NAStrangeDensity Class Reference

#include <StrangeDensity.h>

Public Member Functions
	NAStrangeDensity ()
void	SetBaryonPotential (double value)
void	SetNMax (int value)
void	SetStrangePotential (double value)
void	SetTemperature (double value)
double	StrangenessDensity (DatabasePDG *database)
	~NAStrangeDensity ()

Private Member Functions
double	ParticleNumberDensity (ParticlePDG *particle)

Private Attributes
double	fBaryonPotential
int	fNMax
double	fStrangePotential
double	fTemperature

Detailed Description

Definition at line 23 of file StrangeDensity.h.

Constructor & Destructor Documentation

NAStrangeDensity::NAStrangeDensity

(

)

Definition at line 4 of file StrangeDensity.cc.

References fBaryonPotential, fNMax, fStrangePotential, fTemperature, and GeV.

                                   {
  fTemperature = 0. * GeV;
  fBaryonPotential = 0. * GeV;
  fStrangePotential = 0. * GeV;
  fNMax = 5;
}

NAStrangeDensity::~NAStrangeDensity ( )

inline

Definition at line 36 of file StrangeDensity.h.

{};

Member Function Documentation

double NAStrangeDensity::ParticleNumberDensity ( ParticlePDG *  particle )

private

Definition at line 22 of file StrangeDensity.cc.

References ztail::d, JetChargeProducer_cfi::exp, fBaryonPotential, fNMax, fStrangePotential, fTemperature, ParticlePDG::GetBaryonNumber(), ParticlePDG::GetMass(), ParticlePDG::GetSpin(), ParticlePDG::GetStrangeness(), HankelKn(), hbarc, createfilelist::int, dqmiodumpmetadata::n, N_PI, and funct::pow().

Referenced by StrangenessDensity().

                                                                {
  double particleMass = pDef->GetMass();
  int particleStrangeness = int(pDef->GetStrangeness());
  double particleBaryon = pDef->GetBaryonNumber();
  //compute chemical potential
  double particleChemPotential = fBaryonPotential * particleBaryon + fStrangePotential * particleStrangeness;
  //compute degeneracy factor
  double particleDegFactor = 2 * pDef->GetSpin() + 1.;  // IA: In ParticlePDG() GetSpin() returns spin not 2*spin !!
  double d = 1.;                                        //for fermions
  if (int(2 * pDef->GetSpin()) % 2 == 0)  //it gives 0 for Spin = 0,2,4,.. and it gives 1 for Spin = 1,3,7,
    d = -1;                               //for bosons

  double prefactor;
  double postfactor;
  prefactor =
      (particleDegFactor * particleMass * particleMass * fTemperature / hbarc / hbarc / hbarc) / (2. * N_PI * N_PI);
  postfactor = 0.;

  for (int n = 1; n <= fNMax; n++) {
    postfactor += pow(-d, n + 1) / (n)*exp(n * particleChemPotential / fTemperature) *
                  HankelKn(2, n * particleMass / fTemperature);
  }
  return prefactor * postfactor;
}

void NAStrangeDensity::SetBaryonPotential ( double  value )

inline

Definition at line 40 of file StrangeDensity.h.

References relativeConstraints::value.

Referenced by NAStrangePotential::CalculateStrangeDensity().

{ fBaryonPotential = value; }

void NAStrangeDensity::SetNMax ( int  value )

inline

Definition at line 42 of file StrangeDensity.h.

References StrangenessDensity(), and relativeConstraints::value.

                          {
    fNMax = value;
    if (fNMax < 1)
      fNMax = 1;
  }

void NAStrangeDensity::SetStrangePotential ( double  value )

inline

Definition at line 41 of file StrangeDensity.h.

References relativeConstraints::value.

Referenced by NAStrangePotential::CalculateStrangeDensity().

{ fStrangePotential = value; }

void NAStrangeDensity::SetTemperature ( double  value )

inline

Definition at line 39 of file StrangeDensity.h.

References relativeConstraints::value.

Referenced by NAStrangePotential::CalculateStrangeDensity().

{ fTemperature = value; }

double NAStrangeDensity::StrangenessDensity

(

DatabasePDG *

database

)

Definition at line 11 of file StrangeDensity.cc.

References DatabasePDG::GetNParticles(), DatabasePDG::GetPDGParticleByIndex(), ParticlePDG::GetStrangeness(), and ParticleNumberDensity().

Referenced by NAStrangePotential::CalculateStrangeDensity(), and SetNMax().

                                                                 {
  double meanStrangenessDensity = 0.;
  for (int particleIndex = 0; particleIndex < database->GetNParticles(); particleIndex++) {
    ParticlePDG* particle = database->GetPDGParticleByIndex(particleIndex);
    double particleDensity = ParticleNumberDensity(particle);
    meanStrangenessDensity += particleDensity * particle->GetStrangeness();
  }
  return meanStrangenessDensity;
}

Member Data Documentation

double NAStrangeDensity::fBaryonPotential

private

Definition at line 27 of file StrangeDensity.h.

Referenced by NAStrangeDensity(), and ParticleNumberDensity().

int NAStrangeDensity::fNMax

private

Definition at line 29 of file StrangeDensity.h.

Referenced by NAStrangeDensity(), and ParticleNumberDensity().

double NAStrangeDensity::fStrangePotential

private

Definition at line 28 of file StrangeDensity.h.

Referenced by NAStrangeDensity(), and ParticleNumberDensity().

double NAStrangeDensity::fTemperature

private

Definition at line 26 of file StrangeDensity.h.

Referenced by NAStrangeDensity(), and ParticleNumberDensity().