Computes DMDIS differential cross sections. Is a concrete implementation of the XSecAlgorithmI interface. More...

#include <QPMDMDISPXSec.h>

Inheritance diagram for genie::QPMDMDISPXSec:

Public Member Functions
	QPMDMDISPXSec ()

	QPMDMDISPXSec (string config)

virtual	~QPMDMDISPXSec ()

double	XSec (const Interaction *i, KinePhaseSpace_t k) const
	Compute the cross section for the input interaction. More...

double	Integral (const Interaction *i) const

bool	ValidProcess (const Interaction *i) const
	Can this cross section algorithm handle the input process? More...

void	Configure (const Registry &config)

void	Configure (string config)

Public Member Functions inherited from genie::XSecAlgorithmI
virtual	~XSecAlgorithmI ()

virtual bool	ValidKinematics (const Interaction *i) const
	Is the input kinematical point a physically allowed one? More...

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)

double	DMDISRESJoinSuppressionFactor (const Interaction *in) const

Private Attributes
DISStructureFunc	fDISSF

bool	fInInitPhase

const DISStructureFuncModelI *	fDISSFModel
	SF model. More...

const HadronizationModelI *	fHadronizationModel
	hadronic multip. model More...

const XSecIntegratorI *	fXSecIntegrator
	diff. xsec integrator More...

const XSecAlgorithmI *	fCharmProdModel

bool	fUsingDisResJoin
	use a DMDIS/RES joining scheme? More...

bool	fUseCache
	cache reduction factors used in joining scheme More...

double	fWcut
	apply DMDIS/RES joining scheme < Wcut More...

double	fScale
	cross section scaling factor More...

double	fSin48w
	sin^4(Weingberg angle) More...

int	fVelMode
	velcoity dependence for xsec More...

double	fMedMass
	Mediator mass. More...

double	fgzp
	Coupling to the mediator Zprime. More...

double	fQchiL
	Left-handed DM charge. More...

double	fQchiR
	Right-handed DM charge. More...

double	fQchiS
	Scalar DM charge. More...

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

Computes DMDIS differential cross sections. Is a concrete implementation of the XSecAlgorithmI interface.

E.A.Paschos and J.Y.Yu, Phys.Rev.D 65.03300

Author: Joshua Berger <jberger physics.wisc.edu University of Wisconsin-Madison

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

September 4, 2017

Definition at line 37 of file QPMDMDISPXSec.h.

Constructor & Destructor Documentation

QPMDMDISPXSec::QPMDMDISPXSec ( )

Definition at line 49 of file QPMDMDISPXSec.cxx.

                              :
 XSecAlgorithmI("genie::QPMDMDISPXSec")
 {
   fInInitPhase = true;
 }

QPMDMDISPXSec::QPMDMDISPXSec ( string config )

Definition at line 55 of file QPMDMDISPXSec.cxx.

                                           :
 XSecAlgorithmI("genie::QPMDMDISPXSec", config)
 {
   fInInitPhase = true;
 }

QPMDMDISPXSec::~QPMDMDISPXSec ( )

virtual

Definition at line 61 of file QPMDMDISPXSec.cxx.

 {
 
 }

Member Function Documentation

void QPMDMDISPXSec::Configure ( const Registry & config )

virtual

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 249 of file QPMDMDISPXSec.cxx.

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

void QPMDMDISPXSec::Configure ( string config )

virtual

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 255 of file QPMDMDISPXSec.cxx.

 {
   Algorithm::Configure(config);
 
   Registry r( "QPMDMDISPXSec_specific", false ) ;
 
   RgKey xdefkey = "XSecModel@genie::EventGenerator/DIS-CC-CHARM";
   RgKey local_key = "CharmXSec" ;
   r.Set( local_key, AlgConfigPool::Instance() -> GlobalParameterList() -> GetAlg(xdefkey) ) ;
 
   Algorithm::Configure(r) ;
 
   this->LoadConfig();
 }

double genie::QPMDMDISPXSec::DMDISRESJoinSuppressionFactor ( const Interaction * in ) const

private

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

virtual

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

Implements genie::XSecAlgorithmI.

