genie::BertuzzoDNuCOHPXSec Class Reference

Differential cross section for v+As coherent elastic scattering.Coherent DNu.
Is a concrete implementation of the XSecAlgorithmI interface.
. More...

#include <BertuzzoDNuCOHPXSec.h>

Inheritance diagram for genie::BertuzzoDNuCOHPXSec:

Public Member Functions
	BertuzzoDNuCOHPXSec ()
	BertuzzoDNuCOHPXSec (string config)
virtual	~BertuzzoDNuCOHPXSec ()
double	XSec (const Interaction *i, KinePhaseSpace_t k) const override
	Compute the cross section for the input interaction. More...
double	Integral (const Interaction *i) const override
bool	ValidProcess (const Interaction *i) const override
	Can this cross section algorithm handle the input process? More...
bool	ValidKinematics (const Interaction *i) const override
	Is the input kinematical point a physically allowed one? More...
void	Configure (const Registry &config) override
void	Configure (string param_set) override
Public Member Functions inherited from genie::XSecAlgorithmI
virtual	~XSecAlgorithmI ()
Public Member Functions inherited from genie::Algorithm
virtual	~Algorithm ()
virtual void	FindConfig (void)
virtual const Registry &	GetConfig (void) const
Registry *	GetOwnedConfig (void)
virtual const AlgId &	Id (void) const
	Get algorithm ID. More...
virtual AlgStatus_t	GetStatus (void) const
	Get algorithm status. More...
virtual bool	AllowReconfig (void) const
virtual AlgCmp_t	Compare (const Algorithm *alg) const
	Compare with input algorithm. More...
virtual void	SetId (const AlgId &id)
	Set algorithm ID. More...
virtual void	SetId (string name, string config)
const Algorithm *	SubAlg (const RgKey &registry_key) const
void	AdoptConfig (void)
void	AdoptSubstructure (void)
virtual void	Print (ostream &stream) const
	Print algorithm info. More...

Private Member Functions
void	LoadConfig (void)

Private Attributes
const XSecIntegratorI *	fXSecIntegrator
	cross section integrator More...
const EngelFormFactor *	fFF
	Engel Form Factor algorithm. More...
double	fEps2
std::array< double, 4 >	fMixing2s
double	fAlpha_D
double	fDNuMass
double	fDNuMass2
double	fDMediatorMass
double	fDMediatorMass2

Additional Inherited Members
Static Public Member Functions inherited from genie::Algorithm
static string	BuildParamVectKey (const std::string &comm_name, unsigned int i)
static string	BuildParamVectSizeKey (const std::string &comm_name)
Protected Member Functions inherited from genie::XSecAlgorithmI
	XSecAlgorithmI ()
	XSecAlgorithmI (string name)
	XSecAlgorithmI (string name, string config)
Protected Member Functions inherited from genie::Algorithm
	Algorithm ()
	Algorithm (string name)
	Algorithm (string name, string config)
void	Initialize (void)
void	DeleteConfig (void)
void	DeleteSubstructure (void)
Registry *	ExtractLocalConfig (const Registry &in) const
Registry *	ExtractLowerConfig (const Registry &in, const string &alg_key) const
	Split an incoming configuration Registry into a block valid for the sub-algo identified by alg_key. More...
template<class T >
bool	GetParam (const RgKey &name, T &p, bool is_top_call=true) const
template<class T >
bool	GetParamDef (const RgKey &name, T &p, const T &def) const
template<class T >
int	GetParamVect (const std::string &comm_name, std::vector< T > &v, bool is_top_call=true) const
	Handle to load vectors of parameters. More...
int	GetParamVectKeys (const std::string &comm_name, std::vector< RgKey > &k, bool is_top_call=true) const
int	AddTopRegistry (Registry *rp, bool owns=true)
	add registry with top priority, also update ownership More...
int	AddLowRegistry (Registry *rp, bool owns=true)
	add registry with lowest priority, also update ownership More...
int	MergeTopRegistry (const Registry &r)
int	AddTopRegisties (const vector< Registry * > &rs, bool owns=false)
	Add registries with top priority, also udated Ownerships. More...
Protected Attributes inherited from genie::Algorithm
bool	fAllowReconfig
bool	fOwnsSubstruc
	true if it owns its substructure (sub-algs,...) More...
AlgId	fID
	algorithm name and configuration set More...
vector< Registry * >	fConfVect
vector< bool >	fOwnerships
	ownership for every registry in fConfVect More...
AlgStatus_t	fStatus
	algorithm execution status More...
AlgMap *	fOwnedSubAlgMp
	local pool for owned sub-algs (taken out of the factory pool) More...

