PYTHIA  8.303
Public Member Functions | List of all members
BlackSubCollisionModel Class Reference

#include <HIUserHooks.h>

Inheritance diagram for BlackSubCollisionModel:

Public Member Functions

 BlackSubCollisionModel ()
virtual ~BlackSubCollisionModel ()
 Virtual destructor,.
virtual multiset< SubCollisiongetCollisions (vector< Nucleon > &proj, vector< Nucleon > &targ, const Vec4 &bvec, double &T)
- Public Member Functions inherited from SubCollisionModel
 SubCollisionModel ()
 The default constructor is empty.
virtual ~SubCollisionModel ()
 Virtual destructor,.
virtual bool init ()
 Virtual init method. More...
void initPtr (NucleusModel &projIn, NucleusModel &targIn, SigmaTotal &sigTotIn, Settings &settingsIn, Info &infoIn, Rndm &rndIn)
double sigTot () const
 The total cross section. More...
double sigEl () const
 The total cross section.
double sigCDE () const
 The central diffractive excitation cross section.
double sigSDE () const
 The single diffractive excitation cross section (both sides summed).
double sigSDEP () const
 The single diffractive excitation cross section (excited projectile).
double sigSDET () const
 The single diffractive excitation cross section (excited target).
double sigDDE () const
 The double diffractive excitation cross section.
double sigND () const
 The non-diffractive (absorptive) cross section.
double bSlope () const
 The elastic b-slope parameter.
virtual SigEst getSig () const
 Calculate the cross sections for the given set of parameters.
double avNDB () const
 Return the average non-diffractive impact parameter.
double Chi2 (const SigEst &sigs, int npar) const
 Calculate the Chi2 for the given cross section estimates. More...
virtual bool evolve ()
 Use a simlified genetic algorithm to fit the parameters. More...
virtual void setParm (const vector< double > &)
 Set the parameters of this model.
virtual vector< double > getParm () const
virtual vector< double > minParm () const
virtual vector< double > maxParm () const

Additional Inherited Members

- Protected Attributes inherited from SubCollisionModel
int NInt
int NGen
int NPop
double sigFuzz
bool fitPrint
double avNDb
 Info from the controlling HeavyIons object.

Detailed Description

The most naive sub-collision model, asuming static nucleons and the absorptive cross section equal to the total inelastic. No fluctuations, meaning no diffraction.

Constructor & Destructor Documentation

The default constructor simply lists the nucleon-nucleon cross sections.

Member Function Documentation

multiset< SubCollision > getCollisions ( vector< Nucleon > &  proj,
vector< Nucleon > &  targ,
const Vec4 bvec,
double &  T 

Take two vectors of Nucleons and an impact parameter vector and produce the corrsponding sub-collisions. Note that states of the nucleons may be changed.

The BlackSubCollisionModel uses fixed size, black-disk nucleon-nucleon cross section, equal to the total inelastic pp cross section. Everything else is elastic – Diffraction not included.

Always call base class to reset nucleons and shift them into position.

Go through all pairs of nucleons

The naive cross section only gets the total xsec correct.

Implements SubCollisionModel.

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