PCmsLabTransform Class Reference

Class to hold Lorentz transformations from/to CMS and boost vector. More...

#include <PCmsLabTransform.h>

Collaboration diagram for PCmsLabTransform:

Public Member Functions
	PCmsLabTransform ()
	Constructor.
TVector3	getBoostVector () const
	Returns boost vector (beta=p/E)
double	getCMSEnergy () const
	Returns CMS energy of e+e- (aka. More...
TLorentzVector	getBeamFourMomentum () const
	Returns LAB four-momentum of e+e-.
const TLorentzRotation	rotateLabToCms () const
	Returns Lorentz transformation from Lab to CMS. More...
const TLorentzRotation	rotateCmsToLab () const
	Returns Lorentz transformation from CMS to Lab. More...

Static Public Member Functions
static TLorentzVector	labToCms (const TLorentzVector &vec)
	Transforms Lorentz vector into CM System. More...
static TLorentzVector	cmsToLab (const TLorentzVector &vec)
	Transforms Lorentz vector into Laboratory System. More...

Private Attributes
const DBObjPtr< CollisionInvariantMass >	m_invariantMassDB
	db object for invariant mass.
const DBObjPtr< CollisionBoostVector >	m_boostVectorDB
	db object for boost vector.

Detailed Description

Class to hold Lorentz transformations from/to CMS and boost vector.

Definition at line 37 of file PCmsLabTransform.h.

Member Function Documentation

cmsToLab()

TLorentzVector cmsToLab ( const TLorentzVector &  vec )

static

Transforms Lorentz vector into Laboratory System.

Parameters

vec	Lorentz vector in CM System

Returns

Lorentz vector in Laboratory System

Definition at line 21 of file PCmsLabTransform.cc.

{
  PCmsLabTransform T;
  return T.rotateCmsToLab() * vector;
}

getCMSEnergy()

double getCMSEnergy ( ) const

inline

Returns CMS energy of e+e- (aka.

invariant mass in any system)

Definition at line 57 of file PCmsLabTransform.h.

    {
      return rotateCmsToLab() * TLorentzVector(0, 0, 0, getCMSEnergy());
    }

labToCms()

TLorentzVector labToCms ( const TLorentzVector &  vec )

static

Transforms Lorentz vector into CM System.

Parameters

vec	Lorentz vector in Laboratory System

Returns

Lorentz vector in CM System

Definition at line 15 of file PCmsLabTransform.cc.

rotateCmsToLab()

const TLorentzRotation rotateCmsToLab ( ) const

inline

Returns Lorentz transformation from CMS to Lab.

Returns

const reference to Lorentz rotation matrix

Definition at line 84 of file PCmsLabTransform.h.

rotateLabToCms()

const TLorentzRotation rotateLabToCms ( ) const

inline

Returns Lorentz transformation from Lab to CMS.

Returns

const reference to Lorentz rotation matrix

Definition at line 74 of file PCmsLabTransform.h.

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

• analysis/utility/include/PCmsLabTransform.h
• analysis/utility/src/PCmsLabTransform.cc