Atlfast::CellSmearer Class Reference

Provides parameterised cell smearing. Based on the low luminosity JetSmearer with size 0.1*0.1. Cell Smearer honours the ISmearer interface and uses implementation of the DefaultSmearer class. More...

#include <CellSmearer.h>

Inheritance diagram for Atlfast::CellSmearer:

[legend]Collaboration diagram for Atlfast::CellSmearer:

[legend]List of all members.

Public Member Functions
	CellSmearer (const int aseed, const double barrelForwardEta)
virtual	~CellSmearer ()
virtual HepLorentzVector	smear (const HepMC::GenParticle &)
virtual HepLorentzVector	smear (const HepLorentzVector &avec)
virtual int	setSmearParameters (const std::vector< double > &smearValues)
virtual int	setSmearParamSchema (const int smearSchema)
Private Member Functions
RandGauss *	randGauss ()
RandFlat *	randFlat ()
Private Attributes
double	m_BarrelForwardEta

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Detailed Description

Provides parameterised cell smearing. Based on the low luminosity JetSmearer with size 0.1*0.1. Cell Smearer honours the ISmearer interface and uses implementation of the DefaultSmearer class.

Author:

J.Couchman

Definition at line 40 of file CellSmearer.h.

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Constructor & Destructor Documentation

Atlfast::CellSmearer::CellSmearer	(	const int	aseed,
		const double	barrelForwardEta
	)			[inline]

Constructor as in DefaultSmearer

Definition at line 48 of file CellSmearer.h.

                                                 : 
        ISmearer(), 
        DefaultSmearer(aseed), 
        m_BarrelForwardEta(barrelForwardEta) 
        { }

virtual Atlfast::CellSmearer::~CellSmearer

(

)

[inline, virtual]

Destructor as in DefaultSmearer

Definition at line 55 of file CellSmearer.h.

{ }

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Member Function Documentation

HepLorentzVector Atlfast::CellSmearer::smear

(

const HepMC::GenParticle &

)

[virtual]

Smear method for HepMC::GenParticle

Reimplemented from Atlfast::DefaultSmearer.

Definition at line 23 of file CellSmearer.cxx.

                                                                     {
    return smear(particle.momentum());
  }

HepLorentzVector Atlfast::CellSmearer::smear

(

const HepLorentzVector &

avec

)

[virtual]

Smear method for HepLorentzVector

Reimplemented from Atlfast::DefaultSmearer.

Definition at line 27 of file CellSmearer.cxx.

                                                                  {
//........................................................
//.....smear Cells energy
//........................................................
//     parametrizes smearing for hadronic energy deposition
//     parametrization from L. Poggioli
//     no pileup added

    float sigma=0.;
    HepLorentzVector smearedVec(vec);
    float aa, bb;
    float sqrtene = sqrt(vec.e()/GeV);
    float abseta  = fabs(vec.pseudoRapidity());
    while(1) {
      aa=randGauss()->fire();
      bb=randGauss()->fire();
      if(abseta < m_BarrelForwardEta) sigma = aa*0.5/sqrtene + bb*0.03;
      else            sigma = aa*1.0/sqrtene + bb*0.07;
      if(1.+sigma > .0) break;
    }
    smearedVec.setPx(vec.px()*(1.0+sigma));
    smearedVec.setPy(vec.py()*(1.0+sigma));
    smearedVec.setPz(vec.pz()*(1.0+sigma));
    smearedVec.setE(vec.e()*(1.0+sigma));
    return smearedVec;
    
  }

int Atlfast::CellSmearer::setSmearParameters

(

const std::vector< double > &

smearValues

)

[virtual]

Sets the smearing parameters

Reimplemented from Atlfast::DefaultSmearer.

Definition at line 56 of file CellSmearer.cxx.

                                                                              {
    return 0;
  }

int Atlfast::CellSmearer::setSmearParamSchema

(

const int

smearSchema

)

[virtual]

Sets the smearing schema

Reimplemented from Atlfast::DefaultSmearer.

Definition at line 60 of file CellSmearer.cxx.

                                                                 {
    return 0;
  }

RandGauss* Atlfast::DefaultSmearer::randGauss

(

)

[inline, inherited]

Hook for subclasses etc. to get their hands on a randGauss object

Definition at line 65 of file DefaultSmearer.h.

{ return m_randGauss;}

RandFlat* Atlfast::DefaultSmearer::randFlat

(

)

[inline, inherited]

Hook for subclasses etc. to get their hands on a randFlat object

Definition at line 71 of file DefaultSmearer.h.

{ return m_randFlat;}

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Member Data Documentation

double Atlfast::CellSmearer::m_BarrelForwardEta [private]

Transition between Barrel and forward Calo

Definition at line 69 of file CellSmearer.h.

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The documentation for this class was generated from the following files:

• /afs/cern.ch/user/s/sdean/project_builds/AtlasOffline-rel_1/Simulation/Atlfast/AtlfastAlgs/AtlfastAlgs/CellSmearer.h
• /afs/cern.ch/user/s/sdean/project_builds/AtlasOffline-rel_1/Simulation/Atlfast/AtlfastAlgs/src/CellSmearer.cxx

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