Definition at line 224 of file QPMDMDISPXSec.cxx.

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

void QPMDMDISPXSec::LoadConfig ( void )

private

Definition at line 270 of file QPMDMDISPXSec.cxx.

 {
   // Access global defaults to use in case of missing parameters
 
   fDISSFModel = 0;
   fDISSFModel = 
      dynamic_cast<const DISStructureFuncModelI *> (this->SubAlg("SFAlg"));
   assert(fDISSFModel);
 
   fDISSF.SetModel(fDISSFModel); // <-- attach algorithm
 
   // Cross section scaling factor
   this->GetParam( "DIS-XSecScale", fScale ) ;
 
   // sin^4(theta_weinberg)
   double thw  ;
   this->GetParam( "WeinbergAngle", thw ) ;
   fSin48w = TMath::Power( TMath::Sin(thw), 4 );
 
   // Caching the reduction factors used in the DMDIS/RES joing scheme?
   // In normal event generation (1 config -> many calls) it is worth caching
   // these suppression factors.
   // Depending on the way this algorithm is used during event reweighting,
   // precomputing (for all W's) & caching these factors might not be efficient.
   // Here we provide the option to turn the caching off at run-time (default: on)
 
   bool cache_enabled = RunOpt::Instance()->BareXSecPreCalc();
 
   this->GetParamDef( "UseCache", fUseCache, true ) ;
   fUseCache = fUseCache && cache_enabled;
 
   // Since this method would be called every time the current algorithm is 
   // reconfigured at run-time, remove all the data cached by this algorithm
   // since they depend on the previous configuration
 
   if(!fInInitPhase) {
      Cache * cache = Cache::Instance();
      string keysubstr = this->Id().Key() + "/DMDIS-RES-Join";
      cache->RmMatchedCacheBranches(keysubstr);
   }
   fInInitPhase = false;
 
   // velocity dependence of the interaction
   this->GetParamDef("velocity-mode", fVelMode, 0);
 
   // mediator coupling
   this->GetParam("ZpCoupling", fgzp);
   this->GetParam("DarkLeftCharge", fQchiL);
   this->GetParam("DarkRightCharge", fQchiR);
   this->GetParam("DarkScalarCharge", fQchiS);
 
   // mediator mass ratio and mediator mass
   fMedMass = PDGLibrary::Instance()->Find(kPdgMediator)->Mass();
   
   //-- load the differential cross section integrator
   fXSecIntegrator =
       dynamic_cast<const XSecIntegratorI *> (this->SubAlg("XSec-Integrator"));
   assert(fXSecIntegrator);
 
   RgKey local_key = "CharmXSec" ;
   RgAlg xalg ;
   GetParam( local_key, xalg) ;
   LOG("DMDISXSec", pDEBUG)
      << "Loading the cross section model: " << xalg;
   fCharmProdModel = dynamic_cast<const XSecAlgorithmI *> ( this -> SubAlg(local_key) ) ;
   assert(fCharmProdModel);
 }

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

virtual

Can this cross section algorithm handle the input process?

Implements genie::XSecAlgorithmI.

Definition at line 230 of file QPMDMDISPXSec.cxx.

 {
   if(interaction->TestBit(kISkipProcessChk)) return true;
 
   const ProcessInfo & proc_info  = interaction->ProcInfo();
   if(!proc_info.IsDarkMatterDeepInelastic()) return false;
 
   const InitialState & init_state = interaction -> InitState();
   int probe_pdg = init_state.ProbePdg();
   if(!pdg::IsDarkMatter(probe_pdg) && !pdg::IsAntiDarkMatter(probe_pdg)) return false;
 
   if(! init_state.Tgt().HitNucIsSet()) return false;
 
   int hitnuc_pdg = init_state.Tgt().HitNucPdg();
   if(!pdg::IsNeutronOrProton(hitnuc_pdg)) return false;
 
   return true;
 }

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

virtual

Compute the cross section for the input interaction.

