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PYTHIA
8.312
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#include <PartonDistributions.h>
Public Member Functions | |
| CJKL (int idBeamIn=22, Rndm *rndmPtrIn=0) | |
| Constructor. Needs the randon number generator to sample valence content. | |
| double | gammaPDFxDependence (int id, double) override |
| Functions to approximate pdfs for ISR. More... | |
| double | gammaPDFRefScale (int) override |
| int | sampleGammaValFlavor (double Q2) override |
| Set the valence content for photons. More... | |
| double | xfIntegratedTotal (double Q2) override |
| The total x-integrated PDFs. Relevant for MPIs with photon beams. More... | |
 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 | 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 |
Gives the CJKL leading order parton distribution function set in parametrized form for the real photons. Authors: F.Cornet, P.Jankowski, M.Krawczyk and A.Lorca, Phys. Rev. D68: 014010, 2003.
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overridevirtual |
Returns the reference scale for the logarithmic scale dependence to approximate the PDFs in ISR. Mass squared for heavy quarks and 0.2 for others.
Reimplemented from PDF.
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overridevirtual |
Functions to approximate pdfs for ISR.
Returns the x-dependence decoupled from the logarithmic scale dependence to approximate the PDFs from below for ISR. Currently flat in x (no second argument), could be improved.
Reimplemented from PDF.
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overridevirtual |
Set the valence content for photons.
Set valence content of the photon beam using parametrized Q2-dependence.
Freeze the scale below the initial scale.
Calculate the x-integrated valence part of hadron-like contribution.
Set the reference scales and charges.
For u- and d-quarks valence contribution from hadron-like part.
Normalization of the point-like part.
Logarithmic Q^2 evolution of gamma -> qqbar splitting for each flavor.
Sample the valence flavor.
Reimplemented from PDF.
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overridevirtual |
The total x-integrated PDFs. Relevant for MPIs with photon beams.
Sum of integrated PDFs dx x f(x,Q^2) at given scale Q^2. Integrals parametrized as a0 + a1*log(Q^2/Q0^2).
Freeze the scale below the initial scale.
Set the reference scales and relative contributions. Gluons and u/d quarks has some non-perturbative contribution, others only radiative contributions. Derived by fitting by eye to a0 + a1*log(Q^2/Q0^2).
Logarithmic Q^2 evolution for each flavor. quarks two times, gluon coefficents scaled appropriately.
Reimplemented from PDF.
1.8.11