Detailed Description

Differential cross section for v+As coherent elastic scattering.Coherent DNu.
Is a concrete implementation of the XSecAlgorithmI interface.
.

E.Bertuzzo, S.Jana, P.A.N.Machado, R. Zukanovich Funcal PhysRevLett.121.241801 (2018)

Author

Author: Iker de Icaza <i.de-icaza-astiz sussex.ac.uk> University of Sussex

Costas Andreopoulos <constantinos.andreopoulos cern.ch> University of Liverpool & STFC Rutherford Appleton Laboratory

June 12, 2020

Copyright (c) 2003-2020, The GENIE Collaboration For the full text of the license visit http://copyright.genie-mc.org

Definition at line 35 of file BertuzzoDNuCOHPXSec.h.

Constructor & Destructor Documentation

BertuzzoDNuCOHPXSec::BertuzzoDNuCOHPXSec

(

)

Definition at line 34 of file BertuzzoDNuCOHPXSec.cxx.

                                         :
XSecAlgorithmI("genie::BertuzzoDNuCOHPXSec")
{

}

BertuzzoDNuCOHPXSec::BertuzzoDNuCOHPXSec

(

string

config

)

Definition at line 40 of file BertuzzoDNuCOHPXSec.cxx.

                                                      :
XSecAlgorithmI("genie::BertuzzoDNuCOHPXSec", config)
{

}

BertuzzoDNuCOHPXSec::~BertuzzoDNuCOHPXSec ( )

virtual

Definition at line 46 of file BertuzzoDNuCOHPXSec.cxx.

{

}

Member Function Documentation

void BertuzzoDNuCOHPXSec::Configure ( const Registry &  config )

overridevirtual

Configure the algorithm with an external registry The registry is merged with the top level registry if it is owned, Otherwise a copy of it is added with the highest priority

Reimplemented from genie::Algorithm.

Definition at line 148 of file BertuzzoDNuCOHPXSec.cxx.

{
  Algorithm::Configure(config);
  this->LoadConfig();
}

void BertuzzoDNuCOHPXSec::Configure ( string  config )

overridevirtual

Configure the algorithm from the AlgoConfigPool based on param_set string given in input An algorithm contains a vector of registries coming from different xml configuration files, which are loaded according a very precise prioriy This methods will load a number registries in order of priority: 1) "Tunable" parameter set from CommonParametes. This is loaded with the highest prioriry and it is designed to be used for tuning procedure Usage not expected from the user. 2) For every string defined in "CommonParame" the corresponding parameter set will be loaded from CommonParameter.xml 3) parameter set specified by the config string and defined in the xml file of the algorithm 4) if config is not "Default" also the Default parameter set from the same xml file will be loaded Effectively this avoids the repetion of a parameter when it is not changed in the requested configuration

Reimplemented from genie::Algorithm.

Definition at line 154 of file BertuzzoDNuCOHPXSec.cxx.

{
  Algorithm::Configure(config);
  this->LoadConfig();
}

double BertuzzoDNuCOHPXSec::Integral ( const Interaction *  i ) const

overridevirtual

Integrate the model over the kinematic phase space available to the input interaction (kinematical cuts can be included)

Implements genie::XSecAlgorithmI.

Definition at line 105 of file BertuzzoDNuCOHPXSec.cxx.

{
  double xsec = fXSecIntegrator->Integrate(this,interaction);
  return xsec;
}

void BertuzzoDNuCOHPXSec::LoadConfig ( void  )

private

Definition at line 160 of file BertuzzoDNuCOHPXSec.cxx.

