Gabriele Cosmo
94 lines
3.9 KiB
C++
94 lines
3.9 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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/// \file Par02Smearer.hh
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/// \brief Definition of the Par02Smearer class
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#ifndef PAR02_SMEARER_H
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#define PAR02_SMEARER_H
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#include "CLHEP/Random/JamesRandom.h"
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#include "CLHEP/Random/RandGauss.h"
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#include "Par02Output.hh"
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#include "G4Track.hh"
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#include "globals.hh"
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/// Smearing of the particle momentum or energy.
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///
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/// A singleton class used to smear (alter) the particle momentum (for tracking
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/// detectors) and energy (for calorimeters). In case the resolution is given,
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/// the momentum (energy) is smeared with Gaussian distribution.
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/// @author Anna Zaborowska
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class Par02Smearer
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{
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public:
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/// Allows the access to the unique Par02Smearer class object.
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/// @return A pointer to the Par02Smearer class.
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static Par02Smearer* Instance();
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/// Smears the momentum with a given resolution.
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/// @param aTrack A track to smear.
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/// @param aResolution A resolution. Gaussian smearing is done with a
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/// given resolution as a standard deviation.
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G4ThreeVector SmearMomentum(const G4Track* aTrack, G4double aResolution = -1);
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/// Smears the energy deposit with a given resolution.
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/// @param aTrack A track to smear.
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/// @param aResolution A resolution. Gaussian smearing is done with a
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/// given resolution as a standard deviation.
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G4double SmearEnergy(const G4Track* aTrack, G4double aResolution = -1);
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/// First possible type of smearing. Smears the momentum with a given resolution.
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/// @param aTrackOriginal A track to smear.
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/// @param aResolution A resolution taken as a standard deviation of a
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/// Gaussian distribution.
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G4ThreeVector SmearGaussian(const G4Track* aTrackOriginal, G4double aResolution);
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/// Returns a random number from a Gaussian distribution.
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/// @param aMean The mean of the Gaussian distribution.
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/// @param aStandardDeviation The standard deviation of a Gaussian distribution.
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G4double Gauss(G4double aMean, G4double aStandardDeviation);
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protected:
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/// A default constructor.
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Par02Smearer();
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~Par02Smearer();
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private:
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/// A pointer to Par02Smearer object.
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static Par02Smearer* fPar02Smearer;
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/// CLHEP random engine.
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CLHEP::HepRandomEngine* fRandomEngine;
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/// CLHEP random engine used in gaussian smearing.
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CLHEP::RandGauss* fRandomGauss;
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};
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#endif
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