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/formfactors_A_main [ Modules ]

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NAME

module formfactors_A_main

PURPOSE

This module administrates the formfactors for gamma* N -> N pi.

USES

INPUTS

None


formfactors_A_main/getA [ Functions ]

[ Top ] [ formfactors_A_main ] [ Functions ]

NAME

function getA(pionCharge_out,nucCharge_out,thetaIn,sIn,QSquaredIn)

PURPOSE

This function returns the invariant Amplitudes A_1, ... A_6 of the MAID analysis.

INPUTS

  • real :: thetaIn ! Theta scattering angle of the pion relative to q in the CM system of the hadronic vertex
  • real :: QSquaredIn ! Q^2=-q^mu q_mu of the gamma
  • real :: sIn ! Mandelstam s of the hadronic vertex: gamma* N-> pi N
  • integer :: pionCharge_out,nucCharge_out ! charges of outgoing pion and nucleon

OUTPUT

complex, dimension(1:6) :: getA ! The complex amplitudes A_1 to A_6 in units of:

  • [GeV**-2] for A(1)
  • [GeV**-4] for A(2) and A(5)
  • [GeV**-3] for A(3), A(4) and A(5)