Nucleus2gamma2 Class Reference

#include <UserPhotonFlux.h>

Inheritance diagram for Nucleus2gamma2:

Collaboration diagram for Nucleus2gamma2:

Public Member Functions
	Nucleus2gamma2 (int idBeamIn)
void	xfUpdate (int, double x, double)
void	setZ (double in_Z)
void	setMinB (double in_min_b)
void	setMinX (double in_min_x)

Private Attributes
double	m_Z
double	m_min_b
double	m_min_x

Static Private Attributes
static constexpr double	M_NUCLEON_EFF =0.9315
static constexpr double	ALPHA_EM =7.2973525664e-3
static constexpr double	HBAR_TIMES_C =0.1973269788

Detailed Description

Definition at line 34 of file UserPhotonFlux.h.

Constructor & Destructor Documentation

Nucleus2gamma2()

Nucleus2gamma2::Nucleus2gamma2 ( int idBeamIn )

inline

Definition at line 40 of file UserPhotonFlux.h.

                               : Pythia8::PDF(idBeamIn),
                m_Z(82.),
                m_min_b(13.24),
                m_min_x(-1)
  {}

Member Function Documentation

setMinB()

void Nucleus2gamma2::setMinB ( double in_min_b )

inline

Definition at line 63 of file UserPhotonFlux.h.

{m_min_b=in_min_b;};

setMinX()

void Nucleus2gamma2::setMinX ( double in_min_x )

inline

Definition at line 64 of file UserPhotonFlux.h.

{m_min_x=in_min_x;};

setZ()

void Nucleus2gamma2::setZ ( double in_Z )

inline

Definition at line 62 of file UserPhotonFlux.h.

{m_Z=in_Z;};

xfUpdate()

void Nucleus2gamma2::xfUpdate ( int , double x, double  )

inline

Definition at line 47 of file UserPhotonFlux.h.

                                         {
 
 
    if(x < m_min_x)
    {
      xgamma=0;
      return;
    }
    using Pythia8::pow2;
    double xi = x * M_NUCLEON_EFF * m_min_b / HBAR_TIMES_C;
    double bK0 = Pythia8::besselK0(xi);
    double bK1 = Pythia8::besselK1(xi);
    double intB = xi * bK1 * bK0 - 0.5 * pow2(xi) * ( pow2(bK1) - pow2(bK0) );
    xgamma = 2. * ALPHA_EM * pow2(m_Z) / M_PI * intB;
  }

Member Data Documentation

ALPHA_EM

double Nucleus2gamma2::ALPHA_EM =7.2973525664e-3

staticconstexprprivate

Definition at line 73 of file UserPhotonFlux.h.

HBAR_TIMES_C

double Nucleus2gamma2::HBAR_TIMES_C =0.1973269788

staticconstexprprivate

Definition at line 74 of file UserPhotonFlux.h.

m_min_b

double Nucleus2gamma2::m_min_b

private

Definition at line 67 of file UserPhotonFlux.h.

m_min_x

double Nucleus2gamma2::m_min_x

private

Definition at line 68 of file UserPhotonFlux.h.

M_NUCLEON_EFF

double Nucleus2gamma2::M_NUCLEON_EFF =0.9315

staticconstexprprivate

Definition at line 72 of file UserPhotonFlux.h.

m_Z

double Nucleus2gamma2::m_Z

private

Definition at line 66 of file UserPhotonFlux.h.

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

• UserPhotonFlux.h