A class to represent pairs of points. More...

Inheritance diagram for StEEmcPair:

Public Member Functions
	StEEmcPair ()
	Default constructor (don't use except for placeholder)

	StEEmcPair (const StEEmcPoint &p1, const StEEmcPoint &p2)

	StEEmcPair (const StEEmcPoint &p1, const StEEmcPoint &p2, const TVector3 &vertex)
	Reconstruct a pair of real photons with a common vertex.

	StEEmcPair (const StEEmcPoint &p1, const StEEmcPoint &p2, const TVector3 &vertex1, const TVector3 &vertex2)
	Reconstruct a mixed-event pair with vertex from each event. More...

virtual	~StEEmcPair ()
	Destructor.

	StEEmcPair (const StEEmcPair &old)
	Copy constructor. More...

const StEEmcPoint &	point (Int_t index) const

Float_t	mass () const
	Returns invariant mass of pair.

Float_t	energy () const
	Returns energy of pair.

Float_t	zgg () const
	Returns energy-sharing of pair.

Float_t	phigg () const
	Returns opening-angle of pair.

Float_t	pt () const
	Returns pt of pair.

const TVector3 &	momentum () const
	Returns momentum of pair.

const TVector3 &	vertex () const
	Returns vertex of pair.

void	print () const
	Prints a one-line summary of the pair.

	StEEmcPair ()
	Default constructor (don't use except for placeholder)

	StEEmcPair (StEEmcPoint p1, StEEmcPoint p2)

	StEEmcPair (StEEmcPoint p1, StEEmcPoint p2, TVector3 vertex)
	Reconstruct a pair of real photons with a common vertex.

	StEEmcPair (StEEmcPoint p1, StEEmcPoint p2, TVector3 vertex1, TVector3 vertex2)
	Reconstruct a mixed-event pair with vertex from each event. More...

	~StEEmcPair ()
	Destructor.

	StEEmcPair (const StEEmcPair &old)
	Copy constructor.

StEEmcPoint	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.

TVector3	momentum ()
	Returns momentum of pair.

TVector3	vertex ()
	Returns vertex of pair.

Protected Member Functions
void	Kinematics ()
	Called by constructor to reconstruct two-body kinematics. More...

	ClassDef (StEEmcPair, 1)
	Makes class available in root.

void	Kinematics ()

	ClassDef (StEEmcPair, 1)

Protected Attributes
Float_t	mMass

Float_t	mEnergy

Float_t	mZgg

Float_t	mPhigg

TVector3	mMomentum

TVector3	mVertex1

TVector3	mVertex2

TVector3	mVertex

StEEmcPoint	mPoint [2]

Detailed Description

A class to represent pairs of points.

StEEmcPair is a class which represents the pairing of two EEMC points. The constructor takes in two points and (up to) two vertices. The two-body decay kinematics are computed at the average z-vertex.

When mixing real pi0 pair candidates, we use a common vertex. When a combinatoric background is being mixed, we have the option to use two seperate vertices. Whether this is the optimal solution or not should be studied.

Author: Weihong He

StEEmcPair is a class which represents the pairing of two EEMC points. The constructor takes in two points and (up to) two vertices. The two-body decay kinematics are computed at the average z-vertex.

When mixing real pi0 pair candidates, we use a common vertex. When a combinatoric background is being mixed, we have the option to use two seperate vertices. Whether this is the optimal solution or not should be studied.