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/electronPionProduction_medium_eN [ Modules ]

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NAME

module electronPionProduction_medium_eN

PURPOSE

  • Evaluates the electron nucleon -> electron p ion nucleon cross section as 5-fold differential dSigma/dOmega(final e^-) /dE(final e^-) /dOmega(pion) in the medium.
  • Fermi motion of the incoming nucleon, as well as the potentials of the in and outgoing nucleons are taken into account.
  • While the module "electronPionProduction_medium" always assumes that the incoming electron travels in z-direction, this module deals with arbitrary momenta


electronPionProduction_medium_eN/dSdO_fdE_fdO_k_med_eN [ Functions ]

[ Top ] [ electronPionProduction_medium_eN ] [ Functions ]

NAME

function dSdO_fdE_fdO_k_med_eN(eN, pionCharge, phi_k, theta_k, k, pf, processID, pionNucleonSystem)

PURPOSE

  • Evaluates the electron nucleon -> electron pion nucleon cross section as 5-fold differential dSigma/dOmega(final e^-) /dE(final e^-) /dOmega(pion).
  • This is done using the formulas which include explicitly H_mu nu L^mu nu.
  • The angles of the outgoing pion are measured relative to the momentum transfer "q"
  • Result in units of mcb/MeV=10^3 mcb/GeV=mb/GeV

INPUTS

  • type(electronNucleon_event) :: eN -- underlying electron-nucleon event
  • integer :: pionCharge -- charge of outgoing pion
  • real :: phi_k, theta_k -- pion scattering angles in units of degree
  • integer , optional:: processID -- EM=Electromagnetic (see module leptonicID for definition)
  • integer , optional:: pionNucleonSystem -- 1 = pion angles phi_k and theta_k are defined in lab, 2 = they are defined in the CM frame of the incoming nucleon and photon

RESULT

  • real ::dSigma -- dsigma/dOmega(final electron)/dE(final Electron)/dOmega(final pion)
  • real, dimension(0:3) :: pf -- outgoing nucleon 4-momentum
  • real, dimension(0:3) :: k -- outgoing pion 4-momentum