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PYTHIA
8.312
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Nuclear modifications from EPPS16 fit. More...
#include <PartonDistributions.h>
Public Member Functions | |
| EPPS16 (int idBeamIn=2212, int iSetIn=1, string pdfdataPath="../share/Pythia8/pdfdata/", PDFPtr protonPDFPtrIn=0, Logger *loggerPtrIn=0) | |
| Constructor. | |
| void | rUpdate (int id, double x, double Q2) override |
| Update parton densities. More... | |
| void | setErrorSet (int iSetIn) |
| Use other than central set to study uncertainties. | |
 Public Member Functions inherited from nPDF | |
| nPDF (int idBeamIn=2212, PDFPtr protonPDFPtrIn=0) | |
| Constructor. | |
| void | xfUpdate (int id, double x, double Q2) override |
| Update parton densities. More... | |
| void | initNPDF (int idBeamIn, PDFPtr protonPDFPtrIn=0) |
| Initialize the nPDF-related members. More... | |
| int | getA () |
| Return the number of protons and nucleons. | |
| int | getZ () |
| void | setMode (double zaIn) |
| void | resetMode () |
| Public Member Functions inherited from PDF | |
| PDF (int idBeamIn=2212) | |
| Constructor. | |
| virtual | ~PDF () |
| Virtual destructor. | |
| virtual bool | init (int, string, int, Logger *) |
| 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) |
| virtual void | setExtrapolate (bool) |
| Allow extrapolation beyond boundaries. This is optional. | |
| 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 bool | insideBounds (double, double) |
| Check whether x and Q2 values fall inside the fit bounds (LHAPDF6 only). | |
| virtual double | alphaS (double) |
| Access the running alpha_s of a PDF set (LHAPDF6 only). | |
| virtual double | mQuarkPDF (int) |
| Return quark masses used in the PDF fit (LHAPDF6 only). | |
| virtual int | nMembers () |
| Return number of members of this PDF family (LHAPDF6 only). | |
| virtual void | calcPDFEnvelope (int, double, double, int) |
| Calculate PDF envelope. | |
| virtual void | calcPDFEnvelope (pair< int, int >, pair< double, double >, double, int) |
| virtual PDFEnvelope | getPDFEnvelope () |
| 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 nPDF | |
| double | ruv |
| double | rdv |
| double | ru |
| double | rd |
| double | rs |
| double | rc |
| double | rb |
| double | rg |
| 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 |
Nuclear modifications from EPPS16 fit.
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overridevirtual |
Update parton densities.
Interpolation from the grid.
Freeze the x and Q2 values if outside the grid.
Do not use the points at mass threshold for interpolation.
Calculate the position in log(log Q^2) grid.
Set the Q2 index to interval [1,...,28].
Calculate the position in x grid.
Set the x-index interval.
Interpolate the grid values.
Do not use the last grid points for interpolation.
Calculate the four nearest points in x grid.
Reject point Q=1.3 GeV from interpoilation for charm.
Reject points Q<4.75 GeV from interpoilation for bottom.
Calculate the three nearest points in log(log Q^2) grid.
Grid points used for interpolation.
Read in the relevant values from table and interpolate in x.
Interpolate in Q2.
Save the values, for b non-zero only above the mass threshold.
Revert back to original interpolation points.
Implements nPDF.
1.8.11
