An ABC that caches resonance neutrinoproduction cross sections on free nucleons according to the Rein-Sehgal model. This significantly speeds the cross section calculation for multiple nuclear targets (eg at the spline construction phase) More...

#include <ReinSehgalRESXSecWithCache.h>

Inheritance diagram for genie::ReinSehgalRESXSecWithCache:

Protected Member Functions
	ReinSehgalRESXSecWithCache ()

	ReinSehgalRESXSecWithCache (string name)

	ReinSehgalRESXSecWithCache (string name, string config)

virtual	~ReinSehgalRESXSecWithCache ()

void	CacheResExcitationXSec (const Interaction *interaction) const

string	CacheBranchName (Resonance_t r, InteractionType_t it, int nu, int nuc) const

Protected Member Functions inherited from genie::XSecIntegratorI
	XSecIntegratorI ()

	XSecIntegratorI (string name)

	XSecIntegratorI (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
bool	fUsingDisResJoin

double	fWcut

double	fEMax

const XSecAlgorithmI *	fSingleResXSecModel

BaryonResList	fResList

Protected Attributes inherited from genie::XSecIntegratorI
const IntegratorI *	fIntegrator
	GENIE numerical integrator. More...

string	fGSLIntgType
	name of GSL numerical integrator More...

double	fGSLRelTol
	required relative tolerance (error) More...

int	fGSLMaxEval
	GSL max evaluations. More...

int	fGSLMinEval
	GSL min evaluations. Ignored by some integrators. More...

unsigned int	fGSLMaxSizeOfSubintervals
	GSL maximum number of sub-intervals for 1D integrator. More...

unsigned int	fGSLRule
	GSL Gauss-Kronrod integration rule (only for GSL 1D adaptive type) 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...

Additional Inherited Members
Public Member Functions inherited from genie::XSecIntegratorI
virtual	~XSecIntegratorI ()

virtual double	Integrate (const XSecAlgorithmI model, const Interaction interaction) const =0

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

virtual void	Configure (const Registry &config)

virtual void	Configure (string config)

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...

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)

Detailed Description

An ABC that caches resonance neutrinoproduction cross sections on free nucleons according to the Rein-Sehgal model. This significantly speeds the cross section calculation for multiple nuclear targets (eg at the spline construction phase)

D.Rein and L.M.Sehgal, Neutrino Excitation of Baryon Resonances and Single Pion Production, Ann.Phys.133, 79 (1981)

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

March 09, 2006

Definition at line 34 of file ReinSehgalRESXSecWithCache.h.

Constructor & Destructor Documentation

ReinSehgalRESXSecWithCache::ReinSehgalRESXSecWithCache ( )

protected

Definition at line 42 of file ReinSehgalRESXSecWithCache.cxx.

                                                        :
 XSecIntegratorI()
 {
 
 }

ReinSehgalRESXSecWithCache::ReinSehgalRESXSecWithCache ( string name )

protected

Definition at line 48 of file ReinSehgalRESXSecWithCache.cxx.

                                                                 :
 XSecIntegratorI(nm)
 {
 
 }

ReinSehgalRESXSecWithCache::ReinSehgalRESXSecWithCache	(	string	name,
		string	config
	)

protected

Definition at line 54 of file ReinSehgalRESXSecWithCache.cxx.

                                                                            :
 XSecIntegratorI(nm,conf)
 {
 
 }

ReinSehgalRESXSecWithCache::~ReinSehgalRESXSecWithCache ( )

protectedvirtual

Definition at line 60 of file ReinSehgalRESXSecWithCache.cxx.

 {
 
 }

Member Function Documentation

string ReinSehgalRESXSecWithCache::CacheBranchName	(	Resonance_t	r,
		InteractionType_t	it,
		int	nu,
		int	nuc
	)		const

protected

Definition at line 192 of file ReinSehgalRESXSecWithCache.cxx.

 {
 // Build a unique name for the cache branch
 
   Cache * cache = Cache::Instance();
   string res_name = utils::res::AsString(res);
   string it_name  = InteractionType::AsString(it);
   string nc_nuc   = ((nucleonpdgc==kPdgProton) ? "p" : "n");
 
   ostringstream intk;
   intk << "ResExcitationXSec/R:" << res_name << ";nu:"  << nupdgc
            << ";int:" << it_name << nc_nuc;
 
   string algkey = fSingleResXSecModel->Id().Key();
   string ikey   = intk.str();
   string key    = cache->CacheBranchKey(algkey, ikey);
 
   return key;
 }

void ReinSehgalRESXSecWithCache::CacheResExcitationXSec ( const Interaction * interaction ) const

protected

Definition at line 65 of file ReinSehgalRESXSecWithCache.cxx.

