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class AliPID: public TObject


particle id probability densities

The AliPID class stores the probability densities for the different
particle type hypotheses electron, muon, pion, kaon, proton, photon,
pi0, neutron, K0 and electron conversion. These probability densities
are determined from the detector response functions.
The * and *= operators are overloaded for AliPID to combine the PIDs
from different detectors.

The Bayesian probability to be a particle of a given type can be
calculated from the probability densities, if the a priori probabilities
(or abundences, concentrations) of particle species are known. These
priors can be given as argument to the GetProbability or GetMostProbable
method or they can be set globally by calling the static method
SetPriors().

The implementation of this class is based on the note ...
by Iouri Belikov and Karel Safarik.

Function Members (Methods)

public:

	AliPID()
	AliPID(const AliPID& pid)
	AliPID(const Double_t* probDensity, Bool_t charged = kTRUE)
	AliPID(const Float_t* probDensity, Bool_t charged = kTRUE)
	~AliPID()
void	TObject::AbstractMethod(const char* method) const
virtual void	TObject::AppendPad(Option_t* option = "")
virtual void	TObject::Browse(TBrowser* b)
static TClass*	Class()
virtual const char*	TObject::ClassName() const
virtual void	TObject::Clear(Option_t* = "")
virtual TObject*	TObject::Clone(const char* newname = "") const
virtual Int_t	TObject::Compare(const TObject* obj) const
virtual void	TObject::Copy(TObject& object) const
virtual void	TObject::Delete(Option_t* option = "")MENU
virtual Int_t	TObject::DistancetoPrimitive(Int_t px, Int_t py)
virtual void	TObject::Draw(Option_t* option = "")
virtual void	TObject::DrawClass() constMENU
virtual TObject*	TObject::DrawClone(Option_t* option = "") constMENU
virtual void	TObject::Dump() constMENU
virtual void	TObject::Error(const char* method, const char* msgfmt) const
virtual void	TObject::Execute(const char* method, const char* params, Int_t* error = 0)
virtual void	TObject::Execute(TMethod* method, TObjArray* params, Int_t* error = 0)
virtual void	TObject::ExecuteEvent(Int_t event, Int_t px, Int_t py)
virtual void	TObject::Fatal(const char* method, const char* msgfmt) const
virtual TObject*	TObject::FindObject(const char* name) const
virtual TObject*	TObject::FindObject(const TObject* obj) const
virtual Option_t*	TObject::GetDrawOption() const
static Long_t	TObject::GetDtorOnly()
virtual const char*	TObject::GetIconName() const
AliPID::EParticleType	GetMostProbable() const
AliPID::EParticleType	GetMostProbable(const Double_t* prior) const
virtual const char*	TObject::GetName() const
virtual char*	TObject::GetObjectInfo(Int_t px, Int_t py) const
static Bool_t	TObject::GetObjectStat()
virtual Option_t*	TObject::GetOption() const
void	GetProbabilities(Double_t* probabilities) const
void	GetProbabilities(Double_t* probabilities, const Double_t* prior) const
Double_t	GetProbability(AliPID::EParticleType iType) const
Double_t	GetProbability(AliPID::EParticleType iType, const Double_t* prior) const
virtual const char*	TObject::GetTitle() const
virtual UInt_t	TObject::GetUniqueID() const
virtual Bool_t	TObject::HandleTimer(TTimer* timer)
virtual ULong_t	TObject::Hash() const
virtual void	TObject::Info(const char* method, const char* msgfmt) const
virtual Bool_t	TObject::InheritsFrom(const char* classname) const
virtual Bool_t	TObject::InheritsFrom(const TClass* cl) const
virtual void	TObject::Inspect() constMENU
void	TObject::InvertBit(UInt_t f)
virtual TClass*	IsA() const
virtual Bool_t	TObject::IsEqual(const TObject* obj) const
virtual Bool_t	TObject::IsFolder() const
Bool_t	TObject::IsOnHeap() const
virtual Bool_t	TObject::IsSortable() const
Bool_t	TObject::IsZombie() const
virtual void	TObject::ls(Option_t* option = "") const
void	TObject::MayNotUse(const char* method) const
virtual Bool_t	TObject::Notify()
void	TObject::Obsolete(const char* method, const char* asOfVers, const char* removedFromVers) const
static void	TObject::operator delete(void* ptr)
static void	TObject::operator delete(void* ptr, void* vp)
static void	TObject::operator delete[](void* ptr)
static void	TObject::operator delete[](void* ptr, void* vp)
void*	TObject::operator new(size_t sz)
void*	TObject::operator new(size_t sz, void* vp)
void*	TObject::operator new[](size_t sz)
void*	TObject::operator new[](size_t sz, void* vp)
AliPID&	operator*=(const AliPID& pid)
AliPID&	operator=(const AliPID& pid)
virtual void	TObject::Paint(Option_t* option = "")
static Int_t	ParticleCharge(Int_t iType)
static Int_t	ParticleCode(Int_t iType)
static const char*	ParticleLatexName(Int_t iType)
static Float_t	ParticleMass(Int_t iType)
static Float_t	ParticleMassZ(Int_t iType)
static const char*	ParticleName(Int_t iType)
static const char*	ParticleShortName(Int_t iType)
virtual void	TObject::Pop()
virtual void	TObject::Print(Option_t* option = "") const
virtual Int_t	TObject::Read(const char* name)
virtual void	TObject::RecursiveRemove(TObject* obj)
void	TObject::ResetBit(UInt_t f)
virtual void	TObject::SaveAs(const char* filename = "", Option_t* option = "") constMENU
virtual void	TObject::SavePrimitive(basic_ostream<char,char_traits<char> >& out, Option_t* option = "")
void	TObject::SetBit(UInt_t f)
void	TObject::SetBit(UInt_t f, Bool_t set)
virtual void	TObject::SetDrawOption(Option_t* option = "")MENU
static void	TObject::SetDtorOnly(void* obj)
static void	TObject::SetObjectStat(Bool_t stat)
static void	SetPrior(AliPID::EParticleType iType, Double_t prior)
static void	SetPriors(const Double_t* prior, Bool_t charged = kTRUE)
void	SetProbabilities(const Double_t* probabilities, Bool_t charged = kTRUE)
virtual void	TObject::SetUniqueID(UInt_t uid)
virtual void	ShowMembers(TMemberInspector&)
virtual void	Streamer(TBuffer&)
void	StreamerNVirtual(TBuffer& ClassDef_StreamerNVirtual_b)
virtual void	TObject::SysError(const char* method, const char* msgfmt) const
Bool_t	TObject::TestBit(UInt_t f) const
Int_t	TObject::TestBits(UInt_t f) const
virtual void	TObject::UseCurrentStyle()
virtual void	TObject::Warning(const char* method, const char* msgfmt) const
virtual Int_t	TObject::Write(const char* name = 0, Int_t option = 0, Int_t bufsize = 0)
virtual Int_t	TObject::Write(const char* name = 0, Int_t option = 0, Int_t bufsize = 0) const

