CMSSW Reference Manual

Helper class to get actual values from acceptance tables stored as TH3F. The class can provide acceptance values for a near-beam detector or a combination (e.g. 420+220).

A class instance is initialized from a root file with TH3F-type histograms of acceptance: for low t: acceptance as function of log10(-t), log10(xi) and phi; for high t: acceptance as function of -t, log10(xi) and phi.

The acceptance can be extracted from tables for given t,xi,phi with a dedicated method.

Constructor & Destructor Documentation

AcceptanceTableHelper::AcceptanceTableHelper ( ) [inline]

Default constructor.

Definition at line 32 of file AcceptanceTableHelper.h.

00032 : h_log10t_log10Xi_Phi(NULL),h_t_log10Xi_Phi(NULL) {;}

AcceptanceTableHelper::~AcceptanceTableHelper ( ) [inline]

Delete acceptance histograms.

Definition at line 35 of file AcceptanceTableHelper.h.

References h_log10t_log10Xi_Phi, and h_t_log10Xi_Phi.

00035                            { 
00036     if (h_log10t_log10Xi_Phi) delete h_log10t_log10Xi_Phi;
00037     if (h_t_log10Xi_Phi) delete h_t_log10Xi_Phi;
00038   }

Member Function Documentation

float AcceptanceTableHelper::GetAcceptance	(	float	t,
		float	xi,
		float	phi
	)

Acceptance as a function of t, xi and phi.

Return acceptance for given t, xi, phi.

Definition at line 50 of file AcceptanceTableHelper.cc.

References h_log10t_log10Xi_Phi, h_t_log10Xi_Phi, and NULL.

Referenced by ProtonTaggerFilter::filter().

00050                                                                        {
00051 
00052   float log10t  = log10(-t);
00053   float log10Xi = log10(xi);
00054 
00055   float acc = 0;
00056 
00057   if ((h_log10t_log10Xi_Phi != NULL)                              // if table exists
00058        && (log10t < h_log10t_log10Xi_Phi->GetXaxis()->GetXmax())) // and t within table range
00059   {
00060   
00061     float log10tMin = h_log10t_log10Xi_Phi->GetXaxis()->GetXmin();
00062     if (log10t < log10tMin) log10t = log10tMin; // very small t should go to the lowest t bin
00063     
00064     acc = h_log10t_log10Xi_Phi->GetBinContent(h_log10t_log10Xi_Phi->FindBin(log10t, log10Xi, phi));
00065 
00066   } else if (h_t_log10Xi_Phi != NULL) { // if table exists for high t
00067 
00068      acc = h_t_log10Xi_Phi->GetBinContent(h_t_log10Xi_Phi->FindBin(-t, log10Xi, phi));
00069   }
00070   
00071   return acc;
00072 }

void AcceptanceTableHelper::Init	(	TFile &	f,
		const std::string	basename
	)

Get acceptance tables from root file.

Read from root file <f> acceptance tables named <basename> and <basename>_hight.

Definition at line 18 of file AcceptanceTableHelper.cc.

References GenMuonPlsPt100GeV_cfg::cout, lat::endl(), h, h_log10t_log10Xi_Phi, h_t_log10Xi_Phi, and NULL.

Referenced by ProtonTaggerFilter::beginJob().

00019 {
00020   // ... read table for low t
00021   TH3F *h = (TH3F*)f.Get(basename.c_str());
00022 
00023   if (h != NULL)
00024   {
00025     h_log10t_log10Xi_Phi = (TH3F*)h->Clone();
00026     std::cout << "Read ";
00027     h_log10t_log10Xi_Phi->SetDirectory(0); // secure it from deleting if the file is eventually closed
00028     h_log10t_log10Xi_Phi->Print();
00029   } else {
00030     std::cout << "Warning: could not get acceptance table " << basename << std::endl;
00031   }
00032   
00033   // ... read table for high t
00034   std::string name2 = basename+"_hight";
00035   h = (TH3F*)f.Get(name2.c_str());
00036 
00037   if (h != NULL)
00038   {
00039     h_t_log10Xi_Phi = (TH3F*)h->Clone();
00040     h_t_log10Xi_Phi->SetDirectory(0); // secure it from deleting if the file is eventually closed
00041     std::cout << "Read ";
00042     h_t_log10Xi_Phi->Print();
00043   } else {
00044     std::cout << "Warning: could not get acceptance table " << name2 << std::endl;
00045   }
00046 }

Member Data Documentation

TH3F* AcceptanceTableHelper::h_log10t_log10Xi_Phi [private]

Table for low t: acceptance as a function of log10(t), log10(Xi) and Phi.

Definition at line 49 of file AcceptanceTableHelper.h.

Referenced by GetAcceptance(), Init(), and ~AcceptanceTableHelper().

TH3F* AcceptanceTableHelper::h_t_log10Xi_Phi [private]

Table for high t: acceptance as a function of -t, log10(Xi) and Phi.

Definition at line 52 of file AcceptanceTableHelper.h.

Referenced by GetAcceptance(), Init(), and ~AcceptanceTableHelper().

AcceptanceTableHelper Class Reference

Public Member Functions

Private Attributes

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation


Public Member Functions
	AcceptanceTableHelper ()
	Default constructor.
float	GetAcceptance (float, float, float)
	Acceptance as a function of t, xi and phi.
void	Init (TFile &, const std::string)
	Get acceptance tables from root file.
	~AcceptanceTableHelper ()
	Delete acceptance histograms.
Private Attributes
TH3F *	h_log10t_log10Xi_Phi
	Table for low t: acceptance as a function of log10(t), log10(Xi) and Phi.
TH3F *	h_t_log10Xi_Phi
	Table for high t: acceptance as a function of -t, log10(Xi) and Phi.