src/form_factor/form_factor_2p [ Modules ]
NAME
Module form_factor_2p
USAGE
use form_factor_2p
DESCRIPTION
This module contains the different form factors for two point amplitudes.
OUTPUT
It exports four functions:
* a20 -- a function to compute A^{2,0}
* a21 -- a function to compute A^{2,1}
* a22 -- a function to compute A^{2,2}
* b22 -- a function to compute B^{2,2}
Note that a2xx and b2xx are generic functions which can be called either with a
set of integers or with an integer whose bits represents the set
USES
* precision (src/module/precision_golem.f90) * generic_function_2p (src/integrals/two_point/generic_function_2p.f90) * matrice_s (src/kinematic/matrice_s.f90) * array (src/module/array.f90) * form_factor_type (src/module/form_factor_type.f90) * constante (src/module/constante.f90)
src/form_factor/form_factor_2p/a20_b [ Functions ]
NAME
Function a20_b
USAGE
type(form_factor) = a20_b(b_pin)
DESCRIPTION
This function defines the form factor A^{2,0}.
INPUTS
* b_pin -- an integer whose bits represent an array of integers of rank 1 corresponding
to the label of the propagators pinched (removed from the original set
which is in the global variable b_ref)
SIDE EFFECTS
No side effect, it uses the value of the global variables b_ref and s_mat_p
RETURN VALUE
The result returned is of the type form_factor It returns an array of three complex (type ki) corresponding to the real part, imaginary part of the coefficient in front 1/epsilon^2, the real part, imaginary part of the 1/epsilon term and the real part, imaginary part of the constant term.
EXAMPLE
src/form_factor/form_factor_2p/a20_s [ Functions ]
NAME
Function a20_s
USAGE
type(form_factor) = a20_s(set)
DESCRIPTION
This function defines the form factor A^{2,0}.
INPUTS
* set -- an array of integers of rank 1 corresponding to the label
of the propagators pinched (removed from the original set
which is in the global variable set_ref)
SIDE EFFECTS
No side effect
RETURN VALUE
The result returned is of the type form_factor It returns an array of three complex (type ki) corresponding to the real part, imaginary part of the coefficient in front 1/epsilon^2, the real part, imaginary part of the 1/epsilon term and the real part, imaginary part of the constant term.
EXAMPLE
src/form_factor/form_factor_2p/a21_b [ Functions ]
NAME
Function a21_b
USAGE
type(form_factor) = a21_b(l1,b_pin)
DESCRIPTION
This function defines the form factor A^{2,1}(l_1).
INPUTS
* l1 -- an integer corresponding to a label in the set of the three
remaining propagators
* b_pin -- an integer whose bits represent an array of integers of rank 1 corresponding
to the label of the propagators pinched (removed from the original set
which is in the global variable b_ref)
SIDE EFFECTS
No side effect, it uses the value of the global variables b_ref and s_mat_p
RETURN VALUE
The result returned is of the type form_factor It returns an array of three complex (type ki) corresponding to the real part, imaginary part of the coefficient in front 1/epsilon^2, the real part, imaginary part of the 1/epsilon term and the real part, imaginary part of the constant term.
EXAMPLE
src/form_factor/form_factor_2p/a21_s [ Functions ]
NAME
Function a21_s
USAGE
type(form_factor) = a21_s(l1,set)
DESCRIPTION
This function defines the form factor A^{2,1}(l_1).
INPUTS
* l1 -- an integer corresponding to a label in the set of the three
remaining propagators
* set -- an array of integers of rank 1 corresponding to the label
of the propagators pinched (removed from the original set
which is in the global variable set_ref)
SIDE EFFECTS
No side effect
RETURN VALUE
The result returned is of the type form_factor It returns an array of three complex (type ki) corresponding to the real part, imaginary part of the coefficient in front 1/epsilon^2, the real part, imaginary part of the 1/epsilon term and the real part, imaginary part of the constant term.
EXAMPLE
src/form_factor/form_factor_2p/a22_b [ Functions ]
NAME
Function a22_b
USAGE
type(form_factor) = a22_b(l1,l2,b_pin)
DESCRIPTION
This function defines the form factor A^{2,2}(l1,l2).
INPUTS
* l1 -- an integer corresponding to a label in the set of the three
remaining propagators
* l2 -- an integer corresponding to a label in the set of the three
remaining propagators
* b_pin -- an integer whose bits represent an array of integers of rank 1 corresponding
to the label of the propagators pinched (removed from the original set
which is in the global variable b_ref)
SIDE EFFECTS
No side effect, it uses the value of the global variables b_ref and s_mat_p
RETURN VALUE
The result returned is of the type form_factor It returns an array of three complex (type ki) corresponding to the real part, imaginary part of the coefficient in front 1/epsilon^2, the real part, imaginary part of the 1/epsilon term and the real part, imaginary part of the constant term.
EXAMPLE
src/form_factor/form_factor_2p/a22_s [ Functions ]
NAME
Function a22_s
USAGE
type(form_factor) = a22_s(l1,l2,set)
DESCRIPTION
This function defines the form factor A^{2,2}(l1,l2).
INPUTS
* l1 -- an integer corresponding to a label in the set of the three
remaining propagators
* l2 -- an integer corresponding to a label in the set of the three
remaining propagators
* set -- an array of integers of rank 1 corresponding to the label
of the propagators pinched (removed from the original set
which is in the global variable set_ref)
SIDE EFFECTS
No side effect
RETURN VALUE
The result returned is of the type form_factor It returns an array of three complex (type ki) corresponding to the real part, imaginary part of the coefficient in front 1/epsilon^2, the real part, imaginary part of the 1/epsilon term and the real part, imaginary part of the constant term.
EXAMPLE
src/form_factor/form_factor_2p/b22_b [ Functions ]
NAME
Function b22_b
USAGE
type(form_factor) = b22_b(b_pin)
DESCRIPTION
This function defines the form factor B^{2,2}.
INPUTS
* b_pin -- an integer whose bits represent an array of integers of rank 1 corresponding
to the label of the propagators pinched (removed from the original set
which is in the global variable b_ref)
SIDE EFFECTS
No side effect, it uses the value of the global variables b_ref and s_mat_p
RETURN VALUE
The result returned is of the type form_factor It returns an array of three complex (type ki) corresponding to the real part, imaginary part of the coefficient in front 1/epsilon^2, the real part, imaginary part of the 1/epsilon term and the real part, imaginary part of the constant term.
EXAMPLE
src/form_factor/form_factor_2p/b22_s [ Functions ]
NAME
Function b22_s
USAGE
type(form_factor) = b22_s(set)
DESCRIPTION
This function defines the form factor B^{2,2}.
INPUTS
* set -- an array of integers of rank 1 corresponding to the label
of the propagators pinched (removed from the original set
which is in the global variable set_ref)
SIDE EFFECTS
No side effect
RETURN VALUE
The result returned is of the type form_factor It returns an array of three complex (type ki) corresponding to the real part, imaginary part of the coefficient in front 1/epsilon^2, the real part, imaginary part of the 1/epsilon term and the real part, imaginary part of the constant term.