protected:

virtual void	TObject::DoError(int level, const char* location, const char* fmt, va_list va) const
void	TObject::MakeZombie()

private:

static void

Init()

Data Members

public:

enum {	kSPECIES
	kSPECIESC
	kSPECIESCN
};
enum EParticleType {	kElectron
	kMuon
	kPion
	kKaon
	kProton
	kDeuteron
	kTriton
	kHe3
	kAlpha
	kPhoton
	kPi0
	kNeutron
	kKaon0
	kEleCon
	kUnknown
};
enum TObject::EStatusBits {	kCanDelete
	kMustCleanup
	kObjInCanvas
	kIsReferenced
	kHasUUID
	kCannotPick
	kNoContextMenu
	kInvalidObject
};
enum TObject::[unnamed] {	kIsOnHeap
	kNotDeleted
	kZombie
	kBitMask
	kSingleKey
	kOverwrite
	kWriteDelete
};

private:

Bool_t	fCharged	flag for charged/neutral
Double_t	fProbDensity[14]	probability densities
static Double_t	fgPrior[14]	a priori probabilities
static Char_t	fgkParticleCharge[15]	particle charge (in e units!)
static const Int_t	fgkParticleCode[15]	particle codes
static const char*	fgkParticleLatexName[15]	particle names
static Float_t	fgkParticleMass[15]	particle masses
static Float_t	fgkParticleMassZ[15]	particle masses/charge
static const char*	fgkParticleName[15]	particle names
static const char*	fgkParticleShortName[15]	particle names

Class Charts

Inheritance Chart:

TObject

←

AliPID

Function documentation

AliPID()

 Default constructor

AliPID(const Double_t* probDensity, Bool_t charged = kTRUE)

 Standard constructor

AliPID(const Float_t* probDensity, Bool_t charged = kTRUE)

 Standard constructor

AliPID(const AliPID& pid)

 copy constructor

 We do not call init here, MUST already be done

void SetProbabilities(const Double_t* probabilities, Bool_t charged = kTRUE)

 Set the probability densities

void Init()

 Initialise the masses, charges

 Initialise only once...

Double_t GetProbability(AliPID::EParticleType iType, const Double_t* prior) const

 Get the probability to be a particle of type "iType"
 assuming the a priori probabilities "prior"

Double_t GetProbability(AliPID::EParticleType iType) const

 get the probability to be a particle of type "iType"
 assuming the globaly set a priori probabilities

void GetProbabilities(Double_t* probabilities, const Double_t* prior) const

 get the probabilities to be a particle of given type
 assuming the a priori probabilities "prior"

void GetProbabilities(Double_t* probabilities) const

 get the probabilities to be a particle of given type
 assuming the globaly set a priori probabilities

void SetPriors(const Double_t* prior, Bool_t charged = kTRUE)

 use the given priors as global a priori probabilities

void SetPrior(AliPID::EParticleType iType, Double_t prior)

 use the given prior as global a priori probability for particles
 of type "iType"

Int_t ParticleCharge(Int_t iType)

Float_t ParticleMass(Int_t iType)

Float_t ParticleMassZ(Int_t iType)

const char* ParticleName(Int_t iType)

{return fgkParticleName[iType];}

const char* ParticleShortName(Int_t iType)

{return fgkParticleShortName[iType];}

const char* ParticleLatexName(Int_t iType)

{return fgkParticleLatexName[iType];}

Int_t ParticleCode(Int_t iType)

{return fgkParticleCode[iType];}

EParticleType GetMostProbable(const Double_t* prior) const

EParticleType GetMostProbable() const