{

  bool good_configuration = true ;

  double DKineticMixing = 0.;
  this->GetParam("Dark-KineticMixing", DKineticMixing);
  fEps2 = DKineticMixing * DKineticMixing;

  bool force_unitarity = false ;
  GetParam( "Dark-Mixing-ForceUnitarity", force_unitarity ) ;

  unsigned int n_min_mixing = force_unitarity ? 3 : 4 ;

  std::vector<double> DMixing2s;  // |U_{\alpha 4}|^2
  this->GetParamVect("Dark-Mixings2", DMixing2s);

  // check whether we have enough mixing elements
  if ( DMixing2s.size () < n_min_mixing ) {
    good_configuration = false ;
    LOG("BertuzzoDNuCOH", pERROR )
      << "Not enough mixing elements specified, only specified "
      << DMixing2s.size() << " / " << n_min_mixing ;
  }

  double tot_mix = 0.;
  for( unsigned int i = 0; i < n_min_mixing ; ++i ) {
    if ( DMixing2s[i] < 0. ) {
      good_configuration = false ;
      LOG("BertuzzoDNuCOH", pERROR )
        << "Mixing " << i << " non positive: " << DMixing2s[i] ;
      continue ;
    }
    tot_mix += fMixing2s[i] = DMixing2s[i] ;
  }

  if ( force_unitarity ) {
    fMixing2s[3] = 1. - tot_mix ;
  }
  if ( DMixing2s[3] < 0. ) {
    good_configuration = false ;
    LOG("BertuzzoDNuCOH", pERROR )
      << "Mixing D4 non positive: " << DMixing2s[3] ;
  }
  
  this->GetParam("Dark-Alpha", fAlpha_D);

  fDNuMass = 0.;
  this->GetParam("Dark-NeutrinoMass", fDNuMass);
  fDNuMass2 = fDNuMass * fDNuMass;

  fDMediatorMass = 0.;
  this->GetParam("Dark-MediatorMass", fDMediatorMass);
  fDMediatorMass2 = fDMediatorMass * fDMediatorMass;

  fXSecIntegrator =
      dynamic_cast<const XSecIntegratorI *> (this->SubAlg("XSec-Integrator"));
  assert(fXSecIntegrator);
  fFF = dynamic_cast<const EngelFormFactor *> (this->SubAlg("FormFactor"));
  assert(fFF);

  if ( ! good_configuration ) {
    LOG("BertuzzoDNuCOH", pFATAL ) << "Wrong configuration. Exiting" ;
    exit ( 78 ) ;
  }

}

bool BertuzzoDNuCOHPXSec::ValidKinematics ( const Interaction *  i ) const

overridevirtual

Is the input kinematical point a physically allowed one?

Reimplemented from genie::XSecAlgorithmI.

Definition at line 128 of file BertuzzoDNuCOHPXSec.cxx.

{
  if(interaction->TestBit(kISkipKinematicChk)) return true;

  if(!interaction->PhaseSpace().IsAboveThreshold()) return false;

  const double E  = interaction->InitState().ProbeE(kRfLab);
  const double M = interaction->InitState().Tgt().Mass();
  const TLorentzVector& DNu = interaction->Kine().FSLeptonP4();

  const double tl = DNu.E()*(M+E) - E*M - 0.5*fDNuMass2;
  const double tr = E * DNu.P();

  if(tl < -1.*tr) return false;
  if(tl >  tr) return false;

  return true;

}

bool BertuzzoDNuCOHPXSec::ValidProcess ( const Interaction *  i ) const

overridevirtual

Can this cross section algorithm handle the input process?

Implements genie::XSecAlgorithmI.

Definition at line 111 of file BertuzzoDNuCOHPXSec.cxx.

{
  if(interaction->TestBit(kISkipProcessChk)) return true;

  const ProcessInfo & proc_info = interaction->ProcInfo();
  if ( ! proc_info.IsCoherentElastic() ) return false;
  if ( ! proc_info.IsDarkNeutralCurrent() ) return false ;

  const InitialState & init_state = interaction->InitState();
  if ( ! pdg::IsNeutrino( TMath::Abs( init_state.ProbePdg() ) ) ) return false ;

  const Target & target = init_state.Tgt();
  if( ! target.IsNucleus() ) return false ;

  return true;
}

double BertuzzoDNuCOHPXSec::XSec ( const Interaction *  i, KinePhaseSpace_t  k  ) const

overridevirtual

Compute the cross section for the input interaction.

