hcal_calib.cpp

#include "TCanvas.h"
#include "THcShowerCalib.h"

//
// A steering Root script for the HMS calorimeter calibration.
//

void hcal_calib(Int_t RunNumber) {
 
 cout << "Calibrating run " << RunNumber << endl;

 THcShowerCalib theShowerCalib(RunNumber);

 theShowerCalib.ExtractData();      // Extract data from the Root file
 theShowerCalib.Init();             // Initialize constants adn variables
 theShowerCalib.CalcThresholds();   // Thresholds on the uncalibrated Edep/P
 theShowerCalib.ComposeVMs();       // Compute vectors amd matrices for calib.
 theShowerCalib.SolveAlphas();      // Solve for the calibration constants
 theShowerCalib.FillHEcal();        // Fill histograms
 theShowerCalib.SaveAlphas();       // Save the constants

 // Plot histograms
 
 TCanvas* Canvas =
   new TCanvas("Canvas", "HMS Shower Counter calibration", 1000, 667);
 Canvas->Divide(2,2);

 Canvas->cd(1);

 // Normalized uncalibrated energy deposition.

 theShowerCalib.hEunc->DrawCopy();
  
 theShowerCalib.hEuncSel->SetFillColor(kGreen);
 theShowerCalib.hEuncSel->DrawCopy("same");

 // Normalized energy deposition after calibration.

 Canvas->cd(3);
 // theShowerCalib.hEcal->Draw();
 theShowerCalib.hEcal->Fit("gaus");

 // Momentum versus the calibrated energy deposition.

 Canvas->cd(4);
 theShowerCalib.hPvsEcal->Draw();

}