smash::TwoBodyDecayDilepton Class Reference

#include <decaytype.h>

TwoBodyDecayDilepton represents a decay with a lepton and its antilepton as the final-state particles.

Definition at line 269 of file decaytype.h.

Inheritance diagram for smash::TwoBodyDecayDilepton:

Collaboration diagram for smash::TwoBodyDecayDilepton:

Public Member Functions
	TwoBodyDecayDilepton (ParticleTypePtrList part_types, int l)
	Construct a TwoBodyDecayDilepton. More...
double	width (double m0, double G0, double m) const override
	Get the mass-dependent width of a two-body decay into stable particles according to Manley:1992yb [32]. More...
Public Member Functions inherited from smash::TwoBodyDecayStable
	TwoBodyDecayStable (ParticleTypePtrList part_types, int l)
	Construct a TwoBodyDecayStable. More...
double	in_width (double m0, double G0, double m, double m1, double m2) const override
	Get the mass-dependent in-width for a resonance formation process from two stable particles according to Manley:1992yb [32], see also Effenberger:1999wlg [18], eq. More...
Public Member Functions inherited from smash::TwoBodyDecay
	TwoBodyDecay (ParticleTypePtrList part_types, int l)
	Construct a TwoBodyDecay. More...
unsigned int	particle_number () const override
bool	has_particles (ParticleTypePtrList list) const override
double	threshold () const
Public Member Functions inherited from smash::DecayType
	DecayType (ParticleTypePtrList part_types, int l)
	Construct a DecayType. More...
virtual	~DecayType ()=default
	Virtual Destructor. More...
virtual bool	has_mother (ParticleTypePtr mother) const
const ParticleTypePtrList &	particle_types () const
int	angular_momentum () const

Additional Inherited Members
Protected Member Functions inherited from smash::TwoBodyDecayStable
double	rho (double m) const override
	This is a virtual helper method which is used to write the width as Gamma(m) = Gamma_0 * rho(m) / rho(m_0). More...
Protected Attributes inherited from smash::DecayType
ParticleTypePtrList	particle_types_
	final-state particles of the decay More...
int	L_
	angular momentum of the decay More...

Constructor & Destructor Documentation

TwoBodyDecayDilepton()

smash::TwoBodyDecayDilepton::TwoBodyDecayDilepton	(	ParticleTypePtrList	part_types,
		int	l
	)

Construct a TwoBodyDecayDilepton.

Parameters

[in]	part_types	Final-state particles of the decay.
[in]	l	Angular momentum of the decay.

Returns

The constructed object.

Definition at line 242 of file decaytype.cc.

    : TwoBodyDecayStable(part_types, l) {
  if (!is_dilepton(particle_types_[0]->pdgcode(),
                   particle_types_[1]->pdgcode())) {
    throw std::runtime_error(
        "Error: No dilepton in TwoBodyDecayDilepton constructor: " +
        part_types[0]->pdgcode().string() + " " +
        part_types[1]->pdgcode().string());
  }
}

Here is the call graph for this function:

Member Function Documentation

width()

double smash::TwoBodyDecayDilepton::width ( double  m0, double  G0, double  m  ) const

overridevirtual

Get the mass-dependent width of a two-body decay into stable particles according to Manley:1992yb [32].

Parameters

m0	Pole mass of the decaying particle [GeV].
G0	Partial width at the pole mass [GeV].
m	Actual mass of the decaying particle [GeV].

dilepton decays: use width from Li:1996mi [30], equation (19)

Reimplemented from smash::TwoBodyDecayStable.

Definition at line 254 of file decaytype.cc.

                                                                       {
  if (m <= threshold()) {
    return 0;
  } else {
    const double ml = particle_types_[0]->mass();  // lepton mass
    const double ml_to_m_sqr = (ml / m) * (ml / m);
    const double m0_to_m_cubed = (m0 / m) * (m0 / m) * (m0 / m);
    return G0 * m0_to_m_cubed * std::sqrt(1. - 4. * ml_to_m_sqr) *
           (1. + 2. * ml_to_m_sqr);
  }
}

Here is the call graph for this function:

---

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

• src/include/smash/decaytype.h
• src/decaytype.cc