Belle II Software  release-08-01-10
Public Member Functions | Static Public Member Functions | Private Attributes | List of all members
PCmsLabTransform Class Reference
Packages » analysis

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

#include <PCmsLabTransform.h>

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Public Member Functions

 PCmsLabTransform ()
 Constructor.
 
B2Vector3D getBoostVector () const
 Returns boost vector (beta=p/E)
 
double getCMSEnergy () const
 Returns CMS energy of e+e- (aka. More...
 
ROOT::Math::PxPyPzEVector getBeamFourMomentum () const
 Returns LAB four-momentum of e+e-, i.e. More...
 
const ROOT::Math::LorentzRotation rotateLabToCms () const
 Returns Lorentz transformation from Lab to CMS. More...
 
const ROOT::Math::LorentzRotation rotateCmsToLab () const
 Returns Lorentz transformation from CMS to Lab. More...
 

Static Public Member Functions

static ROOT::Math::PxPyPzMVector labToCms (const ROOT::Math::PxPyPzMVector &vec)
 Transforms Lorentz vector into CM System. More...
 
static ROOT::Math::PxPyPzMVector cmsToLab (const ROOT::Math::PxPyPzMVector &vec)
 Transforms Lorentz vector into Laboratory System. More...
 
static ROOT::Math::PxPyPzEVector labToCms (const ROOT::Math::PxPyPzEVector &vec)
 Transforms Lorentz vector into CM System. More...
 
static ROOT::Math::PxPyPzEVector cmsToLab (const ROOT::Math::PxPyPzEVector &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.
 
const DBObjPtr< CollisionAxisCMS > m_axisCmsDB
 db object for collision axis in CM system from boost.
 

Detailed Description

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

Definition at line 31 of file PCmsLabTransform.h.

Member Function Documentation

◆ cmsToLab() [1/2]

ROOT::Math::PxPyPzEVector cmsToLab ( const ROOT::Math::PxPyPzEVector &  vec)
static

Transforms Lorentz vector into Laboratory System.

Parameters
vecLorentz vector in CM System
Returns
Lorentz vector in Laboratory System

Definition at line 31 of file PCmsLabTransform.cc.

32 {
33  PCmsLabTransform T;
34  return T.rotateCmsToLab() * vector;
35 }
Belle2::PCmsLabTransform
Class to hold Lorentz transformations from/to CMS and boost vector.
Definition: PCmsLabTransform.h:31
Belle2::PCmsLabTransform::rotateCmsToLab
const ROOT::Math::LorentzRotation rotateCmsToLab() const
Returns Lorentz transformation from CMS to Lab.
Definition: PCmsLabTransform.h:97

◆ cmsToLab() [2/2]

ROOT::Math::PxPyPzMVector cmsToLab ( const ROOT::Math::PxPyPzMVector &  vec)
static

Transforms Lorentz vector into Laboratory System.

Parameters
vecLorentz vector in CM System
Returns
Lorentz vector in Laboratory System

Definition at line 19 of file PCmsLabTransform.cc.

◆ getBeamFourMomentum()

ROOT::Math::PxPyPzEVector getBeamFourMomentum ( ) const
inline

Returns LAB four-momentum of e+e-, i.e.

pHER + pLER

Definition at line 59 of file PCmsLabTransform.h.

60  {
61  return rotateCmsToLab() * ROOT::Math::PxPyPzEVector(0, 0, 0, getCMSEnergy());
62  }
Belle2::PCmsLabTransform::getCMSEnergy
double getCMSEnergy() const
Returns CMS energy of e+e- (aka.
Definition: PCmsLabTransform.h:51

◆ getCMSEnergy()

double getCMSEnergy ( ) const
inline

Returns CMS energy of e+e- (aka.

invariant mass in any system)

Definition at line 51 of file PCmsLabTransform.h.

◆ labToCms() [1/2]

ROOT::Math::PxPyPzEVector labToCms ( const ROOT::Math::PxPyPzEVector &  vec)
static

Transforms Lorentz vector into CM System.

Parameters
vecLorentz vector in Laboratory System
Returns
Lorentz vector in CM System

Definition at line 25 of file PCmsLabTransform.cc.

◆ labToCms() [2/2]

ROOT::Math::PxPyPzMVector labToCms ( const ROOT::Math::PxPyPzMVector &  vec)
static

Transforms Lorentz vector into CM System.

Parameters
vecLorentz vector in Laboratory System
Returns
Lorentz vector in CM System

Definition at line 13 of file PCmsLabTransform.cc.

◆ rotateCmsToLab()

const ROOT::Math::LorentzRotation rotateCmsToLab ( ) const
inline

Returns Lorentz transformation from CMS to Lab.

Returns
const reference to Lorentz rotation matrix

Definition at line 97 of file PCmsLabTransform.h.

◆ rotateLabToCms()

const ROOT::Math::LorentzRotation rotateLabToCms ( ) const
inline

Returns Lorentz transformation from Lab to CMS.

Returns
const reference to Lorentz rotation matrix Similar transformation done in MCInitialParticles::calculateBoost()

Definition at line 69 of file PCmsLabTransform.h.

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