walk_corr.C

#include "TH2F.h"
#include "TH3F.h"
#include "TStyle.h"

void walk_corr(
//01 means it is used for channels 0 and 1

	const char *filename = "analysis_07_8.root",	//considered non-collimated
//	const char *filename = "analysis_08_2.root",
	const Bool_t can1 = 1)

{
	using std::cout;
	using std::endl;
	gSystem->Load("../libData.so");
	TFile *f = new TFile(Form("../data/dataDSR4/%s", filename));
	TTree *t = (TTree*)f->Get("atree");

	if(can1){
		
		TCanvas *c1 = new TCanvas("c1", "Trying to correct the walk effect");

//pictures for latex report, LED
/*		c1->Divide(2,1);
		c1->cd(1);
		TH2F *h2 = new TH2F("h2", "time difference (LED method) vs charge of non-trigger channel ", 100, -12 ,5, 100, 0, 0.14e-9);
		t->Draw(" Ach1.fChargeLED : Ach0.fTimeLED - Ach1.fTimeLED >> h2","","col");
		//x
		h2->GetXaxis()->SetTitle("time  [ns]");
		h2->GetXaxis()->CenterTitle();
		//y
		h2->GetYaxis()->SetTitle("Q [C]");
		h2->GetYaxis()->CenterTitle();

//		c1->cd(2);
		TProfile *prof1 = new TProfile("prof1","Profile of y vs x",100, -12, 5, 0, 0.17e-9);
		prof1 = h2->ProfileX();
//		prof1->Fit("pol2","","",-6,0);
		prof1->Draw("same");
*/

//pictures for latex report, CFD
		c1->Divide(2,2);
		c1->cd(1);
		TH2F *h2 = new TH2F("h2", "time difference (CFD method) vs charge of non-trigger channel ", 100, -12 ,5, 100, 0, 0.17e-9);
		t->Draw(" Ach1.fChargeCFD : Ach0.fTimeCFD - Ach1.fTimeCFD  >> h2","","col");
		//x
		h2->GetXaxis()->SetTitle("time [ns]");
		h2->GetXaxis()->CenterTitle();
		//y
		h2->GetYaxis()->SetTitle("Q [C]");
		h2->GetYaxis()->CenterTitle();
		h2->SetMaximum(10);
		c1->Update();

		c1->cd(2);
		//TProfile *prof1 = new TProfile("prof1","Profile of y vs x"/*,100, -12, 5, 0, 0.17e-9, "o"*/);
		TProfile *prof1 = h2->ProfileX();
		//prof1 = h2->ProfileY();
		TF1 *myfit = new TF1("myfit","[0] - [1]*exp([2]/sqrt(x))");
		myfit->SetRange(0.0, 0.08);
		prof1->Fit("pol1","","",-4,0);
		//prof1->Fit("myfit","R");//,0,0.06);
		prof1->Draw();

		c1->cd(3);
		TH2F *h3 = new TH2F("h3", "time difference (CFD method) vs charge of non-trigger channel AFTER CORRECTION", 100, -12 ,5, 100, 0, 0.17e-9);
		h3->SetMaximum(10);
		t->Draw("Ach1.fChargeCFD : (Ach0.fTimeCFD - Ach1.fTimeCFD) + 0.550*1.58e-11/Ach1.fChargeCFD >> h3","","col");

		c1->cd(4);
		TH1F *h4 = new TH1F("h4", "time difference AFTER CORRECTION", 50, -8, 8);
		t->Draw(" (Ach0.fTimeCFD - Ach1.fTimeCFD) + 0.550*1.58e-11/Ach1.fChargeCFD >> h4","Ach0.fTimeCFD>100. && Ach0.fTimeCFD<160 && Ach1.fTimeCFD>100. && Ach1.fTimeCFD<160","");
		h4->GetXaxis()->SetTitle("Time difference [ns]");
		h4->GetXaxis()->CenterTitle();
		//h4->Fit("gaus","","",-3,1);
		h4->Fit("gaus","","",-2,1.5);
		gStyle->SetOptFit();

	}

}