Implements genie::XSecAlgorithmI.

Definition at line 66 of file QPMDMDISPXSec.cxx.

 {
   if(! this -> ValidProcess    (interaction) ) return 0.;
   if(! this -> ValidKinematics (interaction) ) return 0.;
 
   // Get kinematical & init-state parameters
   const Kinematics &   kinematics = interaction -> Kine();
   const InitialState & init_state = interaction -> InitState();
   const ProcessInfo &  proc_info  = interaction -> ProcInfo(); // comment-out unused variable to eliminate warnings
 
   LOG("DMDISPXSec", pDEBUG) << "Using v^" << fVelMode << " dependence";
   
   double E     = init_state.ProbeE(kRfHitNucRest);
   double ml    = interaction->FSPrimLepton()->Mass();
   double Mnuc  = init_state.Tgt().HitNucMass();
   double x     = kinematics.x();
   double y     = kinematics.y();
 
   double E2    = E    * E;
   double ml2   = ml   * ml;
   // double ml4   = ml2  * ml2; // comment-out unused variable to eliminate warnings
   // double Mnuc2 = Mnuc * Mnuc; // comment-out unused variable to eliminate warnings
 
 #ifdef __GENIE_LOW_LEVEL_MESG_ENABLED__
   LOG("DMDISPXSec", pDEBUG)  
    << "Computing d2xsec/dxdy @ E = " << E << ", x = " << x << ", y = " << y;
 #endif
 
   // One of the xsec terms changes sign for antineutrinos @ DMDIS/CC
 
   // bool is_nubar_cc = pdg::IsAntiNeutrino(init_state.ProbePdg()) && 
   //                    proc_info.IsWeakCC(); // // comment-out unused variable to eliminate warnings
   // int sign = (is_nubar_cc) ? -1 : 1; // comment-out unused variable to eliminate warnings
   int sign = 1;
   if ( pdg::IsAntiDarkMatter(init_state.ProbePdg()) ) sign = -1;
   
   // Calculate the DMDIS structure functions
   fDISSF.Calculate(interaction); 
 
 #ifdef __GENIE_LOW_LEVEL_MESG_ENABLED__
   LOG("DMDISPXSec", pDEBUG) << fDISSF;
 #endif
 
   //
   // Compute the differential cross section
   //
 
   // For EM interaction replace  G_{Fermi} with :
   // a_{em} * pi / ( sqrt(2) * sin^2(theta_weinberg) * Mass_{W}^2 }
   // See C.Quigg, Gauge Theories of the Strong, Weak and E/M Interactions,
   // ISBN 0-8053-6021-2, p.112 (6.3.57)
   // Also, take int account that the photon propagator is 1/p^2 but the
   // W propagator is 1/(p^2-Mass_{W}^2), so weight the EM case with
   // Mass_{W}^4 / q^4
   // So, overall:
   // G_{Fermi}^2 --> a_{em}^2 * pi^2 / (2 * sin^4(theta_weinberg) * q^{4})
   //
   double Q2 = utils::kinematics::XYtoQ2(E,Mnuc,x,y);
   // double Q4 = Q2*Q2; // comment-out unused variable to eliminate warnings
   // temp: set the Z' mass to MZ and g' = 1 for now
   LOG("DMDISPXSec", pDEBUG)
     << "Using a mediator mass " << fMedMass;
   double Mzp2 = TMath::Power(fMedMass,2);
   // double gzp = RunOpt::Instance()->ZpCoupling();
   double gzp = fgzp;
   double gzp4 = TMath::Power(gzp,4);
   double g2 = gzp4 / TMath::Power((Q2 + Mzp2), 2);
   double p2 = TMath::Max(E2 - ml2,0.);
   double front_factor = (g2*Mnuc*E) / (64.0 * kPi) * (E2 / p2);
   
