plot_map.C

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//#include "../prttools/prttools.C"
#include "prttools.C"
#include "DrcPidFast.h"

void plot_map(int pdg = 211) {

  prt_setRootPalette(1);
  TH2F *hsep = new TH2F("hsep", "#pi/K separation power [s.d.] ;polar angle [deg];momentum [GeV/c]",
                        141, 19.5, 160.5, 50, 0.1, 10.1);
  TH1F *hPi = new TH1F("hPi", "hPi", 500, -100, 100);
  TH1F *hK = new TH1F("hK", "hK", 500, -100, 100);
  double m1 = 0, m2 = 0, s1 = 0, s2 = 0, sep = 0;
  DrcPidFast pid;
  DrcPidInfo info;
  TF1 *ff;
  // TCanvas *cc = new TCanvas("cc","cc",800,500);
  for (double m = 0.6; m <= 10; m = m + 0.2) {
    if (m > 3) {
      delete hK;
      delete hPi;
      hK = new TH1F("hK", "hK", 200, -20, 20);
      hPi = new TH1F("hPi", "hPi", 200, -20, 20);
    }
    if (m < 1) {
      delete hK;
      delete hPi;
      hK = new TH1F("hK", "hK", 1000, -500, 500);
      hPi = new TH1F("hPi", "hPi", 1000, -500, 500);
    }

    for (int t = 20; t <= 160; t++) {
      TVector3 mom(0, 0, m);
      mom.RotateX(t / 180. * TMath::Pi());
      for (int i = 0; i < 2000; i++) {
        info = pid.GetInfo(pdg, mom, 0.5);
        hPi->Fill(info.sigma[2]);
        hK->Fill(info.sigma[3]);
      }

      {
        hK->Fit("gaus", "Q0");
        ff = hK->GetFunction("gaus");
        if (ff) m1 = ff->GetParameter(1);
        if (ff) s1 = ff->GetParameter(2);
        hPi->Fit("gaus", "Q0");
        ff = hPi->GetFunction("gaus");
        if (ff) m2 = ff->GetParameter(1);
        if (ff) s2 = ff->GetParameter(2);

        if (s1 + s2 > 0) sep = (fabs(m2 - m1)) / (0.5 * (s1 + s2));
      }

      // hPi->Draw();
      // hPi->SetLineColor(kBlue);
      // hK->SetLineColor(kRed);
      // hK->Draw("same");
      // cc->Update();
      // cc->WaitPrimitive();

      hsep->Fill(t, m, sep);

      hPi->Reset();
      hK->Reset();
    }
  }

  // prt_canvasAdd("diff",800,500);
  // hPi->Draw();
  // hPi->SetLineColor(kBlue);
  // hK->SetLineColor(kRed);
  // hK->Draw("same");

  gStyle->SetOptStat(0);
  prt_canvasAdd("map_sep", 800, 500);
  gPad->SetLogz();
  hsep->Draw("colz");
  hsep->GetYaxis()->SetRangeUser(0.6, 10);
  hsep->SetMaximum(10);
   hsep->SetMinimum(1);

  // draw ctr map
  prt_canvasAdd("map_ctr", 800, 500);
  pid.GetTrrMap()->SetTitle("Cherenkov track resolution [mrad]");
  pid.GetTrrMap()->Draw("colz");

  prt_savepath = "data/plot_map";
  prt_canvasSave(2);
}