ImpactParameterGenerator Class Reference

#include <HISubCollisionModel.h>

Public Member Functions
	ImpactParameterGenerator ()=default
virtual	~ImpactParameterGenerator ()
	Virtual destructor.
virtual bool	init ()
	Virtual init method. More...
void	initPtr (Info &infoIn, SubCollisionModel &collIn, NucleusModel &projIn, NucleusModel &targIn)
	ImpactParameterGenerator samples the impact parameter space. More...
virtual Vec4	generate (double &weight) const
	Return a new impact parameter and set the corresponding weight provided. More...
virtual double	xSecScale () const
void	width (double widthIn)
	Set the width (in femtometers).
double	width () const
	Get the width.
void	updateWidth ()
	Update width based on the associated subcollision and nucleus models. More...

Protected Attributes
Info *	infoPtr {}
	Pointers from the controlling HeavyIons object.
SubCollisionModel *	collPtr {}
NucleusModel *	projPtr {}
NucleusModel *	targPtr {}
Settings *	settingsPtr {}
Rndm *	rndmPtr {}
Logger *	loggerPtr {}

Detailed Description

ImpactParameterGenerator is able to generate a specific impact parameter together with a weight such that aweighted average over any quantity X(b) corresponds to the infinite integral over d^2b X(b). This base class gives a Gaussian profile, d^2b exp(-b^2/2w^2).

Constructor & Destructor Documentation

ImpactParameterGenerator ( )

default

The default constructor takes a general width (in femtometers) as argument.

Member Function Documentation

Vec4 generate ( double &  weight ) const

virtual

Return a new impact parameter and set the corresponding weight provided.

Generate an impact parameter according to a gaussian distribution.

bool init ( )

virtual

Virtual init method.

Initialise base class, bay be overridden by subclasses.

The width parameter is given in units of femtometer.

For backward compatibility

void initPtr	(	Info &	infoIn,
		SubCollisionModel &	collIn,
		NucleusModel &	projIn,
		NucleusModel &	targIn
	)

ImpactParameterGenerator samples the impact parameter space.

Initialise base class, passing pointers to important objects.

void updateWidth

(

)

Update width based on the associated subcollision and nucleus models.

Set width based on the associated subcollision and nucleus models.

virtual double xSecScale ( ) const

inlinevirtual

Return the scaling of the cross section used together with the weight in genrate() to obtain the cross section. This is by default 1 unless forceUnitWeight is specified.

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

• include/Pythia8/HISubCollisionModel.h
• src/HISubCollisionModel.cc