SelectorCut Class Reference

Simple cut based selector for curl tracks taken from Belle note 1079. More...

#include <SelectorCut.h>

Inheritance diagram for SelectorCut:

Collaboration diagram for SelectorCut:

Public Member Functions
	SelectorCut (bool belleFlag)
	Constructor.
	~SelectorCut ()
	Destructor.
virtual float	getResponse (Particle *iPart, Particle *jPart) override
	Selector response that this pair of particles come from the same mc/actual particle.
virtual std::vector< float >	getVariables (Particle *iPart, Particle *jPart) override
	returns vector of variables used by this selector.
virtual float	getOptimalResponseCut ()
	returns optimal cut to use with selector
virtual void	initialize ()
	initialise selector if needed
virtual void	finalize ()
	finalise selector if needed
virtual void	collectTrainingInfo (Particle *, Particle *)
	collect information for training for mva or other selectors

Private Attributes
double	m_magDiffPCut
	cut for momentum magnitude difference
double	m_sameChargePhiCut
	cut for angle between momenta of the two particles when they have the same charge
double	m_oppositeChargePhiCut
	cut for angle between momenta of the two particles when they have the opposite charge

Detailed Description

Simple cut based selector for curl tracks taken from Belle note 1079.

Definition at line 24 of file SelectorCut.h.

Constructor & Destructor Documentation

SelectorCut()

SelectorCut ( bool  belleFlag )

explicit

Constructor.

Definition at line 17 of file SelectorCut.cc.

{
  if (belleFlag) {
    //BN1079 cuts
    m_magDiffPCut = 0.1;
    m_sameChargePhiCut = 15;
    m_oppositeChargePhiCut = 165;
  } else {
    // TODO - update these with actual values. Is this even worth if switching to MVA anyway?
    m_magDiffPCut = 0.1;
    m_sameChargePhiCut = 15;
    m_oppositeChargePhiCut = 165;
  }
 
}

Member Function Documentation

collectTrainingInfo()

virtual void collectTrainingInfo ( Particle *  , Particle *    )

inlinevirtualinherited

collect information for training for mva or other selectors

Reimplemented in SelectorMVA.

Definition at line 49 of file Selector.h.

{};

finalize()

virtual void finalize ( )

inlinevirtualinherited

finalise selector if needed

Reimplemented in SelectorMVA.

Definition at line 46 of file Selector.h.

{};

getOptimalResponseCut()

virtual float getOptimalResponseCut ( )

inlinevirtualinherited

returns optimal cut to use with selector

Reimplemented in SelectorMVA.

Definition at line 40 of file Selector.h.

{return 0.5;};

getResponse()

float getResponse ( Particle *  iPart, Particle *  jPart  )

overridevirtual

Selector response that this pair of particles come from the same mc/actual particle.

Implements Selector.

Definition at line 43 of file SelectorCut.cc.

{
  //Selection from BN1079
  std::vector<float> variables = getVariables(iPart, jPart);
  float chargeProduct = variables[0];
  float magDiffP = variables[1];
  float phi = variables[2];
 
  if (magDiffP > m_magDiffPCut) {return 0.;}
  if (chargeProduct > 0) {
    if (phi < m_sameChargePhiCut * TMath::Pi() / 180) {return 1.;}
  }
  if (chargeProduct < 0) {
    if (phi > m_oppositeChargePhiCut * TMath::Pi() / 180) {return 1.;}
  }
 
  return 0.;
}

getVariables()

std::vector< float > getVariables ( Particle *  iPart, Particle *  jPart  )

overridevirtual

returns vector of variables used by this selector.

Not really useful here but included to be consistent with eventual MVA method.

Implements Selector.

Definition at line 35 of file SelectorCut.cc.

{
  float chargeProduct = iPart -> getCharge() * jPart -> getCharge();
  float magDiffP = (iPart->getMomentum() - jPart->getMomentum()).R();
  float phi = acos(iPart->getMomentum().Unit().Dot(jPart->getMomentum().Unit()));
  return {chargeProduct, magDiffP, phi};
}

initialize()

virtual void initialize ( )

inlinevirtualinherited

initialise selector if needed

Reimplemented in SelectorMVA.

Definition at line 43 of file Selector.h.

{};

Member Data Documentation

m_magDiffPCut

double m_magDiffPCut

private

cut for momentum magnitude difference

Definition at line 41 of file SelectorCut.h.

m_oppositeChargePhiCut

double m_oppositeChargePhiCut

private

cut for angle between momenta of the two particles when they have the opposite charge

Definition at line 47 of file SelectorCut.h.

m_sameChargePhiCut

double m_sameChargePhiCut

private

cut for angle between momenta of the two particles when they have the same charge

Definition at line 44 of file SelectorCut.h.

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

• analysis/modules/CurlTagger/include/SelectorCut.h
• analysis/modules/CurlTagger/src/SelectorCut.cc