APFEL 4.8.0
A PDF evolution library in C++
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The AlphaQCD is a specialization class of the MatchedEvolution class for the computation of the QCD coupling running. More...
#include <alphaqcd.h>
Public Member Functions | |
double | MatchObject (bool const &Up, int const &nf, double const &Coup) const |
Function for the computation of the matching. | |
double | Derivative (int const &nf, double const &, double const &as) const |
Function that returns QCD function. | |
double | betaQCD (int const &pt, int const &nf) const |
Function for the computation of the single coefficients of the expansion of the QCD function. | |
Constructors | |
List of constructors. | |
AlphaQCD ()=delete | |
AlphaQCD (double const &AlphaRef, double const &MuRef, std::vector< double > const &Masses, std::vector< double > const &Thresholds, int const &pt, int const &nsteps=10) | |
AlphaQCD constructor. | |
AlphaQCD (double const &AlphaRef, double const &MuRef, std::vector< double > const &Masses, int const &pt, int const &nsteps=10) | |
AlphaQCD constructor. | |
Public Member Functions inherited from apfel::MatchedEvolution< double > | |
MatchedEvolution ()=delete | |
MatchedEvolution (double const &ObjRef, double const &MuRef, std::vector< double > const &Thresholds, int const &nsteps=10) | |
The MatchedEvolution constructor. | |
virtual | ~MatchedEvolution ()=default |
virtual double | EvolveObject (int const &nf, double const &t0, double const &t1, double const &Obj0) const |
Virtual function for the computation of the evolution. | |
double | Evaluate (double const &mu) const |
Function that returns the evolved object. | |
double | GetObjectRef () const |
Function that returns the reference value of the object. | |
double | GetMuRef () const |
Function that returns the reference scale. | |
std::vector< double > | GetThresholds () const |
Function that returns the values of the thresholds. | |
int | GetNumberOfSteps () const |
Function that returns the number of steps. | |
void | SetObjectRef (double ObjRef) |
Function that sets the reference value of the object. | |
void | SetMuRef (double const &MuRef) |
Function that sets the reference scale. | |
void | SetNumberOfSteps (int const &nsteps) |
Function that sets the number of steps of the RK algorithm. | |
Private Attributes | |
int const | _pt |
Perturbative order. | |
std::function< double(bool const &, int const &, double const &) | _MatchingConditions ) |
Matching condition functions. | |
std::function< double(int const &, double const &) | _BetaFunction ) |
Beta function. | |
Additional Inherited Members | |
Protected Attributes inherited from apfel::MatchedEvolution< double > | |
double | _ObjRef |
double | _MuRef |
double | _MuRef2 |
double | _LogMuRef2 |
std::vector< double > | _Thresholds |
int | _nsteps |
std::vector< double > | _Thresholds2 |
std::vector< double > | _LogThresholds2 |
The AlphaQCD is a specialization class of the MatchedEvolution class for the computation of the QCD coupling running.
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delete |
apfel::AlphaQCD::AlphaQCD | ( | double const & | AlphaRef, |
double const & | MuRef, | ||
std::vector< double > const & | Masses, | ||
std::vector< double > const & | Thresholds, | ||
int const & | pt, | ||
int const & | nsteps = 10 ) |
AlphaQCD constructor.
AlphaRef | the reference value of the coupling |
MuRef | the reference value of the scale |
Masses | vector of masses |
Thresholds | vector of thresholds |
pt | perturbative order |
nsteps | number of steps of the ODE solver |
apfel::AlphaQCD::AlphaQCD | ( | double const & | AlphaRef, |
double const & | MuRef, | ||
std::vector< double > const & | Masses, | ||
int const & | pt, | ||
int const & | nsteps = 10 ) |
AlphaQCD constructor.
AlphaRef | the reference value of the coupling |
MuRef | the reference value of the scale |
Masses | vector of masses |
pt | perturbative order |
nsteps | number of steps of the ODE solver |
double apfel::AlphaQCD::betaQCD | ( | int const & | pt, |
int const & | nf ) const |
Function for the computation of the single coefficients of the expansion of the QCD function.
pt | perturbative order |
nf | number of active flavours |
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virtual |
Function that returns QCD function.
nf | number of active flavours |
as | value of the coupling |
Implements apfel::MatchedEvolution< double >.
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virtual |
Function for the computation of the matching.
Up | tells whether the matching is upward or not (downward) |
nf | number of active flavours |
Coup | value of the coupling to be matched |
Implements apfel::MatchedEvolution< double >.
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private |
Beta function.
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private |
Matching condition functions.
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private |
Perturbative order.