
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res[0] = parf[1];
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res[1] = errparf[1];
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res[2] = S_all;
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res[3] = Serr_all;
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res[4] = parf[2];
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res[5] = errparf[2];
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res[6] = SB;
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res[7] = SBerr;
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if( dirName != ""){
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TCanvas *c2 = new TCanvas("c2", "",448,184,625,583);
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total->SetLineWidth(3);
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total->SetLineColor(kBlue);
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p4bkgfin->SetLineWidth(3);
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p4bkgfin->SetLineColor(kRed);
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p4bkgfin->SetLineStyle(2);
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mh1->DrawCopy("sep");
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// total->SetRange(0.07,0.185);
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// p4bkgfin->SetRange(0.07,0.185);
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total->Draw("same");
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p4bkgfin->Draw("same");
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TLatex l;
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l.SetTextSize(0.05);
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l.SetTextColor(1);
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l.SetNDC();
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float sigma = parf[2]/ parf[1]*100;
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float sigmaerr = errparf[2]/ parf[1]*100;
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char *sigma_name = new char[50];
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sprintf(sigma_name,"#sigma = %3.2f #pm %3.2f %% ",sigma,sigmaerr);
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l.DrawLatex(0.43,0.67,sigma_name);
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// sprintf(sigma_name,"S/B = %3.2f #pm %3.2f ",SB,SBerr);
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//
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sprintf(sigma_name,"N_{sig} = %d #pm %d ",int(S_all),int(Serr_all));
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//
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l.DrawLatex(0.43,0.54,sigma_name);
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sprintf(sigma_name,"M = %3.2f #pm %3.2f MeV",parf[1]*1000.,errparf[1]*1000);
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l.DrawLatex(0.42,0.73,sigma_name);
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sprintf(sigma_name,"S/B_{#pm2#sigma} = %3.2f #pm %3.2f ",SB,SBerr);
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l.DrawLatex(0.383,0.47,sigma_name);
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//l.DrawLatex(0.169,470.,"d)");
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c2->Modified();
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c2->Update();
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char *filename = new char[1000];
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sprintf(filename,"%s/%s.gif",dirName.c_str(),histName.c_str());
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c2->SaveAs(filename);
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cout<<"res[0]: "<< res[0] <<" "<< res[2] <<" "<< res[6] <<" "<<res[1] <<endl;
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}
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p4bkg->Delete();
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g1->Delete();
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hbkg->Delete();
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hgauss->Delete();
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total->Delete();
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p4bkgfin->Delete();
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}
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