   // Build all dxsec/dxdy terms
   double term1 = 0.;
   double term2 = 0.;
   double term3 = 0.;
   double term4 = 0.;
   double term5 = 0.;
   // The cross-check of these expressions is that they should
   // give the elastic cross-section in the limit x -> 1, PDF -> 1,
   // and absent nuclear effects
   if (fVelMode == 0) {
     // Second lines contain longitudinal Z' coupling
     // If the mediator is relatively light, these terms are important
     // and can't be neglected like they are in the SM
     double QchiV2 = TMath::Power(0.5*(fQchiL + fQchiR),2);
     double QchiA2 = TMath::Power(0.5*(fQchiL - fQchiR),2);
     double QchiVA = TMath::Power(0.5*fQchiL,2) - TMath::Power(0.5*fQchiR,2);
     double LongF = TMath::Power(1.0 + 2.0 * x * y * Mnuc * E / Mzp2,2);
     term1  = 8.0 * y * ((QchiV2 + QchiA2) * x * y - (QchiV2 - (2.0 + LongF) * QchiA2) * ml2 / (E * Mnuc));
     term2  = 4.0 * (2.0 * (QchiV2 + QchiA2) * (1.0 - y - 0.5 * Mnuc / E * x * y) - QchiA2 * ml2 / E * (2.0 / E + y / x / Mnuc * (1.0 - LongF)));
     term3  = sign * 8.0 * (2.0 - y) * x * y * QchiVA;
     term4  = 16.0 * QchiA2 * LongF * ml2 * x * y / (E * Mnuc);
     term5  = -8.0 * QchiA2 * LongF * ml2 * y / (E * Mnuc);
   }
   else if (fVelMode == 2) {
     // Scalar case has no longitudinal Z' coupling
     double QchiS2 = TMath::Power(fQchiS, 2);
     term1 = - 4.0 * QchiS2 * y * (x * y + 2.0 * ml2/(E*Mnuc));
     term2 = 2.0 * QchiS2 * TMath::Power(y - 2.0,2);
   }  
 #ifdef __GENIE_LOW_LEVEL_MESG_ENABLED__
   LOG("DMDISPXSec", pDEBUG)  
     << "\nd2xsec/dxdy ~ (" << term1 << ")*F1+(" << term2 << ")*F2+(" 
                   << term3 << ")*F3+(" << term4 << ")*F4+(" << term5 << ")*F5";
 #endif
 
   term1 *= fDISSF.F1();
   term2 *= fDISSF.F2();
   term3 *= fDISSF.F3();
   term4 *= fDISSF.F4();
   term5 *= fDISSF.F5();
 
   LOG("DMDISPXSec", pDEBUG)  
     << "\nd2xsec/dxdy ~ (" << term1 << ")+(" << term2 << ")+(" 
                   << term3 << ")+(" << term4 << ")+(" << term5 << ")";
 
   
   double xsec = front_factor * (term1 + term2 + term3 + term4 + term5);
   xsec = TMath::Max(xsec,0.);
 
 #ifdef __GENIE_LOW_LEVEL_MESG_ENABLED__
   LOG("DMDISPXSec", pINFO)
         << "d2xsec/dxdy[FreeN] (E= " << E 
                       << ", x= " << x << ", y= " << y << ") = " << xsec;
 #endif
 
   // The algorithm computes d^2xsec/dxdy
   // Check whether variable tranformation is needed
   if(kps!=kPSxyfE) {
     double J = utils::kinematics::Jacobian(interaction,kPSxyfE,kps);
     xsec *= J;
   }
 
   // If requested return the free nucleon xsec even for input nuclear tgt 
   if( interaction->TestBit(kIAssumeFreeNucleon) ) return xsec;
 
