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@TECHREPORT{Hartin:581722,
      author       = {Hartin, Anthony},
      title        = {{I}ncoherent pair background processes with full
                      polarizations at the {ILC}},
      number       = {PAC07-THPMN080},
      reportid     = {PUBDB-2023-01632, PAC07-THPMN080. EUROTEV-REPORT-2007-040},
      series       = {771824},
      pages        = {3},
      year         = {2007},
      abstract     = {Incoherent background pair production processes are studied
                      with respect to full polarizations of all states. Real
                      initial photon polarizations are obtained via a QED
                      calculation of the beamstrahlung process. Virtual photon
                      polarizations are related to the electric field of the
                      colliding bunches at the point of pair production. An
                      explicit expression for the virtual photon polarization
                      vector is developed and found to have no circular
                      polarization component. Pair polarization states are highly
                      dependent on initial state circular polarization and are
                      consequently produced almost unpolarized. The Breit-Wheeler
                      cross-section with full polarizations is calculated and
                      coded into the CAIN pair generator program. Numerical
                      evaluations of the ILC, operating with the seven proposed
                      collider parameter sets, shows that there are 10 - $20\%$
                      less low energy pairs than previously thought. Collider
                      luminosity, as calculated by CAIN, remains the same.},
      keywords     = {beam handling techniques (autogen) / electron accelerators
                      (autogen) / electron beams (autogen) / linear colliders
                      (autogen) / particle beam bunching (autogen) / photon
                      polarisation (autogen) / quantum electrodynamics (autogen) /
                      Breit-Wheeler cross-section (autogen) / CAIN pair generator
                      program (autogen) / ILC (autogen) / QED calculation
                      (autogen) / beamstrahlung process (autogen) / circular
                      polarization (autogen) / collider luminosity (autogen) /
                      colliding bunches (autogen) / electric field (autogen) /
                      electron energy (autogen) / incoherent pair background
                      processes (autogen) / photon polarizations (autogen) /
                      Equations (autogen) / Fourier transforms (autogen) / Photon
                      collider (autogen) / Physics (autogen) / Polarization
                      (autogen) / Production (autogen) / Stokes parameters
                      (autogen) / Taylor series (autogen) / Vectors (autogen)},
      cin          = {DESY(-2012)},
      cid          = {$I:(DE-H253)DESY_-2012_-20170516$},
      pnm          = {899 - ohne Topic (POF4-899)},
      pid          = {G:(DE-HGF)POF4-899},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)29},
      doi          = {10.3204/PUBDB-2023-01632},
      url          = {https://bib-pubdb1.desy.de/record/581722},
}