 {
 // Cache resonance neutrino production data from free nucleons
 
   Cache * cache = Cache::Instance();
 
   assert(fSingleResXSecModel);
 //  assert(fIntegrator);
 
   // Compute the number of spline knots - use at least 10 knots per decade
   // && at least 40 knots in the full energy range
   const double Emin       = 0.01;
   const int    nknots_min = (int) (10*(TMath::Log(fEMax)-TMath::Log(Emin)));
   const int    nknots     = TMath::Max(40, nknots_min);
   double * E = new double[nknots]; // knot 'x'
 
   TLorentzVector p4(0,0,0,0);
 
   int nu_code  = in->InitState().ProbePdg();
   int nuc_code = in->InitState().Tgt().HitNucPdg();
   int tgt_code = (nuc_code==kPdgProton) ? kPdgTgtFreeP : kPdgTgtFreeN;
 
   Interaction * interaction = new Interaction(*in);
   interaction->InitStatePtr()->SetPdgs(tgt_code, nu_code);
   interaction->InitStatePtr()->TgtPtr()->SetHitNucPdg(nuc_code);
 
   InteractionType_t wkcur = interaction->ProcInfo().InteractionTypeId();
   unsigned int nres = fResList.NResonances();
   for(unsigned int ires = 0; ires < nres; ires++) {
 
          // Get next resonance from the resonance list
          Resonance_t res = fResList.ResonanceId(ires);
 
          interaction->ExclTagPtr()->SetResonance(res);
 
          // Get a unique cache branch name
          string key = this->CacheBranchName(res, wkcur, nu_code, nuc_code);
 
          // Make sure the cache branch does not already exists
          CacheBranchFx * cache_branch =
              dynamic_cast<CacheBranchFx *> (cache->FindCacheBranch(key));
          assert(!cache_branch);
 
          // Create the new cache branch
          LOG("ReinSehgalResC", pNOTICE)
                         << "\n ** Creating cache branch - key = " << key;
          cache_branch = new CacheBranchFx("RES Excitation XSec");
          cache->AddCacheBranch(key, cache_branch);
          assert(cache_branch);
 
          const KPhaseSpace & kps = interaction->PhaseSpace();
          double Ethr = kps.Threshold();
          LOG("ReinSehgalResC", pNOTICE) << "E threshold = " << Ethr;
 
          // Distribute the knots in the energy range as is being done in the
          // XSecSplineList so that the energy threshold is treated correctly
          // in the spline - see comments there in.
          int nkb = (Ethr>Emin) ? 5 : 0; // number of knots <  threshold
          int nka = nknots-nkb;          // number of knots >= threshold
          // knots < energy threshold
          double dEb =  (Ethr>Emin) ? (Ethr - Emin) / nkb : 0;
          for(int i=0; i<nkb; i++) {
             E[i] = Emin + i*dEb;
          }
          // knots >= energy threshold
          double E0  = TMath::Max(Ethr,Emin);
          double dEa = (TMath::Log10(fEMax) - TMath::Log10(E0)) /(nka-1);
          for(int i=0; i<nka; i++) {
             E[i+nkb] = TMath::Power(10., TMath::Log10(E0) + i * dEa);
          }
 
          // Compute cross sections at the given set of energies
          for(int ie=0; ie<nknots; ie++) {
              double xsec = 0.;
              double Ev   = E[ie];
              p4.SetPxPyPzE(0,0,Ev,Ev);
              interaction->InitStatePtr()->SetProbeP4(p4);
 
              if(Ev>Ethr+kASmallNum) {
                // Get W integration range and the wider possible Q2 range
                // (for all W)
                Range1D_t rW  = kps.Limits(kKVW);
                Range1D_t rQ2 = kps.Limits(kKVQ2);
 
                LOG("ReinSehgalResC", pINFO)
                  << "*** Integrating d^2 XSec/dWdQ^2 for R: "
                          << utils::res::AsString(res) << " at Ev = " << Ev;
                LOG("ReinSehgalResC", pINFO)
                                 << "{W}   = " << rW.min  << ", " << rW.max;
                LOG("ReinSehgalResC", pINFO)
                                << "{Q^2} = " << rQ2.min << ", " << rQ2.max;
 
                if(rW.max<rW.min || rQ2.max<rQ2.min || rW.min<0 || rQ2.min<0) {
                   LOG("ReinSehgalResC", pINFO)
                               << "** Not allowed kinematically, xsec=0";
                } else {
 
                   ROOT::Math::IBaseFunctionMultiDim * func =
                       new utils::gsl::d2XSec_dWdQ2_E(fSingleResXSecModel, interaction);
                   ROOT::Math::IntegrationMultiDim::Type ig_type =
                       utils::gsl::IntegrationNDimTypeFromString(fGSLIntgType);
                   ROOT::Math::IntegratorMultiDim ig(ig_type,0,fGSLRelTol,fGSLMaxEval);
                   ig.SetFunction(*func);
                   double kine_min[2] = { rW.min, rQ2.min };
                   double kine_max[2] = { rW.max, rQ2.max };
                   xsec = ig.Integral(kine_min, kine_max) * (1E-38 * units::cm2);
                   delete func;
                }
              } else {
                  LOG("ReinSehgalResC", pINFO)
                        << "** Below threshold E = " << Ev << " <= " << Ethr;
              }
              cache_branch->AddValues(Ev,xsec);
              SLOG("ReinSehgalResC", pNOTICE)
                << "RES XSec (R:" << utils::res::AsString(res)
                << ", E="<< Ev << ") = "<< xsec/(1E-38 *genie::units::cm2) << " x 1E-38 cm^2";
          }//spline knots
 
          // Build the spline
          cache_branch->CreateSpline();
   }//ires
 
   delete [] E;
   delete interaction;
 }