#include <evolutionkernel.h>
Public Types | |
| enum | { N_space, x_space, x_space_truncate_in_one_over_L } |
Static Public Member Functions | |
| static complex_d | nonsinglet (const complex_d &z, double Q1, double Q0, int eta) |
| static matrix_c | singlet (const complex_d &z, double Q1, double Q0) |
| static complex_d | nonsinglet_fixed_flavour (const complex_d &z, double Q1, double Q0, int Nf, int eta) |
| static matrix_c | singlet_fixed_flavour (const complex_d &z, double Q1, double Q0, int Nf) |
| static complex_d | nonsinglet_with_qed (const complex_d &z, double Q1, double Q0, int eta, double electric_charge) |
| static matrix_c | singlet_with_qed (const complex_d &z, double Q1, double Q0, int flag_qed=1) |
| static complex_d | nonsinglet_with_qed_fixed_flavour (const complex_d &z, double Q1, double Q0, int Nf_down, int Nf_up, int Nl, int eta, double electric_charge) |
| static matrix_c | singlet_with_qed_fixed_flavour (const complex_d &z, double Q1, double Q0, int Nf_down, int Nf_up, int Nl, int flag_qed=1) |
Static Public Attributes | |
| static int | method = evolutionkernel::N_space |
| static int | number_of_iterations = 1000 |
Detailed Description
This class implements the evolution kernels for parton distributions.
Member Function Documentation
§ nonsinglet()
Returns the evolutionkernel
![\[ E^z(Q^2,Q_0^2) \]](form_44.png)
for the non-singlet case.
If the evolution goes over flavour threshold, the evolution is split into separate pieces. For a fixed number of active flavour, the kernel is obtained from evolutionkernel::nonsinglet_fixed_flavour.
§ nonsinglet_fixed_flavour()
|
static |
The non-singlet evolution kernel for a fixed number of active flavours.
Depending on the value of evolutionkernel::method the kernel of the corresponding truncation method is returned.
§ nonsinglet_with_qed()
|
static |
Returns the evolutionkernel
for the non-singlet case with the inclusion of QED effects
If the evolution goes over flavour threshold, the evolution is split into separate pieces. For a fixed number of active flavour, the kernel is obtained from evolutionkernel::nonsinglet_with_qed_fixed_flavour.
§ nonsinglet_with_qed_fixed_flavour()
|
static |
The non-singlet evolution kernel for a fixed number of active flavours and with the inclusion of QED effects.
§ singlet()
Returns the evolutionkernel
for the singlet case.
If the evolution goes over flavour threshold, the evolution is split into separate pieces. For a fixed number of active flavour, the kernel is obtained from evolutionkernel::singlet_fixed_flavour.
§ singlet_fixed_flavour()
The singlet evolution kernel for a fixed number of active flavours.
Depending on the value of evolutionkernel::method the kernel of the corresponding truncation method is returned.
For the methods x_space and x_space_truncate_in_one_over_L no closed forms for the kernel are known and the kernel is obtained in these cases by iteration of evolution in a small intervall. This slows down performance considerably.
The method N_space is therefore the recommended one.
§ singlet_with_qed()
Returns the evolutionkernel
for the singlet case with the inclusion of QED effects
If the evolution goes over flavour threshold, the evolution is split into separate pieces. For a fixed number of active flavour, the kernel is obtained from evolutionkernel::singlet_with_qed_fixed_flavour.
The documentation for this class was generated from the following files:
