PYTHIA  8.312
Public Member Functions | List of all members
LHAPDF6 Class Reference

Provide interface to the LHAPDF6 library of parton densities. More...

#include <LHAPDF6.h>

Inheritance diagram for LHAPDF6:
PDF

Public Member Functions

 LHAPDF6 (Pythia *, Settings *settingsPtr, Logger *)
 Constructor.
 
bool init (int idBeamIn, string setName, int member, Logger *loggerPtr) override
 Initialization of PDF set. More...
 
void setExtrapolate (bool extrapolIn)
 Allow extrapolation beyond boundaries (not implemented).
 
- Public Member Functions inherited from PDF
 PDF (int idBeamIn=2212)
 Constructor.
 
virtual ~PDF ()
 Virtual destructor.
 
bool isSetup ()
 Confirm that PDF has been set up (important for LHAPDF and H1 Pomeron).
 
virtual void setBeamID (int idBeamIn)
 Switch to new beam particle identities; for similar hadrons only.
 
void resetValenceContent ()
 Set valence content. More...
 
void setValenceContent (int idVal1In, int idVal2In, int idVal3In)
 
double xf (int id, double x, double Q2)
 Read out parton density. More...
 
double xfVal (int id, double x, double Q2)
 Read out valence and sea part of parton densities. More...
 
double xfSea (int id, double x, double Q2)
 Only sea part of parton densities. More...
 
virtual double gammaPDFxDependence (int, double)
 Approximate photon PDFs by decoupling the scale and x-dependence.
 
virtual double gammaPDFRefScale (int)
 Provide the reference scale for logarithmic Q^2 evolution for photons.
 
virtual int sampleGammaValFlavor (double)
 Sample the valence content for photons.
 
virtual double xfIntegratedTotal (double)
 The total x-integrated PDFs. Relevant for MPIs with photon beams.
 
virtual double xGamma ()
 Return the sampled value for x_gamma.
 
virtual void xPom (double=-1.0)
 Keep track of pomeron momentum fraction.
 
virtual double xfFlux (int, double, double)
 Return accurate and approximated photon fluxes and PDFs.
 
virtual double xfApprox (int, double, double)
 
virtual double xfGamma (int, double, double)
 
virtual double intFluxApprox ()
 
virtual bool hasApproxGammaFlux ()
 
virtual double getXmin ()
 Return the kinematical limits and sample Q2 and x.
 
virtual double getXhadr ()
 
virtual double sampleXgamma (double)
 
virtual double sampleQ2gamma (double)
 
virtual double fluxQ2dependence (double)
 
virtual double xfMax (int id, double x, double Q2)
 Normal PDFs unless gamma inside lepton -> an overestimate for sampling.
 
virtual double xfSame (int id, double x, double Q2)
 Normal PDFs unless gamma inside lepton -> Do not sample x_gamma.
 
virtual void setVMDscale (double=1.)
 Allow for new scaling factor for VMD PDFs.
 
bool sSymmetric () const
 Return if s/sbar, c/cbar, and b/bbar PDFs are symmetric.
 
bool cSymmetric () const
 
bool bSymmetric () const
 
void sSymmetric (bool sSymmetricIn)
 Set s/sbar, c/cbar, and b/bbar PDFs symmetric.
 
void cSymmetric (bool cSymmetricIn)
 
void bSymmetric (bool bSymmetricIn)
 

Additional Inherited Members

- Protected Member Functions inherited from PDF
void printErr (string loc, string errMsg, Logger *loggerPtr=nullptr)
 Small routine for error printout, depending on loggerPtr existing or not.
 
double xfRaw (int id) const
 Get the raw stored value for the quark variable corresponding to the id. More...
 
bool isValence (int id) const
 Check whether the specified id is a valence quark.
 
- Protected Attributes inherited from PDF
int idBeam
 Store relevant quantities.
 
int idBeamAbs
 
int idSav
 
int idVal1
 
int idVal2
 
int idVal3
 
double xSav
 
double Q2Sav
 
double xu
 Stored quantities.
 
double xd
 
double xs
 
double xubar
 
double xdbar
 
double xsbar
 
double xc
 
double xb
 
double xcbar
 
double xbbar
 
double xg
 
double xlepton
 
double xgamma
 
bool isSet
 
bool isInit
 
int beamType
 
bool hasGammaInLepton
 True if a photon beam inside a lepton beam, otherwise set false.
 
bool sSymmetricSave = false
 Whether to treat flavoured PDFs as symmetric, for efficiency.
 
bool cSymmetricSave = true
 
bool bSymmetricSave = true
 

Detailed Description

Provide interface to the LHAPDF6 library of parton densities.

Member Function Documentation

bool init ( int  idBeamIn,
string  setName,
int  member,
Logger loggerPtr 
)
overridevirtual

Initialization of PDF set.

Initialize a parton density function from LHAPDF6.

Find the PDF set. Note, LHAPDF aborts if the PDF does not exist, which we avoid with this try/catch statement. Ideally, we would check with :LHAPDF::lookupLHAPDFID, but this is not thread safe.

Find the PDF member.

Save x and Q2 limits.

Store quark masses used in PDF fit.

Reimplemented from PDF.


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