ForwardDetectors/plugins/AcceptanceTableHelper.h

0001 #ifndef FastSim_ProtonTaggerAcceptanceHelper_H
0002 #define FastSim_ProtonTaggerAcceptanceHelper_H
0003
0004 /// Access to acceptance tables stored in ROOT file
0005
0006 /**
0007  * Helper class to get actual values from acceptance tables stored as TH3F.
0008  * The class can provide acceptance values for a near-beam detector
0009  * or a combination (e.g. 420+220).
0010  *
0011  * A class instance is initialized from a root file with TH3F-type histograms of acceptance:
0012  * for  low t: acceptance as function of log10(-t), log10(xi) and phi;
0013  * for high t: acceptance as function of -t, log10(xi) and phi.
0014  *
0015  * The acceptance can be extracted from tables for given t,xi,phi with a dedicated method.
0016  *
0017  * Author: Dmitry Zaborov
0018  */
0019
0020 // Version: $Id: AcceptanceTableHelper.h,v 1.1 2007/09/28 08:39:53 dzaborov Exp $
0021
0022 #include "TFile.h"
0023 #include "TH3F.h"
0024
0025 #include <string>
0026
0027 class AcceptanceTableHelper {
0028 public:
0029   /// Default constructor
0030   AcceptanceTableHelper() : h_log10t_log10Xi_Phi(nullptr), h_t_log10Xi_Phi(nullptr) { ; }
0031
0032   /// Delete acceptance histograms
0033   ~AcceptanceTableHelper() {
0034     if (h_log10t_log10Xi_Phi)
0035       delete h_log10t_log10Xi_Phi;
0036     if (h_t_log10Xi_Phi)
0037       delete h_t_log10Xi_Phi;
0038   }
0039
0040   /// Get acceptance tables from root file
0041   void Init(TFile &, const std::string);
0042
0043   /// Acceptance as a function of t, xi and phi
0044   float GetAcceptance(float, float, float);
0045
0046 private:
0047   /// Table for  low t: acceptance as a function of log10(t), log10(Xi) and Phi
0048   TH3F *h_log10t_log10Xi_Phi;
0049
0050   /// Table for high t: acceptance as a function of -t, log10(Xi) and Phi
0051   TH3F *h_t_log10Xi_Phi;
0052 };
0053
0054 #endif