Implements genie::XSecAlgorithmI.

Definition at line 51 of file BertuzzoDNuCOHPXSec.cxx.

{
  if(! this -> ValidProcess    (interaction) ) return 0.;
  if(! this -> ValidKinematics (interaction) ) return 0.;

  const InitialState & init_state = interaction -> InitState();
  const Kinematics &   kinematics = interaction -> Kine();
  const Target &       target     = init_state.Tgt();

  // User inputs to the calculation
  const int nu_pdg = init_state.ProbePdg();
  const double E  = init_state.ProbeE(kRfLab); // neutrino energy, units: GeV
  const double Q2 = kinematics.Q2(); // momentum transfer, units: GeV^2
  const double TE =  kinematics.HadSystP4().E(); // energy of the target
  const unsigned int Z = target.Z(); // number of protons

  // select the mixing depending on the incoming neutrino
  unsigned short nu_i = 3;
  if( pdg::IsNuE( TMath::Abs( nu_pdg ) ) ) nu_i = 0;
  else if ( pdg::IsNuMu( TMath::Abs( nu_pdg ) ) ) nu_i = 1;
  else if ( pdg::IsNuTau( TMath::Abs( nu_pdg ) ) ) nu_i = 2;
  const double DTheta2 = fMixing2s[nu_i] * fMixing2s[3] ;

  // Target atomic mass number and mass calculated from inputs
  const double M = target.Mass(); // units: GeV

  const double FF = fFF->FormFactor(Q2, target);
  const double TT = TE - M;

  // auxiliary variables
  const double E2  = E * E;
  const double Z2 = Z * Z;
  const double FF2 = FF * FF;
  const double TTDiff = TT - M;

  const double const_factor = 2* constants::kPi * constants::kAem ;
  const double model_params = fEps2 * DTheta2 * fAlpha_D ;

  const double num_fact1 = FF2 * Z2;
  const double num_fact21 = fDNuMass2 * (TTDiff - 2.*E);
  const double num_fact22 = 2. * M * (2.*E2 - 2.*TT*E + TT*TTDiff);
  const double den_fact1 = 1. / (E2);
  const double den_fact2 = TMath::Power((fDMediatorMass2 + 2.*TT*M), -2.);

  if(kps == kPSEDNufE) {
    const double xsec = const_factor * model_params * num_fact1 *
      (num_fact21 + num_fact22) * den_fact1 * den_fact2;

    return xsec;
  }
  return 0.;
}

Member Data Documentation

double genie::BertuzzoDNuCOHPXSec::fAlpha_D

private

Definition at line 66 of file BertuzzoDNuCOHPXSec.h.

double genie::BertuzzoDNuCOHPXSec::fDMediatorMass

private

Definition at line 69 of file BertuzzoDNuCOHPXSec.h.

double genie::BertuzzoDNuCOHPXSec::fDMediatorMass2

private

Definition at line 69 of file BertuzzoDNuCOHPXSec.h.

double genie::BertuzzoDNuCOHPXSec::fDNuMass

private

Definition at line 68 of file BertuzzoDNuCOHPXSec.h.

double genie::BertuzzoDNuCOHPXSec::fDNuMass2

private

Definition at line 68 of file BertuzzoDNuCOHPXSec.h.

double genie::BertuzzoDNuCOHPXSec::fEps2

private

Definition at line 60 of file BertuzzoDNuCOHPXSec.h.

const EngelFormFactor* genie::BertuzzoDNuCOHPXSec::fFF

private

Engel Form Factor algorithm.

Definition at line 58 of file BertuzzoDNuCOHPXSec.h.

std::array<double, 4> genie::BertuzzoDNuCOHPXSec::fMixing2s

private

Definition at line 62 of file BertuzzoDNuCOHPXSec.h.

const XSecIntegratorI* genie::BertuzzoDNuCOHPXSec::fXSecIntegrator

private

cross section integrator

Definition at line 57 of file BertuzzoDNuCOHPXSec.h.

---

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

• Generator/src/Physics/DarkNeutrino/XSection/BertuzzoDNuCOHPXSec.h
• Generator/src/Physics/DarkNeutrino/XSection/BertuzzoDNuCOHPXSec.cxx