xAOD::CaloTower_v1 Class Reference

Object representing calorimeter signal towers. More...

#include <CaloTower_v1.h>

Inheritance diagram for xAOD::CaloTower_v1:

Public Types
enum	{ INVALIDINDEX = -1 }
Public Member Functions
	CaloTower_v1 ()
	Default constructor.
	~CaloTower_v1 ()
	Destructor.
void	reset ()
	Reset function.
void	addEnergy (double energy)
	Add energy.
void	setEnergy (double energy)
	Sets the energy.
Kinematic accessors (@c IParticle interface)

virtual double	pt () const
	transverse momentum $p_{\mathrm{T}}$
virtual double	eta () const
	pseudorapidity $\eta$ $
virtual double	phi () const
	azimuth $\phi$
virtual double	rapidity () const
	rapidity
virtual double	m () const
	mass (by convention)
virtual double	e () const
	energy
virtual const IParticle::FourMom_t &	p4 () const
	Four-momentum representation.
Implementations of the other @c IParticle interface methods

virtual Type::ObjectType	type () const
	object type - presently `Type::Other` (FIXME)

Detailed Description

Object representing calorimeter signal towers.

!

This object represents calorimeter energy towers located on a regular grid in azimuth and pseudorapidity. The grid is associated with the xAOD::CaloTowerContainer_v1. Due to the minimalistic underlying storage model, xAOD::CaloTower_v1 objects are only completely described if allocated in its container.

General kinematic features --------------------------

Kinematic features of calorimeter towers are (1) they are massless, and (2) their direction is given by the center of the $(\eta,\phi)$ bin they represent. This means that $(\eta,\phi)$ for any given shower never changes, only its energy content is dynamic.

The full four-momentum of the calorimeter tower is calculated from its energy and direction { /// (E,,) (E=p,p_{x},p_{y},p_{z}) /// }

Formally, this can be considered a massless pseudoparticle. If the net energy of the tower is negative, no physically meaningful four-momentum can be constructed (see below), rather the tower is represented by $ (0.,0., 0., 0.) $ .

Treatment of negative energy towers -----------------------------------

Negative energy towers cannot provide a four-momentum, but still contain valuable data. The direction $( \eta, \phi )$ are independent of the value and sign of the tower energy, as towers are located at a fixed location in this space. The tower energy is provided independent of its sign as well. This means the xAOD::CaloTower_v1::e(), xAOD::CaloTower_v1::eta(), and xAOD::CaloTower_v1::phi() methods return correct information. In addition, the xAOD::CaloTower_v1::m() and xAOD::CaloTower_v1::rapidity() methods provide meaningful information as well, with rapidity $y = \eta$ due to tower mass $ m = 0 $ .

Constructor & Destructor Documentation

xAOD::CaloTower_v1::CaloTower_v1 ( )

Default constructor.

Constructs empty xAOD::CaloTower_v1 object.

Member Function Documentation

void xAOD::CaloTower_v1::addEnergy ( double energy )

Add energy.

Parameters:

[in] energy value added to tower energy

void xAOD::CaloTower_v1::reset ( )

Reset function.

Sets the tower energy to zero. Indices/directions associated with this object are not changed.

void xAOD::CaloTower_v1::setEnergy ( double energy )

Sets the energy.

Parameters:

[in] energy value to which the tower energy will be set to

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

/cvmfs/atlas.cern.ch/repo/sw/ASG/AnalysisBase/2.4.31/xAODCaloEvent/xAODCaloEvent/versions/CaloTower_v1.h
/cvmfs/atlas.cern.ch/repo/sw/ASG/AnalysisBase/2.4.31/xAODCaloEvent/Root/CaloTower_v1.cxx

xAOD::CaloTower_v1 Class Reference

Public Types

Public Member Functions

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation