StEEmcIUPair Class Reference

Inheritance diagram for StEEmcIUPair:

Public Member Functions
	StEEmcIUPair ()
	Default constructor (don't use except for placeholder)
	StEEmcIUPair (StEEmcIUPoint p1, StEEmcIUPoint p2)
	StEEmcIUPair (StEEmcIUPoint p1, StEEmcIUPoint p2, TVector3 vertex)
	Reconstruct a pair of real photons with a common vertex.
	StEEmcIUPair (StEEmcIUPoint p1, StEEmcIUPoint p2, TVector3 vertex1, TVector3 vertex2)
	Reconstruct a mixed-event pair with vertex from each event. More...
	~StEEmcIUPair ()
	Destructor.
	StEEmcIUPair (const StEEmcIUPair &old)
	Copy constructor. More...
StEEmcIUPoint	point (Int_t index)
Float_t	mass ()
	Returns invariant mass of pair.
Float_t	energy ()
	Returns energy of pair.
Float_t	zgg ()
	Returns energy-sharing of pair.
Float_t	phigg ()
	Returns opening-angle of pair.
Float_t	pt ()
	Returns pt of pair.
Float_t	pz ()
TVector3	momentum ()
	Returns momentum of pair.
TVector3	vertex ()
	Returns vertex of pair.
void	print ()
	Prints a one-line summary of the pair.

Protected Member Functions
void	Kinematics ()
	Called by constructor to reconstruct two-body kinematics. More...
	ClassDef (StEEmcIUPair, 1)
	Makes class available in root.

Protected Attributes
Float_t	mMass
Float_t	mEnergy
Float_t	mZgg
Float_t	mPhigg
TVector3	mMomentum
TVector3	mVertex1
TVector3	mVertex2
TVector3	mVertex
StEEmcIUPoint	mPoint [2]

Detailed Description

Definition at line 9 of file StEEmcIUPair.h.

Constructor & Destructor Documentation

StEEmcIUPair::StEEmcIUPair	(	StEEmcIUPoint	p1,
		StEEmcIUPoint	p2
	)

Reconstruct point pairs where vertex doesn't matter or isn't available (i.e. in production)

Definition at line 38 of file StEEmcIUPair.cxx.

References StEEmcIUPair().

StEEmcIUPair::StEEmcIUPair	(	StEEmcIUPoint	p1,
		StEEmcIUPoint	p2,
		TVector3	vertex1,
		TVector3	vertex2
	)

Reconstruct a mixed-event pair with vertex from each event.

initialize to zero

compute kinematics

Definition at line 48 of file StEEmcIUPair.cxx.

References Kinematics(), mEnergy, mMass, mMomentum, mPhigg, mPoint, mVertex1, mVertex2, and mZgg.

StEEmcIUPair::StEEmcIUPair

(

const StEEmcIUPair &

old

)

Copy constructor.

initialize to zero

kompute kinematics

Definition at line 103 of file StEEmcIUPair.cxx.

References Kinematics(), mEnergy, mMass, mMomentum, mPhigg, mPoint, mVertex1, mVertex2, and mZgg.

Member Function Documentation

void StEEmcIUPair::Kinematics ( )

protected

Called by constructor to reconstruct two-body kinematics.

Determine energy of candidate meson

Energy sharing

Momenta of each gamma

Opening angle between gammas

Total momentum

Set the "mean" vertex

Calculate invariant mass

Definition at line 66 of file StEEmcIUPair.cxx.

References StEEmcIUPoint::energy(), energy(), mEnergy, mMass, mMomentum, mPhigg, mPoint, mVertex, mVertex1, mVertex2, mZgg, and StEEmcIUPoint::position().

Referenced by StEEmcIUPair().

StEEmcIUPoint StEEmcIUPair::point ( Int_t  index )

inline

Returns specified point

Parameters

index

[0,1]

Definition at line 30 of file StEEmcIUPair.h.

References mPoint.

Referenced by StEEmcIUPi0Analysis::accept(), StEEmcIUMixMaker::fillQA(), StEEmcIUPi0Analysis::Make(), and StEEmcIUPi0Analysis::twoBodyCut().

Member Data Documentation

Float_t StEEmcIUPair::mEnergy

protected

• total energy

Definition at line 58 of file StEEmcIUPair.h.

Referenced by energy(), Kinematics(), and StEEmcIUPair().

Float_t StEEmcIUPair::mMass

protected

• invariant mass

Definition at line 57 of file StEEmcIUPair.h.

Referenced by Kinematics(), mass(), and StEEmcIUPair().

TVector3 StEEmcIUPair::mMomentum

protected

• self-evident

Definition at line 61 of file StEEmcIUPair.h.

Referenced by Kinematics(), momentum(), pt(), and StEEmcIUPair().

Float_t StEEmcIUPair::mPhigg

protected

• opening-angle

Definition at line 60 of file StEEmcIUPair.h.

Referenced by Kinematics(), phigg(), and StEEmcIUPair().

StEEmcIUPoint StEEmcIUPair::mPoint[2]

protected

• points

Definition at line 67 of file StEEmcIUPair.h.

Referenced by Kinematics(), point(), print(), and StEEmcIUPair().

TVector3 StEEmcIUPair::mVertex

protected

• event vertex (real pi0), average vertex (mixed)

Definition at line 65 of file StEEmcIUPair.h.

Referenced by Kinematics(), print(), and vertex().

TVector3 StEEmcIUPair::mVertex1

protected

• vertex of first point

Definition at line 63 of file StEEmcIUPair.h.

Referenced by Kinematics(), and StEEmcIUPair().

TVector3 StEEmcIUPair::mVertex2

protected

• vertex of second point (different for background mix)

Definition at line 64 of file StEEmcIUPair.h.

Referenced by Kinematics(), and StEEmcIUPair().

Float_t StEEmcIUPair::mZgg

protected

• energy-sharing

Definition at line 59 of file StEEmcIUPair.h.

Referenced by Kinematics(), StEEmcIUPair(), and zgg().

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

• StEEmcPool/StEEmcIUPi0/StEEmcIUPair.h
• StEEmcPool/StEEmcIUPi0/StEEmcIUPair.cxx