xAOD::CaloTower_v1 Class Reference

Object representing calorimeter signal towers. More...

#include <CaloTower_v1.h>

Inheritance diagram for xAOD::CaloTower_v1:
xAOD::IParticle SG::AuxElement SG::IAuxElement

List of all members.

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 $ y $
virtual double m () const
 mass $ m = 0 $ (by convention)
virtual double e () const
 energy $ E $
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
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