   // Compute nuclear cross section (simple scaling here, corrections must
   // have been included in the structure functions)
   const Target & target = init_state.Tgt();
   int nucpdgc = target.HitNucPdg();
   int NNucl = (pdg::IsProton(nucpdgc)) ? target.Z() : target.N(); 
   xsec *= NNucl; 
 
   // Apply scaling / if required to reach well known asymmptotic value
   xsec *= fScale;
 
   // Subtract the inclusive charm production cross section
   interaction->ExclTagPtr()->SetCharm();
   double xsec_charm = fCharmProdModel->XSec(interaction,kps);
   interaction->ExclTagPtr()->UnsetCharm();
 #ifdef __GENIE_LOW_LEVEL_MESG_ENABLED__
   LOG("DMDISPXSec", pINFO) 
        << "Subtracting charm piece: " << xsec_charm << " / out of " << xsec;
 #endif
   xsec = TMath::Max(0., xsec-xsec_charm);
   return xsec;
 }

Member Data Documentation

const XSecAlgorithmI* genie::QPMDMDISPXSec::fCharmProdModel

private

Definition at line 65 of file QPMDMDISPXSec.h.

DISStructureFunc genie::QPMDMDISPXSec::fDISSF

mutableprivate

Definition at line 58 of file QPMDMDISPXSec.h.

const DISStructureFuncModelI* genie::QPMDMDISPXSec::fDISSFModel

private

SF model.

Definition at line 61 of file QPMDMDISPXSec.h.

double genie::QPMDMDISPXSec::fgzp

private

Coupling to the mediator Zprime.

Definition at line 74 of file QPMDMDISPXSec.h.

const HadronizationModelI* genie::QPMDMDISPXSec::fHadronizationModel

private

hadronic multip. model

Definition at line 62 of file QPMDMDISPXSec.h.

bool genie::QPMDMDISPXSec::fInInitPhase

private

Definition at line 59 of file QPMDMDISPXSec.h.

double genie::QPMDMDISPXSec::fMedMass

private

Mediator mass.

Definition at line 73 of file QPMDMDISPXSec.h.

double genie::QPMDMDISPXSec::fQchiL

private

Left-handed DM charge.

Definition at line 75 of file QPMDMDISPXSec.h.

double genie::QPMDMDISPXSec::fQchiR

private

Right-handed DM charge.

Definition at line 76 of file QPMDMDISPXSec.h.

double genie::QPMDMDISPXSec::fQchiS

private

Scalar DM charge.

Definition at line 77 of file QPMDMDISPXSec.h.

double genie::QPMDMDISPXSec::fScale

private

cross section scaling factor

Definition at line 70 of file QPMDMDISPXSec.h.

double genie::QPMDMDISPXSec::fSin48w

private

sin^4(Weingberg angle)

Definition at line 71 of file QPMDMDISPXSec.h.

bool genie::QPMDMDISPXSec::fUseCache

private

cache reduction factors used in joining scheme

Definition at line 68 of file QPMDMDISPXSec.h.

bool genie::QPMDMDISPXSec::fUsingDisResJoin

private

use a DMDIS/RES joining scheme?

Definition at line 67 of file QPMDMDISPXSec.h.

int genie::QPMDMDISPXSec::fVelMode

private

velcoity dependence for xsec

Definition at line 72 of file QPMDMDISPXSec.h.

double genie::QPMDMDISPXSec::fWcut

private

apply DMDIS/RES joining scheme < Wcut

Definition at line 69 of file QPMDMDISPXSec.h.

const XSecIntegratorI* genie::QPMDMDISPXSec::fXSecIntegrator

private

diff. xsec integrator

Definition at line 63 of file QPMDMDISPXSec.h.

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

Generator/src/Physics/BoostedDarkMatter/XSection/QPMDMDISPXSec.h
Generator/src/Physics/BoostedDarkMatter/XSection/QPMDMDISPXSec.cxx

Public Member Functions

Private Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation