InitialParticleGeneration Class Reference

Generate Collision. More...

#include <InitialParticleGeneration.h>

Public Member Functions
	InitialParticleGeneration (int allowedFlags=0)
	constructor
MCInitialParticles &	generate ()
	Generate a new event.
ROOT::Math::XYZVector	getVertexConditional ()
	Generate vertex position and possibly update the generator of Lorentz transformation.
ROOT::Math::XYZVector	updateVertex (bool force=false)
	Update the vertex position:
const BeamParameters &	getBeamParameters () const
	Return reference to nominal beam parameters.
void	initialize ()
	function to be executed on initialize()
void	setAllowedFlags (int allowedFlags)
	Set allowed flags.
ConditionalGaussGenerator	initConditionalGenerator (const ROOT::Math::PxPyPzEVector &pHER, const ROOT::Math::PxPyPzEVector &pLER, const TMatrixDSym &covHER, const TMatrixDSym &covLER)
	Initialize the conditional generator using HER & LER 4-vectors and HER & LER covariance matrices describing spread.
double	getNominalEcms ()
	Get the CMS energy of collisions.
double	getNominalEcmsSpread ()
	Get spread of CMS collision energy calculated from beam parameters.
const ConditionalGaussGenerator &	getLorentzGenerator ()
	Get the generator for the Lorentz transformation.

Private Member Functions
MCInitialParticles &	generate (int allowedFlags)
	Generate a new event wit a particular set of allowed flags.
TMatrixDSym	adjustCovMatrix (TMatrixDSym cov) const
	adjust smearing covariance matrix based on the generation flags
ROOT::Math::XYZVector	generateVertex (const ROOT::Math::XYZVector &initial, const TMatrixDSym &cov, MultivariateNormalGenerator &gen) const
	generate the vertex
ROOT::Math::PxPyPzEVector	generateBeam (const ROOT::Math::PxPyPzEVector &initial, const TMatrixDSym &cov, MultivariateNormalGenerator &gen) const
	generate 4 vector for one beam

Private Attributes
DBObjPtr< BeamParameters >	m_beamParams
	Datastore object containing the nominal beam parameters.
StoreObjPtr< MCInitialParticles >	m_event
	Datastore object containing the generated event.
MultivariateNormalGenerator	m_generateHER
	Generator for HER.
MultivariateNormalGenerator	m_generateLER
	Generator for LER.
MultivariateNormalGenerator	m_generateVertex
	Generator for Vertex.
ConditionalGaussGenerator	m_generateLorentzTransformation
	Generator of the Lorentz transformation.
int	m_allowedFlags
	Allowed generation flags.

Detailed Description

Generate Collision.

This class is meant to be a common interface to be used by physics generators for generating the initial beam collision.

A generator module should have this class as a member. In each event, a call to generate() will return the initial event information and also automatically put it in the datastore.

Definition at line 35 of file InitialParticleGeneration.h.

Constructor & Destructor Documentation

InitialParticleGeneration()

InitialParticleGeneration ( int  allowedFlags = 0 )

inlineexplicit

constructor

Parameters

allowedFlags

allowed generation flags from MCInitialParticles. Default is to allow no smearing. Generation in CMS is always permitted

Definition at line 41 of file InitialParticleGeneration.h.

: m_allowedFlags(allowedFlags | MCInitialParticles::c_generateCMS) {};

Member Function Documentation

getBeamParameters()

const BeamParameters & getBeamParameters ( ) const

inline

Return reference to nominal beam parameters.

Definition at line 69 of file InitialParticleGeneration.h.

{ return *m_beamParams; }

getLorentzGenerator()

const ConditionalGaussGenerator & getLorentzGenerator ( )

inline

Get the generator for the Lorentz transformation.

Definition at line 91 of file InitialParticleGeneration.h.

{ return m_generateLorentzTransformation; }

getNominalEcms()

double getNominalEcms ( )

inline

Get the CMS energy of collisions.

Definition at line 85 of file InitialParticleGeneration.h.

{ return m_beamParams->getMass(); }

getNominalEcmsSpread()

double getNominalEcmsSpread ( )

inline

Get spread of CMS collision energy calculated from beam parameters.

Definition at line 88 of file InitialParticleGeneration.h.

{ return  m_generateLorentzTransformation.getX0spread(); }

setAllowedFlags()

void setAllowedFlags ( int  allowedFlags )

inline

Set allowed flags.

Definition at line 75 of file InitialParticleGeneration.h.

    {
      m_allowedFlags = allowedFlags | MCInitialParticles::c_generateCMS;
    }

Member Data Documentation

m_allowedFlags

int m_allowedFlags

private

Allowed generation flags.

Definition at line 134 of file InitialParticleGeneration.h.

m_beamParams

DBObjPtr<BeamParameters> m_beamParams

private

Datastore object containing the nominal beam parameters.

Definition at line 120 of file InitialParticleGeneration.h.

m_event

StoreObjPtr<MCInitialParticles> m_event

private

Datastore object containing the generated event.

Definition at line 122 of file InitialParticleGeneration.h.

m_generateHER

MultivariateNormalGenerator m_generateHER

private

Generator for HER.

Definition at line 124 of file InitialParticleGeneration.h.

m_generateLER

MultivariateNormalGenerator m_generateLER

private

Generator for LER.

Definition at line 126 of file InitialParticleGeneration.h.

m_generateLorentzTransformation

ConditionalGaussGenerator m_generateLorentzTransformation

private

Generator of the Lorentz transformation.

Definition at line 131 of file InitialParticleGeneration.h.

m_generateVertex

MultivariateNormalGenerator m_generateVertex

private

Generator for Vertex.

Definition at line 128 of file InitialParticleGeneration.h.

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

• generators/utilities/include/InitialParticleGeneration.h
• generators/utilities/src/InitialParticleGeneration.cc